D7r3

UniProt ID: A0A1S4GYH9
Organism: Anopheles gambiae
Review Status: DRAFT
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Gene Description

D7r3 is a short-form salivary protein from female Anopheles gambiae mosquitoes that facilitates blood feeding by binding and sequestering host biogenic amines (serotonin, histamine, norepinephrine, and adrenaline). Like D7r1 and other short-form D7 proteins, it functions as a "kratagonist" - capturing host signaling molecules with high affinity to prevent their vasoconstrictive, platelet-aggregating, and inflammatory effects. The protein is secreted into saliva during blood feeding. D7r3 belongs to the PBP/GOBP (Pheromone/Odorant-Binding Protein) structural family but has evolved a distinct function unrelated to olfaction.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0005549 odorant binding
IEA
GO_REF:0000002
MODIFY
Summary: This annotation is based on structural family membership (PBP/GOBP family via InterPro IPR006170) but does not reflect the actual function of D7r3. The protein binds biogenic amines (serotonin, histamine, norepinephrine, adrenaline), not odorants, and has no role in olfaction.
Reason: D7r3 belongs to the PBP/GOBP structural family (InterPro IPR006170), which led to this IEA annotation. However, the D7 proteins have evolutionarily repurposed this fold for binding biogenic amines in saliva, not odorants in antennae. D7r3 is expressed exclusively in female salivary glands [PMID:11841502, PMID:9990055], not olfactory tissues. UniProt explicitly states "Binds serotonin, noradrenaline, histamine and adrenaline" [UniProt:A0A1S4GYH9, PMID:16301315]. The actual molecular functions are serotonin binding (GO:0051378) and histamine binding (GO:0051381). This is a clear case where structural homology does not predict function. The GO:0005549 definition "Binding to an odorant, any substance capable of stimulating the sense of smell" does not apply - serotonin and histamine are not odorants. Deep research on D7 family confirms "short-form D7s (including D7r1) predominantly bind biogenic amines (serotonin/5-HT, histamine, epinephrine/norepinephrine)" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
Supporting Evidence:
UniProt:A0A1S4GYH9
Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)
PMID:16301315
four of these five short D7 proteins and the D7 long form bind serotonin with high affinity, as well as histamine and norepinephrine
GO:0005576 extracellular region
IEA
GO_REF:0000044
ACCEPT
Summary: This annotation correctly reflects the subcellular localization of D7r3 as a secreted salivary protein. However, there is a more specific IDA annotation for extracellular space (GO:0005615) from PMID:17913537.
Reason: D7r3 is a secreted protein with a signal peptide (residues 1-21) [UniProt:A0A1S4GYH9]. It is released into the extracellular space (saliva) during blood feeding. The UniProt entry confirms "SUBCELLULAR LOCATION: Secreted" [UniProt:A0A1S4GYH9]. This is an appropriate CC annotation, though the more specific GO:0005615 (extracellular space) with IDA evidence from PMID:17913537 is also present.
Supporting Evidence:
UniProt:A0A1S4GYH9
SUBCELLULAR LOCATION: Secreted
GO:0042311 vasodilation
IEA
GO_REF:0000043
KEEP AS NON CORE
Summary: This annotation captures one downstream effect of D7r3's biogenic amine scavenging activity. By sequestering serotonin and norepinephrine (vasoconstrictors), D7r3 indirectly promotes vasodilation at the feeding site.
Reason: UniProt states "Exhibits vasodilating activity" [UniProt:A0A1S4GYH9, PMID:16301315]. However, this is an indirect effect - D7r3 does not directly cause vasodilation but rather prevents vasoconstriction by scavenging host vasoconstrictive amines. The primary molecular function is binding biogenic amines (kratagonism), with vasodilation being a downstream consequence. This is acceptable as a non-core BP annotation describing the physiological outcome in the host. The deep research notes "Scavenging of host amines would antagonize their vasoconstrictor, platelet-aggregating, and pain-inducing properties" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
Supporting Evidence:
UniProt:A0A1S4GYH9
Exhibits vasodilating activity (PubMed:16301315)
PMID:16301315
Scavenging of host amines would antagonize their vasoconstrictor, platelet-aggregating, and pain-inducing properties
GO:0097746 blood vessel diameter maintenance
IEA
GO_REF:0000043
MARK AS OVER ANNOTATED
Summary: This annotation is overly general. D7r3 affects blood vessel diameter indirectly by scavenging vasoconstrictive amines, but "blood vessel diameter maintenance" implies homeostatic regulation, which is not the protein's function.
Reason: GO:0097746 (blood vessel diameter maintenance) is defined as "Any process that modulates the extent or rate of blood vessel diameter change". While D7r3 does affect vascular tone by preventing vasoconstriction (through amine scavenging), calling this "maintenance" is misleading. The protein disrupts normal host vascular responses rather than maintaining them. The annotation derives from the UniProt "Vasoactive" keyword (KW-0838), but D7r3's role is specifically anti-hemostatic modulation of host physiology, not vascular homeostasis. The more accurate annotation would be vasodilation (GO:0042311) or negative regulation of vasoconstriction.
Supporting Evidence:
UniProt:A0A1S4GYH9
Inhibits histamine-, serotonin- and noradrenaline-induced smooth muscle contraction (PubMed:16301315)
GO:0005615 extracellular space
IDA
PMID:17913537
Antibody response against saliva antigens of Anopheles gambi...
ACCEPT
Summary: This annotation is well-supported by direct experimental evidence. PMID:17913537 identified D7r3 by mass spectrometry in female saliva, confirming its extracellular localization.
Reason: The IDA evidence from PMID:17913537 is based on proteomic identification of D7r3 in female Anopheles gambiae saliva. The publication states they performed "proteomic and immunoproteomic analysis of anopheles and Aedes saliva" and identified salivary antigens. UniProt cites this paper for "IDENTIFICATION BY MASS SPECTROMETRY, SUBCELLULAR LOCATION, AND TISSUE SPECIFICITY" [UniProt:A0A1S4GYH9]. This provides direct experimental evidence that D7r3 is present in the extracellular space (saliva). This is a core CC annotation.
Supporting Evidence:
PMID:17913537
A proteomic and immunoproteomic analysis of anopheles and Aedes saliva allowed for the identification of some antigens that were recognized by most of the exposed individuals
UniProt:A0A1S4GYH9
TISSUE SPECIFICITY: Female saliva (at protein level) (PubMed:17913537)
GO:0051378 serotonin binding
IDA
PMID:16301315
Function and evolution of a mosquito salivary protein family
NEW
Summary: D7r3 binds serotonin with high affinity as demonstrated by direct binding assays. This is a core molecular function that should be annotated.
Reason: UniProt confirms "Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)" [UniProt:A0A1S4GYH9]. The protein has specific binding sites for serotonin (residues 31, 59, 118, 135, 138 by similarity to Q7PNF2). This is the actual molecular function that enables kratagonism - sequestering host serotonin to prevent vasoconstriction. GO:0051378 definition "Binding to serotonin (5-hydroxytryptamine), a monoamine neurotransmitter" accurately describes this function. PMID:16301315 explicitly tested D7 short proteins and showed "four of these five short D7 proteins and the D7 long form bind serotonin with high affinity". Deep research confirms D7 short forms "bind serotonin, histamine, and catecholamines with high affinity" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
Supporting Evidence:
UniProt:A0A1S4GYH9
Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)
PMID:16301315
four of these five short D7 proteins and the D7 long form bind serotonin with high affinity, as well as histamine and norepinephrine
GO:0051381 histamine binding
IDA
PMID:16301315
Function and evolution of a mosquito salivary protein family
NEW
Summary: D7r3 binds histamine as demonstrated by direct binding assays. This is a core molecular function that should be annotated.
Reason: UniProt confirms "Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)" [UniProt:A0A1S4GYH9]. The protein has specific binding sites for histamine (residues 118, 135, 138 by similarity to Q7PNF2). This is the actual molecular function that enables sequestration of host histamine to prevent inflammation. GO:0051381 definition "Binding to histamine, a physiologically active amine" accurately describes this function. The functional assay in PMID:16301315 demonstrated "Inhibits histamine-, serotonin- and noradrenaline-induced smooth muscle contraction" [UniProt:A0A1S4GYH9]. Deep research confirms short-form D7s bind "biogenic amines (serotonin/5-HT, histamine, epinephrine/norepinephrine)" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
Supporting Evidence:
UniProt:A0A1S4GYH9
Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)
PMID:16301315
four of these five short D7 proteins and the D7 long form bind serotonin with high affinity, as well as histamine and norepinephrine

Core Functions

D7r3 functions as a kratagonist by binding and sequestering host biogenic amines (serotonin, histamine, norepinephrine, adrenaline) during blood feeding, thereby preventing vasoconstriction, platelet aggregation, and inflammation at the feeding site.

Molecular Function:
serotonin binding
Directly Involved In:
Cellular Locations:
Supporting Evidence:
  • UniProt:A0A1S4GYH9
    Modulates blood feeding of female mosquitoes on vertebrate species by binding and sequestering different mediators involved in the host response
  • PMID:16301315
    four of these five short D7 proteins and the D7 long form bind serotonin with high affinity, as well as histamine and norepinephrine

D7r3 also binds histamine to prevent host inflammatory responses during blood feeding.

Molecular Function:
histamine binding
Directly Involved In:
Cellular Locations:
Supporting Evidence:
  • UniProt:A0A1S4GYH9
    Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)

References

Gene Ontology annotation through association of InterPro records with GO terms
Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt
Function and evolution of a mosquito salivary protein family
  • D7 short proteins bind serotonin, histamine and norepinephrine with high affinity
    "four of these five short D7 proteins and the D7 long form bind serotonin with high affinity, as well as histamine and norepinephrine"
  • Scavenging host amines antagonizes vasoconstriction and platelet aggregation
    "Scavenging of host amines would antagonize their vasoconstrictor, platelet-aggregating, and pain-inducing properties"
Antibody response against saliva antigens of Anopheles gambiae and Aedes aegypti in travellers in tropical Africa
  • D7r3 was identified in female Anopheles gambiae saliva by mass spectrometry
    "A proteomic and immunoproteomic analysis of anopheles and Aedes saliva allowed for the identification of some antigens that were recognized by most of the exposed individuals"
A cluster of four D7-related genes is expressed in the salivary glands of the African malaria vector Anopheles gambiae
  • D7r genes are expressed in adult female salivary glands
    "Four genes expressed in the Anopheles gambiae adult female salivary glands and similar in sequence to the Aedes aegypti D7 gene were identified"
Trapping cDNAs encoding secreted proteins from the salivary glands of the malaria vector Anopheles gambiae
  • D7-related genes were identified in A. gambiae salivary glands
    "Fragments showing a high degree of similarity to D7 and apyrase, two salivary gland-specific genes previously found in Aedes aegypti, were identified"
UniProt:A0A1S4GYH9
UniProt entry for D7R3_ANOGA
  • D7r3 modulates blood feeding by binding host mediators
    "Modulates blood feeding of female mosquitoes on vertebrate species by binding and sequestering different mediators involved in the host response"
  • Binds serotonin, noradrenaline, histamine and adrenaline
    "Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)"
  • Inhibits smooth muscle contraction
    "Inhibits histamine-, serotonin- and noradrenaline-induced smooth muscle contraction (PubMed:16301315)"
  • Exhibits vasodilating activity
    "Exhibits vasodilating activity (PubMed:16301315)"
  • Protein is secreted
    "SUBCELLULAR LOCATION: Secreted"
file:ANOGA/D7r1/D7r1-deep-research-falcon.md
Deep research review of D7 family function and evolution
  • D7 proteins function as kratagonists that scavenge host signaling molecules
    "D7 proteins are among the most abundant mosquito salivary proteins and function as kratagonists - high-affinity scavengers of host small-molecule inflammatory and hemostatic mediators"
  • Short-form D7s bind biogenic amines
    "Short-form D7s (including D7r1) predominantly bind biogenic amines (serotonin/5-HT, histamine, epinephrine/norepinephrine)"

Suggested Questions for Experts

Q: What is the binding affinity (Kd) of D7r3 for serotonin vs histamine vs norepinephrine, and does it show preference for one over the others?

Suggested experts: Calvo E, Ribeiro JM

Q: Are there functional differences between D7r3 and other short-form D7 proteins (D7r1, D7r2, D7r4) in terms of ligand binding specificity or tissue expression?

Suggested experts: Calvo E, Mans BJ

Suggested Experiments

Experiment: Generate D7r3 knockout A. gambiae using CRISPR and measure blood meal size, feeding time, and feeding success rate compared to wild-type and D7r1 knockout controls

Hypothesis: D7r3 knockout mosquitoes will have reduced blood feeding efficiency due to host hemostatic responses

Type: Gene knockout and feeding assay

Experiment: Perform quantitative binding assays (isothermal microcalorimetry or surface plasmon resonance) comparing D7r3 and D7r1 affinities for serotonin, histamine, norepinephrine, and adrenaline

Hypothesis: D7r3 and D7r1 have overlapping but non-identical ligand binding profiles

Type: Biochemical binding assays

📚 Additional Documentation

Deep Research Falcon

(D7r3-deep-research-falcon.md)

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gene_info: Name=D7r3 {ECO:0000303|PubMed:16301315};
organism_full: Anopheles gambiae (African malaria mosquito).
protein_family: Belongs to the PBP/GOBP family. .
protein_domains: PBP/GOBP. (IPR006170); PBP_GOBP_sf. (IPR036728); PBP_GOBP (PF01395)
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Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: A0A1S4GYH9
  • Protein Description: RecName: Full=Short form salivary protein D7R3 {ECO:0000305}; AltName: Full=D7-related 3 protein {ECO:0000312|EMBL:CAB39729.1}; Flags: Precursor;
  • Gene Information: Name=D7r3 {ECO:0000303|PubMed:16301315};
  • Organism (full): Anopheles gambiae (African malaria mosquito).
  • Protein Family: Belongs to the PBP/GOBP family. .
  • Key Domains: PBP/GOBP. (IPR006170); PBP_GOBP_sf. (IPR036728); PBP_GOBP (PF01395)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "D7r3" matches the protein description above
  2. Verify the organism is correct: Anopheles gambiae (African malaria mosquito).
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'D7r3' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene D7r3 (gene ID: D7r3, UniProt: A0A1S4GYH9) in ANOGA.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: A0A1S4GYH9
  • Protein Description: RecName: Full=Short form salivary protein D7R3 {ECO:0000305}; AltName: Full=D7-related 3 protein {ECO:0000312|EMBL:CAB39729.1}; Flags: Precursor;
  • Gene Information: Name=D7r3 {ECO:0000303|PubMed:16301315};
  • Organism (full): Anopheles gambiae (African malaria mosquito).
  • Protein Family: Belongs to the PBP/GOBP family. .
  • Key Domains: PBP/GOBP. (IPR006170); PBP_GOBP_sf. (IPR036728); PBP_GOBP (PF01395)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "D7r3" matches the protein description above
  2. Verify the organism is correct: Anopheles gambiae (African malaria mosquito).
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'D7r3' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene D7r3 (gene ID: D7r3, UniProt: A0A1S4GYH9) in ANOGA.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Title: Functional Annotation of Anopheles gambiae D7r3 (UniProt: A0A1S4GYH9)

Executive summary
We verified that D7r3 is a short-form D7 salivary protein from Anopheles gambiae belonging to the odorant/pheromone-binding protein superfamily (PBP/GOBP), secreted by female salivary glands and deployed during blood feeding. Short-form D7s, including D7r3, function primarily as non-enzymatic “kratagonists” that sequester host biogenic amines (notably serotonin, and to varying degrees norepinephrine, histamine, and epinephrine) to suppress vasoconstriction, platelet activation, pain, and inflammation at the bite site. Quantitative binding data indicate D7r3 binds serotonin with subnanomolar-to-low-nanomolar affinity and other biogenic amines with lower affinity. Recent research (2023–2024) highlights translational uses of D7 proteins as exposure biomarkers and expands functional genetics in mosquitoes; transcriptomic data associate overexpression of salivary proteins (including D7 family members) with insecticide resistance in Anopheles arabiensis. (calvo2006functionandevolution pages 1-1, calvo2006functionandevolution pages 4-5, oseno2022characterizationofanopheles pages 1-2, omoke2024wholetranscriptomicanalysis pages 12-14, martinmartin2023aedesaegyptid7 pages 7-9)

1) Key concepts and definitions with current understanding
- Identity and nomenclature verification
- D7r3 is one of five short-form D7 paralogs (D7r1–D7r5) within the D7 gene cluster of An. gambiae; the D7 family contains three long-form and five short-form members within ~20 kb on chromosome 3R. This matches the provided UniProt accession and the short-form annotation. (Arcà et al., 2017; BMC Genomics; https://doi.org/10.1186/s12864-017-3579-8). (arca2017anophelinesalivaryprotein pages 7-9)
- D7 proteins are distantly related to odorant-binding proteins and belong to the PBP/GOBP-related superfamily, consistent with the PBP/GOBP domain model. (Valenzuela et al., 2002; Insect Mol Biol; https://doi.org/10.1046/j.1365-2583.2002.00319.x). (valenzuela2002thed7family pages 3-6)

  • Protein form and domains
  • Short-form D7s (~17–18 kDa) comprise a single OBP-like domain; long-form D7s possess two OBP-like domains with bifunctional ligand binding (N-terminal domain typically binding eicosanoids; C-terminal domain binding biogenic amines). The short-form classification of D7r3 aligns with a single OBP-like domain. (Arcà et al., 2017; Valenzuela et al., 2002). (arca2017anophelinesalivaryprotein pages 7-9, valenzuela2002thed7family pages 3-6)

  • Localization and secretion

  • D7s are abundantly and specifically expressed in adult female salivary glands and are secreted into saliva for deployment during blood feeding. Recombinant antigen work for An. gambiae included D7r3 among expressed short forms for human IgG assays, supporting its identity as a secreted salivary antigen. (Calvo et al., 2006; J Biol Chem; https://doi.org/10.1074/jbc.m510359200; Oseno et al., 2022; Parasites & Vectors; https://doi.org/10.1186/s13071-021-05130-5). (calvo2006functionandevolution pages 1-1, oseno2022characterizationofanopheles pages 1-2)

  • Primary biochemical function

  • Short-form D7s are non-enzymatic scavengers of host biogenic amines (serotonin, histamine, norepinephrine, epinephrine), reducing vasoconstriction, platelet aggregation, pain, and inflammatory signaling at bite sites—thereby facilitating hematophagy. (Calvo et al., 2006; J Biol Chem). (calvo2006functionandevolution pages 1-1, calvo2006functionandevolution pages 5-6)

2) Recent developments and latest research (priority to 2023–2024)
- Functional genetics of D7 proteins (Aedes model)
- CRISPR/Cas9 knockouts of D7 long forms in Aedes aegypti (D7L1/D7L2) increased probing time; phenotypes were rescued in leukotriene-deficient mice, highlighting in vivo leukotriene scavenging. While focused on Aedes, these data reinforce D7s’ conserved anti-inflammatory roles at blood-feeding sites. (mBio, Dec 2023; https://doi.org/10.1128/mbio.02289-23). (martinmartin2023aedesaegyptid7 pages 7-9)

  • Exposure biomarkers and sero-epidemiology
  • An. gambiae D7 antigens (including D7r3) elicited strong IgG responses in malaria-exposed populations; D7L2 antibody levels correlated with exposure intensity and were reduced among bednet users, demonstrating utility as serological markers of vector contact. (Oseno et al., 2022; https://doi.org/10.1186/s13071-021-05130-5). (oseno2022characterizationofanopheles pages 1-2)
  • Systematic review (Aedes spp.) supports the broader concept: anti-saliva (including anti-D7) antibody responses reflect mosquito exposure dynamics and vary with age and epidemiological context. (Frontiers in Tropical Diseases, Nov 2023; https://doi.org/10.3389/fitd.2023.1145340). (etienne2023antibodiestoaedes pages 9-11)

  • Insecticide resistance context

  • Whole-transcriptome analyses in field An. arabiensis populations (Kenya) showed widespread overexpression of salivary gland proteins, including D7 family members (e.g., D7L1/D7L2), associated with pyrethroid and organophosphate resistance. While species- and paralog-specific effects vary, this links D7-family overexpression to resistance phenotypes in Anopheles. (BMC Genomics, Mar 2024; https://doi.org/10.1186/s12864-024-10182-9). (omoke2024wholetranscriptomicanalysis pages 12-14)

3) Current applications and real-world implementations
- Exposure monitoring and public health surveillance
- D7 antigens (short and long forms) have been used as sero-epidemiological tools to quantify human–vector contact, inform transmission intensity, and evaluate interventions (e.g., bednet use). D7r3 was part of the antigen panel in An. gambiae. (Oseno et al., 2022; https://doi.org/10.1186/s13071-021-05130-5). (oseno2022characterizationofanopheles pages 1-2)
- Broader pooled analyses in Aedes systems underpin anti-saliva IgG as markers of exposure, supporting the translational use-case across mosquito genera. (Etienne et al., 2023; https://doi.org/10.3389/fitd.2023.1145340). (etienne2023antibodiestoaedes pages 9-11)

  • Mechanistic underpinnings of saliva-assisted transmission and feeding
  • While direct 2023–2024 D7r3-specific data are limited, the Aedes CRISPR study indicates D7 proteins shorten probing time via leukotriene scavenging and can modulate parasite infection outcomes, suggesting D7s (by extension short forms in Anopheles) contribute to both feeding efficiency and pathogen ecology. (mBio, 2023; https://doi.org/10.1128/mbio.02289-23). (martinmartin2023aedesaegyptid7 pages 7-9)

4) Expert opinions and analysis from authoritative sources
- Comprehensive functional framework
- Foundational work in An. gambiae established that short-form D7s—including D7r3—bind biogenic amines with high affinity (serotonin highest), acting as kratagonists to inhibit host hemostatic and inflammatory pathways at the bite site. This consensus view, from J Biol Chem (2006) and evolutionary analyses (BMC Genomics, 2017), remains current for D7r3’s principal function. (https://doi.org/10.1074/jbc.m510359200; https://doi.org/10.1186/s12864-017-3579-8). (calvo2006functionandevolution pages 4-5, arca2017anophelinesalivaryprotein pages 7-9)
- The D7 family’s relationship to OBP/PBP-GOBP proteins and the division into short and long forms—with long forms often binding eicosanoids and short forms specializing in biogenic amines—provides a structural/evolutionary rationale for D7r3’s substrate scope. (Insect Mol Biol, 2002; https://doi.org/10.1046/j.1365-2583.2002.00319.x). (valenzuela2002thed7family pages 3-6)

5) Relevant statistics and data from recent and foundational studies
- Binding specificity and affinity (D7r3; An. gambiae; isothermal titration calorimetry)
- Serotonin (5-HT): Kd ≈ 0.16 (units as reported; subnanomolar–low-nanomolar context); stoichiometry ≈ 0.64–0.71 per protein, consistent with one binding site. (J Biol Chem, 2006; https://doi.org/10.1074/jbc.m510359200). (calvo2006functionandevolution pages 4-5)
- Norepinephrine: Kd ≈ 3.19; Histamine: Kd ≈ 41; Epinephrine: Kd ≈ 312. Relative affinities: 5-HT >> NE > Histamine > Epi. (J Biol Chem, 2006). (calvo2006functionandevolution pages 4-5)
- Functional assays: short-form D7s antagonize smooth-muscle responses to 5-HT/Histamine/NE; D7r1 uniquely showed anticoagulant activity in clotting assays, not shared by other short forms at higher concentrations—implying D7r3 lacks the D7r1-specific anticoagulant effect. (J Biol Chem, 2006). (calvo2006functionandevolution pages 5-6, calvo2006functionandevolution pages 4-5)

  • Expression, abundance, and deployment during feeding
  • D7 proteins may account for ~5–20% of total salivary protein; salivary glands contain ~1–3 µg total protein and ~50% is secreted during a feed; local sequestration needs estimated at ~0.03–0.3 µg for effective antagonism. (J Biol Chem, 2006). (calvo2006functionandevolution pages 5-6)
  • Transcript evidence: D7r1–D7r4 have high EST counts (~70–200), whereas D7r5 is low (~7), indicating D7r3 belongs to the highly expressed subset. (J Biol Chem, 2006). (calvo2006functionandevolution pages 6-7)

  • Evolutionary and structural context

  • Short D7s likely arose by truncation/duplication from long D7 ancestors; across anophelines, short forms retained/optimized amine binding (5-HT ancestral), with paralog-specific tuning (e.g., NE/Epi binding optimized in the D7r2/3 clade). (J Biol Chem, 2006; BMC Genomics, 2017). (calvo2006functionandevolution pages 6-7, arca2017anophelinesalivaryprotein pages 7-9)

  • 2023–2024 field-relevant findings

  • An. arabiensis resistance transcriptomics: salivary gland protein overexpression rates of ≈93–97% across comparisons; D7L1/D7L2 among upregulated SGPs associated with pyrethroid and organophosphate resistance—implicating salivary families in resistance-associated expression programs. (BMC Genomics, 2024; https://doi.org/10.1186/s12864-024-10182-9). (omoke2024wholetranscriptomicanalysis pages 12-14)

Pathways and localization
- Site of action: extracellular (host dermis at the bite site), where secreted D7 proteins bind host agonists in the hemostasis and inflammatory pathways. (Calvo et al., 2006; https://doi.org/10.1074/jbc.m510359200). (calvo2006functionandevolution pages 1-1, calvo2006functionandevolution pages 5-6)
- Pathways impacted: vasoconstriction (norepinephrine/epinephrine), platelet activation/aggregation (serotonin, histamine, ADP in long-form D7s in other genera), and inflammation/itch/pain (histamine, leukotrienes notably for long forms). For D7r3, the dominant target class is biogenic amines. (Calvo et al., 2006; Arcà et al., 2017). (calvo2006functionandevolution pages 4-5, arca2017anophelinesalivaryprotein pages 7-9)

Ambiguity and limits of the literature for D7r3
- The D7 family is well-characterized; however, D7r3-specific literature is less extensive than for D7r1 and D7r4 (including structural studies on D7r4). Where D7r3-specific data are limited, we infer function from direct binding measurements for D7r3 (biogenic amines) and from paralog/family context indicating no eicosanoid binding by short forms. We did not find short-form D7r3 eicosanoid binding. (Calvo et al., 2006; Arcà et al., 2017). (calvo2006functionandevolution pages 4-5, arca2017anophelinesalivaryprotein pages 7-9)

Verification against mandatory criteria
- Gene symbol, organism, family/domains: Verified as Anopheles gambiae D7r3, short-form D7 in the PBP/GOBP-related family. (Arcà et al., 2017; Valenzuela et al., 2002). (arca2017anophelinesalivaryprotein pages 7-9, valenzuela2002thed7family pages 3-6)
- Organism correctness: All cited An. gambiae/Anopheles sources are consistent with the target organism. (arca2017anophelinesalivaryprotein pages 7-9, calvo2006functionandevolution pages 1-1)
- Family/domains alignment: D7 family is OBP/PBP-GOBP-related; short form consistent with single OBP-like domain. (valenzuela2002thed7family pages 3-6, arca2017anophelinesalivaryprotein pages 7-9)

Primary functional annotation for D7r3 (concise)
- Molecular function: High-affinity binding to serotonin; moderate-to-low affinity binding to norepinephrine, histamine, and epinephrine; non-enzymatic sequestration of biogenic amines. (Calvo et al., 2006; https://doi.org/10.1074/jbc.m510359200). (calvo2006functionandevolution pages 4-5)
- Biological process: Anti-hemostatic/anti-inflammatory action aiding blood meal acquisition by antagonizing vasoconstriction, platelet aggregation, and inflammatory signaling. (Calvo et al., 2006; Arcà et al., 2017). (calvo2006functionandevolution pages 5-6, arca2017anophelinesalivaryprotein pages 7-9)
- Cellular component: Secreted protein from female salivary glands; acts extracellularly in host skin at the bite site. (Calvo et al., 2006; Oseno et al., 2022). (calvo2006functionandevolution pages 1-1, oseno2022characterizationofanopheles pages 1-2)

URLs and publication dates (selection)
- Calvo et al., 2006 (J Biol Chem), Jan 2006: https://doi.org/10.1074/jbc.m510359200 (binding and function for short forms, including D7r3). (calvo2006functionandevolution pages 4-5)
- Arcà et al., 2017 (BMC Genomics), Feb 2017: https://doi.org/10.1186/s12864-017-3579-8 (evolutionary overview, gene family structure). (arca2017anophelinesalivaryprotein pages 7-9)
- Valenzuela et al., 2002 (Insect Mol Biol), Apr 2002: https://doi.org/10.1046/j.1365-2583.2002.00319.x (D7 family description; OBP/PBP-GOBP relation). (valenzuela2002thed7family pages 3-6)
- Oseno et al., 2022 (Parasites & Vectors), Jan 2022: https://doi.org/10.1186/s13071-021-05130-5 (D7r3 included among An. gambiae D7 antigens; biomarker results). (oseno2022characterizationofanopheles pages 1-2)
- Etienne et al., 2023 (Frontiers in Tropical Diseases), Nov 2023: https://doi.org/10.3389/fitd.2023.1145340 (pooled analysis of anti-saliva antibody responses; Aedes-focused but relevant to D7 biomarker concept). (etienne2023antibodiestoaedes pages 9-11)
- Martin-Martin et al., 2023 (mBio), Dec 2023: https://doi.org/10.1128/mbio.02289-23 (CRISPR functional genetics of D7 long forms; conserved roles). (martinmartin2023aedesaegyptid7 pages 7-9)
- Omoke et al., 2024 (BMC Genomics), Mar 2024: https://doi.org/10.1186/s12864-024-10182-9 (SGP, including D7 family, overexpression in resistant An. arabiensis). (omoke2024wholetranscriptomicanalysis pages 12-14)

Integrated synthesis artifact
| Feature | Summary | Data / Values | Sources |
|---|---|---:|---|
| Identity verification | D7r3 is a short-form D7 salivary protein from Anopheles gambiae; member of the PBP/GOBP (OBP-like) family. | Gene symbol: D7r3; organism: An. gambiae; UniProt (user-supplied): A0A1S4GYH9. | (arca2017anophelinesalivaryprotein pages 7-9, valenzuela2002thed7family pages 3-6, calvo2006functionandevolution pages 1-1) |
| Localization & detection | Secreted, adult female salivary-gland specific; detected in salivary gland and saliva proteomes. | Salivary-gland expression (female-only); present in saliva proteomes and recombinant antigen studies. | (calvo2006functionandevolution pages 1-1, oseno2022characterizationofanopheles pages 1-2, sorsuwan2014identificationofsalivary pages 9-9) |
| Biochemical function & ligand specificity | Scavenges host biogenic amines to antagonize vasoconstriction, platelet activation and pain. Short-form D7r3 binds biogenic amines (serotonin strongest). Eicosanoid binding not reported for D7r3. | Approximate affinities reported (Calvo et al. 2006): Kd ≈ 0.16 (serotonin), 3.19 (norepinephrine), 41 (histamine), 312 (epinephrine); stoichiometry ~0.6–0.7 per protein. | (calvo2006functionandevolution pages 4-5, calvo2006functionandevolution pages 2-3, calvo2006functionandevolution pages 5-6) |
| Structural notes | D7 family related to odorant/pheromone-binding proteins (PBP/GOBP); short vs long distinction driven by presence/absence of N-terminal domain. | Short D7s: ~144–148 aa (~17 kDa), single OBP-like domain; long D7s: two OBP-like domains (bifunctional ligand pockets). | (valenzuela2002thed7family pages 3-6, arca2017anophelinesalivaryprotein pages 7-9, calvo2006functionandevolution pages 1-1) |
| Quantitative/statistical highlights | Abundance estimates, expression evidence and resistance-associated upregulation. | D7 proteins estimated to comprise ~5–20% of total salivary protein; local sequestration requirement ~0.03–0.3 µg; salivary gland total ~1–3 µg (≈ half secreted per feed); EST counts for D7r1–r4 ≈70–200 vs ~7 for D7r5; insecticide-resistant Anopheles arabiensis shows widespread SGP upregulation (SGP upregulation ≈96–97% in some Res–Sus comparisons). | (calvo2006functionandevolution pages 5-6, calvo2006functionandevolution pages 4-5, calvo2006functionandevolution pages 6-7, omoke2024wholetranscriptomicanalysis pages 12-14) |
| Applications & recent developments (2022–2024) | D7s as exposure biomarkers, immunological assays, functional genetics and links to resistance; vaccine/antigen interest. | D7 antigens (short and long forms) elicit human IgG and D7L2 correlates with exposure and bednet use (Oseno 2022); pooled analyses of anti-saliva antibodies support transient exposure signals (Etienne 2023); CRISPR KO of D7 long proteins in Aedes reveals effects on probing time and parasite infection (Martin-Martin 2023); transcriptomics shows D7-family upregulation in insecticide-resistant mosquitoes (Omoke 2024). | (oseno2022characterizationofanopheles pages 1-2, etienne2023antibodiestoaedes pages 9-11, martinmartin2023aedesaegyptid7 pages 7-9, omoke2024wholetranscriptomicanalysis pages 12-14) |

Table: Concise verification and synthesis table summarizing identity, localization, biochemical activity (with approximate Kd values), structural features, quantitative findings, and 2022–2024 applications/research developments for Anopheles gambiae D7r3. Sources cite key extracted evidence (pqac-...).

Conclusions
D7r3 of Anopheles gambiae is a secreted short-form D7 salivary protein in the PBP/GOBP-related family that primarily binds biogenic amines—most strongly serotonin—with quantitative affinities supporting a potent kratagonist role at the blood-feeding site. Its biochemical specificity and salivary deployment position it as an anti-hemostatic/anti-inflammatory effector promoting blood meal acquisition. While D7r3-specific literature is limited relative to some paralogs, direct binding data exist, and family-level evidence provides a coherent mechanism and pathway context. Contemporary applications leverage D7 proteins (including D7r3 as an antigen) as exposure biomarkers, and recent field transcriptomics link salivary protein upregulation (including D7s) to insecticide resistance, underscoring the epidemiological and vector-control relevance of this protein family. (calvo2006functionandevolution pages 4-5, calvo2006functionandevolution pages 1-1, oseno2022characterizationofanopheles pages 1-2, omoke2024wholetranscriptomicanalysis pages 12-14, martinmartin2023aedesaegyptid7 pages 7-9)

References

  1. (calvo2006functionandevolution pages 1-1): Eric Calvo, Ben J. Mans, John F. Andersen, and José M.C. Ribeiro. Function and evolution of a mosquito salivary protein family*. Journal of Biological Chemistry, 281:1935-1942, Jan 2006. URL: https://doi.org/10.1074/jbc.m510359200, doi:10.1074/jbc.m510359200. This article has 292 citations and is from a domain leading peer-reviewed journal.

  2. (calvo2006functionandevolution pages 4-5): Eric Calvo, Ben J. Mans, John F. Andersen, and José M.C. Ribeiro. Function and evolution of a mosquito salivary protein family*. Journal of Biological Chemistry, 281:1935-1942, Jan 2006. URL: https://doi.org/10.1074/jbc.m510359200, doi:10.1074/jbc.m510359200. This article has 292 citations and is from a domain leading peer-reviewed journal.

  3. (oseno2022characterizationofanopheles pages 1-2): Brenda Oseno, Faith Marura, Rodney Ogwang, Martha Muturi, James Njunge, Irene Nkumama, Robert Mwakesi, Kennedy Mwai, Martin K. Rono, Ramadhan Mwakubambanya, Faith Osier, and James Tuju. Characterization of anopheles gambiae d7 salivary proteins as markers of human–mosquito bite contact. Parasites & Vectors, Jan 2022. URL: https://doi.org/10.1186/s13071-021-05130-5, doi:10.1186/s13071-021-05130-5. This article has 11 citations and is from a peer-reviewed journal.

  4. (omoke2024wholetranscriptomicanalysis pages 12-14): Diana Omoke, Lucy Mackenzie Impoinvil, Dieunel Derilus, Stephen Okeyo, Helga Saizonou, Nicola Mulder, Nsa Dada, Audrey Lenhart, Luc Djogbénou, and Eric Ochomo. Whole transcriptomic analysis reveals overexpression of salivary gland and cuticular proteins genes in insecticide-resistant anopheles arabiensis from western kenya. BMC Genomics, Mar 2024. URL: https://doi.org/10.1186/s12864-024-10182-9, doi:10.1186/s12864-024-10182-9. This article has 7 citations and is from a peer-reviewed journal.

  5. (martinmartin2023aedesaegyptid7 pages 7-9): Ines Martin-Martin, Bianca Burini Kojin, Azadeh Aryan, Adeline E. Williams, Alvaro Molina-Cruz, Paola Carolina Valenzuela-Leon, Gaurav Shrivastava, Karina Botello, Mahnaz Minai, Zach N. Adelman, and Eric Calvo. aedes aegypti d7 long salivary proteins modulate blood feeding and parasite infection. mBio, Dec 2023. URL: https://doi.org/10.1128/mbio.02289-23, doi:10.1128/mbio.02289-23. This article has 14 citations and is from a domain leading peer-reviewed journal.

  6. (arca2017anophelinesalivaryprotein pages 7-9): Bruno Arcà, Fabrizio Lombardo, Claudio J. Struchiner, and José M. C. Ribeiro. Anopheline salivary protein genes and gene families: an evolutionary overview after the whole genome sequence of sixteen anopheles species. BMC Genomics, Feb 2017. URL: https://doi.org/10.1186/s12864-017-3579-8, doi:10.1186/s12864-017-3579-8. This article has 86 citations and is from a peer-reviewed journal.

  7. (valenzuela2002thed7family pages 3-6): J. G. Valenzuela, R. Charlab, E. C. Gonzalez, I. K. F. De Miranda‐Santos, O. Marinotti, I. M. B. Francischetti, and J. M. C. Ribeiro. The d7 family of salivary proteins in blood sucking diptera. Insect Molecular Biology, 11:149-155, Apr 2002. URL: https://doi.org/10.1046/j.1365-2583.2002.00319.x, doi:10.1046/j.1365-2583.2002.00319.x. This article has 128 citations and is from a peer-reviewed journal.

  8. (calvo2006functionandevolution pages 5-6): Eric Calvo, Ben J. Mans, John F. Andersen, and José M.C. Ribeiro. Function and evolution of a mosquito salivary protein family*. Journal of Biological Chemistry, 281:1935-1942, Jan 2006. URL: https://doi.org/10.1074/jbc.m510359200, doi:10.1074/jbc.m510359200. This article has 292 citations and is from a domain leading peer-reviewed journal.

  9. (etienne2023antibodiestoaedes pages 9-11): Veronique Etienne, Adriana Gallagher, Rebecca C. Christofferson, Michael K. McCracken, Derek A.T. Cummings, and Maureen T. Long. Antibodies to aedes spp. salivary proteins: a systematic review and pooled analysis. Frontiers in Tropical Diseases, Nov 2023. URL: https://doi.org/10.3389/fitd.2023.1145340, doi:10.3389/fitd.2023.1145340. This article has 4 citations.

  10. (calvo2006functionandevolution pages 6-7): Eric Calvo, Ben J. Mans, John F. Andersen, and José M.C. Ribeiro. Function and evolution of a mosquito salivary protein family*. Journal of Biological Chemistry, 281:1935-1942, Jan 2006. URL: https://doi.org/10.1074/jbc.m510359200, doi:10.1074/jbc.m510359200. This article has 292 citations and is from a domain leading peer-reviewed journal.

  11. (sorsuwan2014identificationofsalivary pages 9-9): Sriwatapron Sor-suwan, Narissara Jariyapan, Sittiruk Roytrakul, Atchara Paemanee, Atchara Phumee, Benjarat Phattanawiboon, Nuchpicha Intakhan, Wetpisit Chanmol, Paul A. Bates, Atiporn Saeung, and Wej Choochote. Identification of salivary gland proteins depleted after blood feeding in the malaria vector anopheles campestris-like mosquitoes (diptera: culicidae). PLoS ONE, 9:e90809, Mar 2014. URL: https://doi.org/10.1371/journal.pone.0090809, doi:10.1371/journal.pone.0090809. This article has 14 citations and is from a peer-reviewed journal.

  12. (calvo2006functionandevolution pages 2-3): Eric Calvo, Ben J. Mans, John F. Andersen, and José M.C. Ribeiro. Function and evolution of a mosquito salivary protein family*. Journal of Biological Chemistry, 281:1935-1942, Jan 2006. URL: https://doi.org/10.1074/jbc.m510359200, doi:10.1074/jbc.m510359200. This article has 292 citations and is from a domain leading peer-reviewed journal.

Citations

  1. arca2017anophelinesalivaryprotein pages 7-9
  2. oseno2022characterizationofanopheles pages 1-2
  3. etienne2023antibodiestoaedes pages 9-11
  4. omoke2024wholetranscriptomicanalysis pages 12-14
  5. calvo2006functionandevolution pages 4-5
  6. calvo2006functionandevolution pages 5-6
  7. calvo2006functionandevolution pages 6-7
  8. calvo2006functionandevolution pages 1-1
  9. sorsuwan2014identificationofsalivary pages 9-9
  10. calvo2006functionandevolution pages 2-3
  11. https://doi.org/10.1186/s12864-017-3579-8
  12. https://doi.org/10.1046/j.1365-2583.2002.00319.x
  13. https://doi.org/10.1074/jbc.m510359200;
  14. https://doi.org/10.1186/s13071-021-05130-5
  15. https://doi.org/10.1128/mbio.02289-23
  16. https://doi.org/10.3389/fitd.2023.1145340
  17. https://doi.org/10.1186/s12864-024-10182-9
  18. https://doi.org/10.1074/jbc.m510359200
  19. https://doi.org/10.1074/jbc.m510359200,
  20. https://doi.org/10.1186/s13071-021-05130-5,
  21. https://doi.org/10.1186/s12864-024-10182-9,
  22. https://doi.org/10.1128/mbio.02289-23,
  23. https://doi.org/10.1186/s12864-017-3579-8,
  24. https://doi.org/10.1046/j.1365-2583.2002.00319.x,
  25. https://doi.org/10.3389/fitd.2023.1145340,
  26. https://doi.org/10.1371/journal.pone.0090809,

📄 View Raw YAML

id: A0A1S4GYH9
gene_symbol: D7r3
product_type: PROTEIN
status: DRAFT
taxon:
  id: NCBITaxon:7165
  label: Anopheles gambiae
description: >-
  D7r3 is a short-form salivary protein from female Anopheles gambiae mosquitoes that facilitates
  blood feeding by binding and sequestering host biogenic amines (serotonin, histamine, norepinephrine,
  and adrenaline). Like D7r1 and other short-form D7 proteins, it functions as a "kratagonist" -
  capturing host signaling molecules with high affinity to prevent their vasoconstrictive, platelet-aggregating,
  and inflammatory effects. The protein is secreted into saliva during blood feeding. D7r3 belongs
  to the PBP/GOBP (Pheromone/Odorant-Binding Protein) structural family but has evolved a distinct
  function unrelated to olfaction.
existing_annotations:
- term:
    id: GO:0005549
    label: odorant binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  review:
    summary: >-
      This annotation is based on structural family membership (PBP/GOBP family via InterPro
      IPR006170) but does not reflect the actual function of D7r3. The protein binds biogenic
      amines (serotonin, histamine, norepinephrine, adrenaline), not odorants, and has no role
      in olfaction.
    action: MODIFY
    reason: >-
      D7r3 belongs to the PBP/GOBP structural family (InterPro IPR006170), which led to this
      IEA annotation. However, the D7 proteins have evolutionarily repurposed this fold for
      binding biogenic amines in saliva, not odorants in antennae. D7r3 is expressed exclusively
      in female salivary glands [PMID:11841502, PMID:9990055], not olfactory tissues. UniProt
      explicitly states "Binds serotonin, noradrenaline, histamine and adrenaline" [UniProt:A0A1S4GYH9,
      PMID:16301315]. The actual molecular functions are serotonin binding (GO:0051378) and
      histamine binding (GO:0051381). This is a clear case where structural homology does not
      predict function. The GO:0005549 definition "Binding to an odorant, any substance capable
      of stimulating the sense of smell" does not apply - serotonin and histamine are not odorants.
      Deep research on D7 family confirms "short-form D7s (including D7r1) predominantly bind
      biogenic amines (serotonin/5-HT, histamine, epinephrine/norepinephrine)"
      [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
    proposed_replacement_terms:
      - id: GO:0051378
        label: serotonin binding
      - id: GO:0051381
        label: histamine binding
    supported_by:
      - reference_id: UniProt:A0A1S4GYH9
        supporting_text: >-
          Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)
      - reference_id: PMID:16301315
        supporting_text: >-
          four of these five short D7 proteins and the D7 long form bind serotonin with high
          affinity, as well as histamine and norepinephrine

- term:
    id: GO:0005576
    label: extracellular region
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  review:
    summary: >-
      This annotation correctly reflects the subcellular localization of D7r3 as a secreted
      salivary protein. However, there is a more specific IDA annotation for extracellular
      space (GO:0005615) from PMID:17913537.
    action: ACCEPT
    reason: >-
      D7r3 is a secreted protein with a signal peptide (residues 1-21) [UniProt:A0A1S4GYH9].
      It is released into the extracellular space (saliva) during blood feeding. The UniProt
      entry confirms "SUBCELLULAR LOCATION: Secreted" [UniProt:A0A1S4GYH9]. This is an
      appropriate CC annotation, though the more specific GO:0005615 (extracellular space)
      with IDA evidence from PMID:17913537 is also present.
    supported_by:
      - reference_id: UniProt:A0A1S4GYH9
        supporting_text: "SUBCELLULAR LOCATION: Secreted"

- term:
    id: GO:0042311
    label: vasodilation
  evidence_type: IEA
  original_reference_id: GO_REF:0000043
  review:
    summary: >-
      This annotation captures one downstream effect of D7r3's biogenic amine scavenging
      activity. By sequestering serotonin and norepinephrine (vasoconstrictors), D7r3
      indirectly promotes vasodilation at the feeding site.
    action: KEEP_AS_NON_CORE
    reason: >-
      UniProt states "Exhibits vasodilating activity" [UniProt:A0A1S4GYH9, PMID:16301315].
      However, this is an indirect effect - D7r3 does not directly cause vasodilation but
      rather prevents vasoconstriction by scavenging host vasoconstrictive amines. The primary
      molecular function is binding biogenic amines (kratagonism), with vasodilation being a
      downstream consequence. This is acceptable as a non-core BP annotation describing the
      physiological outcome in the host. The deep research notes "Scavenging of host amines
      would antagonize their vasoconstrictor, platelet-aggregating, and pain-inducing properties"
      [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
    supported_by:
      - reference_id: UniProt:A0A1S4GYH9
        supporting_text: >-
          Exhibits vasodilating activity (PubMed:16301315)
      - reference_id: PMID:16301315
        supporting_text: >-
          Scavenging of host amines would antagonize their vasoconstrictor, platelet-aggregating,
          and pain-inducing properties

- term:
    id: GO:0097746
    label: blood vessel diameter maintenance
  evidence_type: IEA
  original_reference_id: GO_REF:0000043
  review:
    summary: >-
      This annotation is overly general. D7r3 affects blood vessel diameter indirectly by
      scavenging vasoconstrictive amines, but "blood vessel diameter maintenance" implies
      homeostatic regulation, which is not the protein's function.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0097746 (blood vessel diameter maintenance) is defined as "Any process that modulates
      the extent or rate of blood vessel diameter change". While D7r3 does affect vascular tone
      by preventing vasoconstriction (through amine scavenging), calling this "maintenance" is
      misleading. The protein disrupts normal host vascular responses rather than maintaining
      them. The annotation derives from the UniProt "Vasoactive" keyword (KW-0838), but D7r3's
      role is specifically anti-hemostatic modulation of host physiology, not vascular homeostasis.
      The more accurate annotation would be vasodilation (GO:0042311) or negative regulation of
      vasoconstriction.
    supported_by:
      - reference_id: UniProt:A0A1S4GYH9
        supporting_text: >-
          Inhibits histamine-, serotonin- and noradrenaline-induced smooth muscle contraction
          (PubMed:16301315)

- term:
    id: GO:0005615
    label: extracellular space
  evidence_type: IDA
  original_reference_id: PMID:17913537
  review:
    summary: >-
      This annotation is well-supported by direct experimental evidence. PMID:17913537 identified
      D7r3 by mass spectrometry in female saliva, confirming its extracellular localization.
    action: ACCEPT
    reason: >-
      The IDA evidence from PMID:17913537 is based on proteomic identification of D7r3 in
      female Anopheles gambiae saliva. The publication states they performed "proteomic and
      immunoproteomic analysis of anopheles and Aedes saliva" and identified salivary antigens.
      UniProt cites this paper for "IDENTIFICATION BY MASS SPECTROMETRY, SUBCELLULAR LOCATION,
      AND TISSUE SPECIFICITY" [UniProt:A0A1S4GYH9]. This provides direct experimental evidence
      that D7r3 is present in the extracellular space (saliva). This is a core CC annotation.
    supported_by:
      - reference_id: PMID:17913537
        supporting_text: >-
          A proteomic and immunoproteomic analysis of anopheles and Aedes saliva allowed for
          the identification of some antigens that were recognized by most of the exposed
          individuals
      - reference_id: UniProt:A0A1S4GYH9
        supporting_text: >-
          TISSUE SPECIFICITY: Female saliva (at protein level) (PubMed:17913537)

# PROPOSED NEW ANNOTATIONS
- term:
    id: GO:0051378
    label: serotonin binding
  evidence_type: IDA
  original_reference_id: PMID:16301315
  review:
    summary: >-
      D7r3 binds serotonin with high affinity as demonstrated by direct binding assays. This
      is a core molecular function that should be annotated.
    action: NEW
    reason: >-
      UniProt confirms "Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)"
      [UniProt:A0A1S4GYH9]. The protein has specific binding sites for serotonin (residues 31, 59,
      118, 135, 138 by similarity to Q7PNF2). This is the actual molecular function that enables
      kratagonism - sequestering host serotonin to prevent vasoconstriction. GO:0051378 definition
      "Binding to serotonin (5-hydroxytryptamine), a monoamine neurotransmitter" accurately
      describes this function. PMID:16301315 explicitly tested D7 short proteins and showed
      "four of these five short D7 proteins and the D7 long form bind serotonin with high
      affinity". Deep research confirms D7 short forms "bind serotonin, histamine, and
      catecholamines with high affinity" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
    supported_by:
      - reference_id: UniProt:A0A1S4GYH9
        supporting_text: >-
          Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)
      - reference_id: PMID:16301315
        supporting_text: >-
          four of these five short D7 proteins and the D7 long form bind serotonin with high
          affinity, as well as histamine and norepinephrine

- term:
    id: GO:0051381
    label: histamine binding
  evidence_type: IDA
  original_reference_id: PMID:16301315
  review:
    summary: >-
      D7r3 binds histamine as demonstrated by direct binding assays. This is a core molecular
      function that should be annotated.
    action: NEW
    reason: >-
      UniProt confirms "Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)"
      [UniProt:A0A1S4GYH9]. The protein has specific binding sites for histamine (residues 118,
      135, 138 by similarity to Q7PNF2). This is the actual molecular function that enables
      sequestration of host histamine to prevent inflammation. GO:0051381 definition "Binding
      to histamine, a physiologically active amine" accurately describes this function. The
      functional assay in PMID:16301315 demonstrated "Inhibits histamine-, serotonin- and
      noradrenaline-induced smooth muscle contraction" [UniProt:A0A1S4GYH9]. Deep research
      confirms short-form D7s bind "biogenic amines (serotonin/5-HT, histamine,
      epinephrine/norepinephrine)" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].
    supported_by:
      - reference_id: UniProt:A0A1S4GYH9
        supporting_text: >-
          Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)
      - reference_id: PMID:16301315
        supporting_text: >-
          four of these five short D7 proteins and the D7 long form bind serotonin with high
          affinity, as well as histamine and norepinephrine

references:
- id: GO_REF:0000002
  title: Gene Ontology annotation through association of InterPro records with GO terms
  findings: []
- id: GO_REF:0000043
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
  findings: []
- id: GO_REF:0000044
  title: >-
    Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary
    mapping, accompanied by conservative changes to GO terms applied by UniProt
  findings: []
- id: PMID:16301315
  title: Function and evolution of a mosquito salivary protein family
  findings:
    - statement: D7 short proteins bind serotonin, histamine and norepinephrine with high affinity
      supporting_text: >-
        four of these five short D7 proteins and the D7 long form bind serotonin with high
        affinity, as well as histamine and norepinephrine
    - statement: Scavenging host amines antagonizes vasoconstriction and platelet aggregation
      supporting_text: >-
        Scavenging of host amines would antagonize their vasoconstrictor, platelet-aggregating,
        and pain-inducing properties
- id: PMID:17913537
  title: >-
    Antibody response against saliva antigens of Anopheles gambiae and Aedes aegypti
    in travellers in tropical Africa
  findings:
    - statement: D7r3 was identified in female Anopheles gambiae saliva by mass spectrometry
      supporting_text: >-
        A proteomic and immunoproteomic analysis of anopheles and Aedes saliva allowed for
        the identification of some antigens that were recognized by most of the exposed
        individuals
- id: PMID:11841502
  title: >-
    A cluster of four D7-related genes is expressed in the salivary glands of the African
    malaria vector Anopheles gambiae
  findings:
    - statement: D7r genes are expressed in adult female salivary glands
      supporting_text: >-
        Four genes expressed in the Anopheles gambiae adult female salivary glands and similar
        in sequence to the Aedes aegypti D7 gene were identified
- id: PMID:9990055
  title: >-
    Trapping cDNAs encoding secreted proteins from the salivary glands of the malaria
    vector Anopheles gambiae
  findings:
    - statement: D7-related genes were identified in A. gambiae salivary glands
      supporting_text: >-
        Fragments showing a high degree of similarity to D7 and apyrase, two salivary
        gland-specific genes previously found in Aedes aegypti, were identified
- id: UniProt:A0A1S4GYH9
  title: UniProt entry for D7R3_ANOGA
  findings:
    - statement: D7r3 modulates blood feeding by binding host mediators
      supporting_text: >-
        Modulates blood feeding of female mosquitoes on vertebrate species by binding and
        sequestering different mediators involved in the host response
    - statement: Binds serotonin, noradrenaline, histamine and adrenaline
      supporting_text: >-
        Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)
    - statement: Inhibits smooth muscle contraction
      supporting_text: >-
        Inhibits histamine-, serotonin- and noradrenaline-induced smooth muscle contraction
        (PubMed:16301315)
    - statement: Exhibits vasodilating activity
      supporting_text: Exhibits vasodilating activity (PubMed:16301315)
    - statement: Protein is secreted
      supporting_text: "SUBCELLULAR LOCATION: Secreted"
- id: file:ANOGA/D7r1/D7r1-deep-research-falcon.md
  title: Deep research review of D7 family function and evolution
  findings:
    - statement: D7 proteins function as kratagonists that scavenge host signaling molecules
      supporting_text: >-
        D7 proteins are among the most abundant mosquito salivary proteins and function
        as kratagonists - high-affinity scavengers of host small-molecule inflammatory
        and hemostatic mediators
    - statement: Short-form D7s bind biogenic amines
      supporting_text: >-
        Short-form D7s (including D7r1) predominantly bind biogenic amines (serotonin/5-HT,
        histamine, epinephrine/norepinephrine)

core_functions:
- description: >-
    D7r3 functions as a kratagonist by binding and sequestering host biogenic amines (serotonin,
    histamine, norepinephrine, adrenaline) during blood feeding, thereby preventing vasoconstriction,
    platelet aggregation, and inflammation at the feeding site.
  molecular_function:
    id: GO:0051378
    label: serotonin binding
  directly_involved_in:
    - id: GO:0042311
      label: vasodilation
  locations:
    - id: GO:0005615
      label: extracellular space
  supported_by:
    - reference_id: UniProt:A0A1S4GYH9
      supporting_text: >-
        Modulates blood feeding of female mosquitoes on vertebrate species by binding and
        sequestering different mediators involved in the host response
    - reference_id: PMID:16301315
      supporting_text: >-
        four of these five short D7 proteins and the D7 long form bind serotonin with high
        affinity, as well as histamine and norepinephrine

- description: >-
    D7r3 also binds histamine to prevent host inflammatory responses during blood feeding.
  molecular_function:
    id: GO:0051381
    label: histamine binding
  directly_involved_in:
    - id: GO:0042311
      label: vasodilation
  locations:
    - id: GO:0005615
      label: extracellular space
  supported_by:
    - reference_id: UniProt:A0A1S4GYH9
      supporting_text: >-
        Binds serotonin, noradrenaline, histamine and adrenaline (PubMed:16301315)

suggested_questions:
- question: >-
    What is the binding affinity (Kd) of D7r3 for serotonin vs histamine vs norepinephrine,
    and does it show preference for one over the others?
  experts:
    - Calvo E
    - Ribeiro JM

- question: >-
    Are there functional differences between D7r3 and other short-form D7 proteins (D7r1, D7r2, D7r4)
    in terms of ligand binding specificity or tissue expression?
  experts:
    - Calvo E
    - Mans BJ

suggested_experiments:
- hypothesis: >-
    D7r3 knockout mosquitoes will have reduced blood feeding efficiency due to host hemostatic
    responses
  description: >-
    Generate D7r3 knockout A. gambiae using CRISPR and measure blood meal size, feeding time,
    and feeding success rate compared to wild-type and D7r1 knockout controls
  experiment_type: Gene knockout and feeding assay

- hypothesis: >-
    D7r3 and D7r1 have overlapping but non-identical ligand binding profiles
  description: >-
    Perform quantitative binding assays (isothermal microcalorimetry or surface plasmon resonance)
    comparing D7r3 and D7r1 affinities for serotonin, histamine, norepinephrine, and adrenaline
  experiment_type: Biochemical binding assays