A2FPI7 (TVAG_233530/TVAG_559790) is a 129-amino-acid KilA-N domain-containing protein from Trichomonas vaginalis. The KilA-N domain (Pfam PF04383) was originally identified in bacteriophage proteins associated with DNA-binding and transcriptional regulatory functions, and is structurally related to the APSES DNA-binding domain found in fungal transcription factors. T. vaginalis harbors numerous laterally transferred genes of viral and bacterial origin in its unusually large genome (~160 Mb). Based on conserved domain architecture, A2FPI7 is most likely a DNA-binding protein with a possible role in transcriptional regulation. No direct experimental characterization of this protein has been reported; the protein existence level is PE4 (Predicted), and no GO annotations are present in GOA.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
|
GO:0003677
DNA binding
|
ISM
file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md |
NEW |
Summary: DNA binding is inferred from the KilA-N domain (PF04383/IPR017880), which belongs to the KilA-N/APSES helix-turn-helix superfamily. This domain has been experimentally validated as a DNA-binding domain in fungal APSES transcription factors and bacteriophage regulatory proteins. ProtNLM2 also independently predicted this term. No direct experimental evidence exists for A2FPI7.
Reason: Domain-based inference strongly supports DNA binding as the primary molecular function; independently predicted by ProtNLM2.
Supporting Evidence:
file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
the strongest evidence-based inference is therefore that its primary molecular role is likely DNA binding, with possible participation in gene-expression control
|
|
GO:0005634
nucleus
|
ISM
file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md |
NEW |
Summary: Nuclear localization is inferred from the predicted DNA-binding function. DNA-binding transcriptional regulators characteristically function in the nucleus. However, T. vaginalis has an atypical nuclear architecture and this localization has not been experimentally verified for A2FPI7.
Reason: Inferred localization based on predicted DNA-binding function; awaits experimental confirmation.
Supporting Evidence:
file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
The most likely cellular localization for a DNA-binding regulatory protein is the nucleus, but this remains an inference from domain architecture
|
Q: Is A2FPI7 (TVAG_233530) expressed at the protein level in T. vaginalis, and if so, does it localize to the nucleus? T. vaginalis has an atypical nuclear architecture, and confirming nuclear localization would strengthen the transcription factor hypothesis.
Q: Does A2FPI7 bind DNA in vitro (e.g., via EMSA or ChIP-seq), and if so, does it show sequence-specific binding similar to fungal APSES domain proteins?
Q: Is the TVAG_233530 locus part of a laterally transferred genomic island of viral origin, and are there paralogous KilA-N domain proteins in the T. vaginalis genome with overlapping or distinct functions?
Experiment: Express recombinant A2FPI7 and perform electrophoretic mobility shift assay (EMSA) with random and designed DNA probes to test for DNA-binding activity. Include a KilA-N domain deletion mutant as a negative control.
Hypothesis: A2FPI7 binds double-stranded DNA via its KilA-N domain.
Type: EMSA
Experiment: Tag A2FPI7 with GFP or an epitope tag, express it in T. vaginalis, and determine subcellular localization by fluorescence microscopy with DAPI co-staining for nuclear DNA.
Hypothesis: A2FPI7 localizes to the T. vaginalis nucleus.
Type: fluorescence microscopy
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.
Warning: no contexts were retrieved, so this answer is not grounded in evidence but is instead a direct response from the agent model.
No directly citable, paper-based evidence for A2FPI7 from Trichomonas vaginalis could be retrieved due to persistent technical issues with evidence retrieval. However, based on UniProt annotation and universally accepted domain biology, the protein A2FPI7 (KilA-N domain-containing protein, TVAG_233530/TVAG_559790) is most likely inferred to be a DNA-binding transcriptional regulatory protein. This function is based on the presence of a KilA-N domain (PF04383, IPR017880) and a KilA/APSES_HTH domain (IPR018004); both domains are well-established DNA-binding motifs in transcription factors in diverse eukaryotes and viruses. There is no evidence supporting an enzymatic, structural, or transport role. The actual biological processes, signaling pathways, and direct molecular targets of A2FPI7 remain experimentally uncharacterized in T. vaginalis. All functional assignments here are reasoned, domain-based inferences and should be experimentally validated in the future. For more, see UniProt: https://www.uniprot.org/uniprot/A2FPI7.
id: A2FPI7
gene_symbol: A2FPI7
aliases:
- TVAG_233530
- TVAG_559790
product_type: PROTEIN
status: DRAFT
taxon:
id: NCBITaxon:412133
label: Trichomonas vaginalis (strain ATCC PRA-98 / G3)
description: >-
A2FPI7 (TVAG_233530/TVAG_559790) is a 129-amino-acid KilA-N domain-containing
protein from Trichomonas vaginalis. The KilA-N domain (Pfam PF04383) was
originally identified in bacteriophage proteins associated with DNA-binding
and transcriptional regulatory functions, and is structurally related to the
APSES DNA-binding domain found in fungal transcription factors. T. vaginalis
harbors numerous laterally transferred genes of viral and bacterial origin in
its unusually large genome (~160 Mb). Based on conserved domain architecture,
A2FPI7 is most likely a DNA-binding protein with a possible role in
transcriptional regulation. No direct experimental characterization of this
protein has been reported; the protein existence level is PE4 (Predicted),
and no GO annotations are present in GOA.
existing_annotations:
- term:
id: GO:0003677
label: DNA binding
evidence_type: ISM
original_reference_id: file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
review:
summary: >-
DNA binding is inferred from the KilA-N domain (PF04383/IPR017880), which
belongs to the KilA-N/APSES helix-turn-helix superfamily. This domain has been
experimentally validated as a DNA-binding domain in fungal APSES transcription
factors and bacteriophage regulatory proteins. ProtNLM2 also independently
predicted this term. No direct experimental evidence exists for A2FPI7.
action: NEW
reason: >-
Domain-based inference strongly supports DNA binding as the primary molecular
function; independently predicted by ProtNLM2.
supported_by:
- reference_id: file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
supporting_text: >-
the strongest evidence-based inference is therefore that its primary molecular
role is likely DNA binding, with possible participation in gene-expression control
- term:
id: GO:0005634
label: nucleus
evidence_type: ISM
original_reference_id: file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
review:
summary: >-
Nuclear localization is inferred from the predicted DNA-binding function.
DNA-binding transcriptional regulators characteristically function in the
nucleus. However, T. vaginalis has an atypical nuclear architecture and
this localization has not been experimentally verified for A2FPI7.
action: NEW
reason: >-
Inferred localization based on predicted DNA-binding function; awaits
experimental confirmation.
supported_by:
- reference_id: file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
supporting_text: >-
The most likely cellular localization for a DNA-binding regulatory protein
is the nucleus, but this remains an inference from domain architecture
references:
- id: PMID:17218520
title: "Draft genome sequence of the sexually transmitted pathogen Trichomonas vaginalis"
findings:
- statement: >-
The T. vaginalis genome (~160 Mb) is among the largest of any unicellular
eukaryote; extensive lateral gene transfer from bacteria and viruses has
contributed to its gene complement.
- id: file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
title: "Deep research report on A2FPI7 (Falcon/Edison Scientific Literature)"
findings:
- statement: >-
No primary publication directly characterizing A2FPI7 was found. Domain-based
inference supports classification as a probable DNA-binding regulatory protein
based on the KilA-N/APSES_HTH domain architecture.
- statement: >-
The KilA-N domain is a conserved DNA-binding domain originally defined in large
DNA viruses and later recognized in cellular proteins; fungal APSES
transcription-factor DNA-binding domains are homologous to KilA-N.
- id: file:TRIV3/A2FPI7/A2FPI7-uniprot.txt
title: "UniProt entry for A2FPI7 (KilA-N domain-containing protein)"
findings:
- statement: >-
A2FPI7 is a 129-amino-acid predicted protein containing a single KilA-N domain
(residues 19-124) identified by PROSITE PS51301. Protein existence is PE4
(Predicted). The protein is part of the T. vaginalis strain G3 reference proteome.
core_functions:
- description: >-
A2FPI7 is predicted to bind DNA based on the presence of a KilA-N domain (PF04383),
which belongs to the KilA-N/APSES helix-turn-helix superfamily. This domain has
been experimentally demonstrated to mediate sequence-specific DNA binding in fungal
APSES transcription factors and in bacteriophage regulatory proteins. No direct
experimental evidence exists for A2FPI7 specifically; this annotation is a
domain-based inference.
molecular_function:
id: GO:0003677
label: DNA binding
locations:
- id: GO:0005634
label: nucleus
supported_by:
- reference_id: file:TRIV3/A2FPI7/A2FPI7-deep-research-falcon.md
supporting_text: >-
the strongest evidence-based inference is therefore that its primary molecular
role is likely DNA binding, with possible participation in gene-expression control
- reference_id: file:TRIV3/A2FPI7/A2FPI7-uniprot.txt
supporting_text: >-
RecName: Full=KilA-N domain-containing protein {ECO:0000259|PROSITE:PS51301}
suggested_questions:
- question: >-
Is A2FPI7 (TVAG_233530) expressed at the protein level in T. vaginalis, and
if so, does it localize to the nucleus? T. vaginalis has an atypical nuclear
architecture, and confirming nuclear localization would strengthen the
transcription factor hypothesis.
- question: >-
Does A2FPI7 bind DNA in vitro (e.g., via EMSA or ChIP-seq), and if so, does
it show sequence-specific binding similar to fungal APSES domain proteins?
- question: >-
Is the TVAG_233530 locus part of a laterally transferred genomic island of
viral origin, and are there paralogous KilA-N domain proteins in the
T. vaginalis genome with overlapping or distinct functions?
suggested_experiments:
- hypothesis: >-
A2FPI7 binds double-stranded DNA via its KilA-N domain.
description: >-
Express recombinant A2FPI7 and perform electrophoretic mobility shift assay
(EMSA) with random and designed DNA probes to test for DNA-binding activity.
Include a KilA-N domain deletion mutant as a negative control.
experiment_type: EMSA
- hypothesis: >-
A2FPI7 localizes to the T. vaginalis nucleus.
description: >-
Tag A2FPI7 with GFP or an epitope tag, express it in T. vaginalis, and
determine subcellular localization by fluorescence microscopy with DAPI
co-staining for nuclear DNA.
experiment_type: fluorescence microscopy