D7L2

Summary: This annotation correctly describes D7L2's function. The protein modulates host hemostatic responses during blood feeding by binding coagulation factors XII and XI and preventing their activation, as well as weakly sequestering leukotrienes. This is a valid BP annotation for the cross-species effect.

Reason: D7L2 clearly modulates processes in the vertebrate host. Per UniProt, it "Modulates blood feeding of female mosquitoes on vertebrate species by binding and sequestering different mediators involved in the host response" and "Exhibits anticoagulant activity targeting the intrinsic coagulation pathway; binds coagulation factors XII and XI, preventing generation of activated FXIIa and FXIa" [UniProt A0A1S4GYJ6]. The GO:0035821 definition "A process in which an organism effects a change in a biological process in another organism" accurately captures this function. PMID:35460690 demonstrates anticoagulant activity through binding host coagulation factors. The annotation was inferred via GO_REF:0000108 from the toxin activity annotation, but the underlying logic is sound for this BP term - binding host coagulation factors does modulate host hemostatic processes.

Summary: This annotation is INCORRECT. It is based solely on structural family membership (PBP/GOBP family via InterPro IPR006170) but does not reflect the actual function of D7L2. The protein binds coagulation factors and weakly binds leukotrienes, not odorants, and has no role in olfaction. D7L2 is expressed in salivary glands, not olfactory tissues.

Reason: D7L2 belongs to the PBP/GOBP structural family (InterPro IPR006170), which led to this IEA annotation via GO_REF:0000002. However, D7 proteins have evolutionarily repurposed this fold for binding host hemostatic/inflammatory mediators in saliva, not odorants in antennae. D7L2 is secreted from female salivary glands during blood feeding [UniProt A0A1S4GYJ6]. The actual molecular functions involve binding coagulation factors XII and XI [PMID:35460690, UniProt A0A1S4GYJ6] and weakly binding leukotrienes B4 and D4 [PMID:35460690, UniProt A0A1S4GYJ6]. The GO:0005549 definition "Binding to an odorant, any substance capable of stimulating the sense of smell" is completely inappropriate - coagulation factors and leukotrienes are not odorants. This is a clear case where structural homology does not predict function. Deep research on the D7 family confirms long-form D7s "bind lipid mediators (cysteinyl leukotrienes; some bind thromboxane A2 analogs) via their N-terminal domain" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md], not odorants.

Summary: This annotation correctly reflects the subcellular localization of D7L2 as a secreted salivary protein.

Reason: D7L2 is a secreted protein with a signal peptide (residues 1-18) [UniProt A0A1S4GYJ6]. It is released into the extracellular space (saliva) during blood feeding. The UniProt entry confirms "SUBCELLULAR LOCATION: Secreted" [UniProt A0A1S4GYJ6]. This is an appropriate CC annotation. D7L2 functions at the host bite site, which is an extracellular location. Deep research on the D7 family confirms salivary D7 proteins are "produced in adult female salivary glands and secreted in saliva at the skin interface during probing/feeding" [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].

Summary: This annotation is an OVER-ANNOTATION. D7L2 does not meet the GO definition of toxin activity, which requires "initiating pathogenesis (leading to an abnormal, generally detrimental state)". D7L2 transiently modulates host coagulation by binding coagulation factors, but does not cause disease or tissue damage. The weak leukotriene binding also does not constitute toxin activity.

Reason: The GO:0090729 definition states: "Interacting selectively with one or more biological molecules in another (target) organism, initiating pathogenesis (leading to an abnormal, generally detrimental state) in the target organism." D7L2 does NOT meet this definition because: (1) It does not initiate pathogenesis - it facilitates feeding, not disease; (2) It does not cause tissue damage - it transiently binds coagulation factors and weakly sequesters leukotrienes; (3) The effect is reversible and temporary; (4) The host returns to normal state after feeding. The UniProt keywords "Blood coagulation cascade inhibiting toxin" and "Hemostasis impairing toxin" that led to this IEA annotation via GO_REF:0000043 are technically inaccurate - anti-hemostatic activity via protein binding is fundamentally different from true toxin activity that causes pathological damage. D7L2's mechanism of binding coagulation factors XII and XI to prevent their activation [PMID:35460690] is a reversible protein-protein interaction, not toxic pathogenesis. Deep research on D7 proteins explicitly describes the mechanism as kratagonism (scavenging host mediators), not toxicity [file:ANOGA/D7r1/D7r1-deep-research-falcon.md].

Summary: D7L2 exhibits anticoagulant activity by binding coagulation factors XII and XI and preventing their activation. This is a well-supported biological process annotation based on experimental evidence from PMID:35460690.

Reason: UniProt states D7L2 "Exhibits anticoagulant activity targeting the intrinsic coagulation pathway; binds coagulation factors XII and XI, preventing generation of activated FXIIa and FXIa (PubMed:35460690)" [UniProt A0A1S4GYJ6]. PMID:35460690 demonstrates that "AngaD7L2 had a dose-dependent anticoagulant effect via the intrinsic coagulation pathway". GO:0030195 definition "Any process that stops, prevents, or reduces the frequency, rate or extent of blood coagulation" accurately describes this function. This is a more accurate BP annotation than inferring from "toxin activity".

Summary: D7L2 binds host coagulation factors XII (both inactive and activated FXIIa) and XI (inactive). While GO:0005515 is a general term, it accurately describes the molecular function. This binding underlies D7L2's anticoagulant activity.

Reason: UniProt confirms D7L2 "Interacts with host coagulation factor XII/F12 (inactive and activated) (PubMed:35460690). Interacts with host coagulation factor XI/F11 (inactive) (PubMed:35460690)" [UniProt A0A1S4GYJ6]. While GO:0005515 is a general MF term, it is appropriate here because D7L2 binds coagulation factors to prevent their activation - this is a protein-protein interaction that underlies the anticoagulant activity. There is no more specific GO term for "coagulation factor binding".