BtuE (XCC4213) is a predicted glutathione peroxidase-family protein in Xanthomonas campestris pv. campestris. The protein contains a conserved glutathione peroxidase domain (IPR000889, PF00255) and a thioredoxin-like fold (IPR036249), with a predicted active-site residue at position 37. As a member of the glutathione peroxidase family, BtuE is expected to catalyze the reduction of hydrogen peroxide and organic hydroperoxides using glutathione or a thiol-based reductant, thereby protecting the cell from oxidative damage. No direct experimental characterization of this protein in X. campestris has been reported; functional inference is based entirely on conserved domain architecture and family membership.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
|
GO:0034599
cellular response to oxidative stress
|
IBA
GO_REF:0000033 |
ACCEPT |
Summary: ACCEPT. Phylogenetic inference from orthologs in multiple organisms supports involvement of glutathione peroxidase-family proteins in cellular response to oxidative stress.
Reason: This IBA annotation is derived from phylogenetic inference (PANTHER) across a set of experimentally characterized orthologs from diverse model organisms including yeast (SGD), mouse (MGI), worm (WB), and fission yeast (PomBase). The conserved domain architecture of Q8P365 is fully consistent with glutathione peroxidase family membership, and the broader literature supports that bacterial GPx-family proteins participate in oxidative stress defense. While no X. campestris-specific experiment has been reported, the phylogenetic evidence is well-grounded.
Supporting Evidence:
file:XANCP/Q8P365/Q8P365-uniprot.txt
Belongs to the glutathione peroxidase family.
file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
bacterial glutathione peroxidases generally function in peroxide detoxification, reducing hydrogen peroxide and/or organic hydroperoxides and thereby contributing to oxidative-stress defense.
|
|
GO:0004601
peroxidase activity
|
IEA
GO_REF:0000002 |
MODIFY |
Summary: MODIFY. The annotation to the broad peroxidase activity term is correct but imprecise; glutathione peroxidase activity (GO:0004602) is more appropriate given the domain and family assignment.
Reason: InterPro maps IPR000889 (Glutathione_peroxidase) to the general peroxidase activity term GO:0004601. However, the protein is specifically classified in the glutathione peroxidase family with the GSHPx Pfam domain (PF00255) and the GPX active site motif (IPR029759). The more specific term GO:0004602 (glutathione peroxidase activity) better reflects the predicted enzymatic function. This is a standard InterPro2GO mapping limitation where the mapping is broader than the family assignment warrants.
Proposed replacements:
glutathione peroxidase activity
Supporting Evidence:
file:XANCP/Q8P365/Q8P365-uniprot.txt
RecName: Full=Glutathione peroxidase {ECO:0000256|RuleBase:RU000499};
file:XANCP/Q8P365/Q8P365-uniprot.txt
Belongs to the glutathione peroxidase family.
file:XANCP/Q8P365/Q8P365-uniprot.txt
Pfam; PF00255; GSHPx; 1.
|
|
GO:0006979
response to oxidative stress
|
IEA
GO_REF:0000002 |
KEEP AS NON CORE |
Summary: KEEP_AS_NON_CORE. This is a broader parent of GO:0034599 (cellular response to oxidative stress) which is already annotated via IBA. Biologically consistent but redundant with the more specific IBA annotation.
Reason: GO:0006979 (response to oxidative stress) is an ancestor of GO:0034599 (cellular response to oxidative stress). The IBA annotation to the more specific child term already captures the biology. Retaining this broader IEA annotation is not incorrect but adds no new information; it is kept as non-core.
Supporting Evidence:
file:XANCP/Q8P365/Q8P365-uniprot.txt
Belongs to the glutathione peroxidase family.
file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
The domain architecture of Q8P365 is consistent with this interpretation, but this should be treated as an inference rather than a confirmed species-specific function.
|
|
GO:0098869
cellular oxidant detoxification
|
IEA
GO_REF:0000108 |
ACCEPT |
Summary: ACCEPT. Logical inference from peroxidase activity to cellular oxidant detoxification is well-founded for a glutathione peroxidase.
Reason: This annotation is derived from GO logical inference (GO_REF:0000108): proteins with peroxidase activity (GO:0004601) are inferred to be involved in cellular oxidant detoxification (GO:0098869). For a glutathione peroxidase-family protein, this inference is biologically sound. GPx enzymes reduce reactive oxygen species and organic hydroperoxides, which is precisely what cellular oxidant detoxification describes. This represents the core biological process role of the enzyme.
Supporting Evidence:
file:XANCP/Q8P365/Q8P365-uniprot.txt
RecName: Full=Glutathione peroxidase {ECO:0000256|RuleBase:RU000499};
file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
a predicted glutathione peroxidase-family antioxidant enzyme likely involved in cellular peroxide defense.
|
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.
The available evidence supports identification of btuE (UniProt: Q8P365) in Xanthomonas campestris pv. campestris strain ATCC 33913 as a predicted glutathione peroxidase-family protein based on curated protein annotation and conserved domain/family assignment in public resources, including UniProt: https://www.uniprot.org/uniprotkb/Q8P365/entry. > At present, no direct organism-specific experimental literature evidence was found that characterizes the biochemical activity, substrate specificity, subcellular localization, physiological role, mutant phenotype, or pathway context of this specific protein in X. campestris pv. campestris. > Therefore, the functional annotation should be interpreted conservatively as a homology- and domain-based prediction, not as an experimentally validated species-specific conclusion. > In practical terms, the strongest current statement is that Q8P365 is consistent with a bacterial glutathione peroxidase-like antioxidant enzyme, while the precise in vivo function of btuE in this organism remains unresolved.
Blockquote: This blockquote summarizes the current evidence base for btuE (Q8P365) and clearly separates database-supported annotation from missing organism-specific experimental validation. It is useful for a cautious functional annotation report.
Primary database reference:
- UniProt entry for Q8P365: https://www.uniprot.org/uniprotkb/Q8P365/entry (accessed 2024-07-04)
For future use, check UniProt and related annotation sources for updates as new research may provide direct experimental validation.
id: Q8P365
gene_symbol: btuE
product_type: PROTEIN
status: DRAFT
taxon:
id: NCBITaxon:190485
label: Xanthomonas campestris pv. campestris (strain ATCC 33913 / DSM 3586 / NCPPB
528 / LMG 568 / P 25)
description: >-
BtuE (XCC4213) is a predicted glutathione peroxidase-family protein in
Xanthomonas campestris pv. campestris. The protein contains a conserved
glutathione peroxidase domain (IPR000889, PF00255) and a thioredoxin-like
fold (IPR036249), with a predicted active-site residue at position 37. As a
member of the glutathione peroxidase family, BtuE is expected to catalyze the
reduction of hydrogen peroxide and organic hydroperoxides using glutathione or
a thiol-based reductant, thereby protecting the cell from oxidative damage.
No direct experimental characterization of this protein in X. campestris has
been reported; functional inference is based entirely on conserved domain
architecture and family membership.
existing_annotations:
- term:
id: GO:0034599
label: cellular response to oxidative stress
evidence_type: IBA
original_reference_id: GO_REF:0000033
qualifier: involved_in
review:
summary: >-
ACCEPT. Phylogenetic inference from orthologs in multiple organisms
supports involvement of glutathione peroxidase-family proteins in cellular
response to oxidative stress.
action: ACCEPT
reason: >-
This IBA annotation is derived from phylogenetic inference (PANTHER)
across a set of experimentally characterized orthologs from diverse model
organisms including yeast (SGD), mouse (MGI), worm (WB), and fission
yeast (PomBase). The conserved domain architecture of Q8P365 is fully
consistent with glutathione peroxidase family membership, and the broader
literature supports that bacterial GPx-family proteins participate in
oxidative stress defense. While no X. campestris-specific experiment has
been reported, the phylogenetic evidence is well-grounded.
supported_by:
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: Belongs to the glutathione peroxidase family.
- reference_id: file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
supporting_text: >-
bacterial glutathione peroxidases generally function in peroxide
detoxification, reducing hydrogen peroxide and/or organic hydroperoxides
and thereby contributing to oxidative-stress defense.
- term:
id: GO:0004601
label: peroxidase activity
evidence_type: IEA
original_reference_id: GO_REF:0000002
qualifier: enables
review:
summary: >-
MODIFY. The annotation to the broad peroxidase activity term is correct
but imprecise; glutathione peroxidase activity (GO:0004602) is more
appropriate given the domain and family assignment.
action: MODIFY
reason: >-
InterPro maps IPR000889 (Glutathione_peroxidase) to the general
peroxidase activity term GO:0004601. However, the protein is specifically
classified in the glutathione peroxidase family with the GSHPx Pfam domain
(PF00255) and the GPX active site motif (IPR029759). The more specific
term GO:0004602 (glutathione peroxidase activity) better reflects the
predicted enzymatic function. This is a standard InterPro2GO mapping
limitation where the mapping is broader than the family assignment
warrants.
proposed_replacement_terms:
- id: GO:0004602
label: glutathione peroxidase activity
supported_by:
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: "RecName: Full=Glutathione peroxidase {ECO:0000256|RuleBase:RU000499};"
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: Belongs to the glutathione peroxidase family.
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: Pfam; PF00255; GSHPx; 1.
- term:
id: GO:0006979
label: response to oxidative stress
evidence_type: IEA
original_reference_id: GO_REF:0000002
qualifier: involved_in
review:
summary: >-
KEEP_AS_NON_CORE. This is a broader parent of GO:0034599 (cellular
response to oxidative stress) which is already annotated via IBA.
Biologically consistent but redundant with the more specific IBA
annotation.
action: KEEP_AS_NON_CORE
reason: >-
GO:0006979 (response to oxidative stress) is an ancestor of GO:0034599
(cellular response to oxidative stress). The IBA annotation to the more
specific child term already captures the biology. Retaining this broader
IEA annotation is not incorrect but adds no new information; it is kept
as non-core.
supported_by:
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: Belongs to the glutathione peroxidase family.
- reference_id: file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
supporting_text: >-
The domain architecture of Q8P365 is consistent with this
interpretation, but this should be treated as an inference rather than a
confirmed species-specific function.
- term:
id: GO:0098869
label: cellular oxidant detoxification
evidence_type: IEA
original_reference_id: GO_REF:0000108
qualifier: involved_in
review:
summary: >-
ACCEPT. Logical inference from peroxidase activity to cellular oxidant
detoxification is well-founded for a glutathione peroxidase.
action: ACCEPT
reason: >-
This annotation is derived from GO logical inference (GO_REF:0000108):
proteins with peroxidase activity (GO:0004601) are inferred to be
involved in cellular oxidant detoxification (GO:0098869). For a
glutathione peroxidase-family protein, this inference is biologically
sound. GPx enzymes reduce reactive oxygen species and organic
hydroperoxides, which is precisely what cellular oxidant detoxification
describes. This represents the core biological process role of the enzyme.
supported_by:
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: "RecName: Full=Glutathione peroxidase {ECO:0000256|RuleBase:RU000499};"
- reference_id: file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
supporting_text: >-
a predicted glutathione peroxidase-family antioxidant enzyme likely
involved in cellular peroxide defense.
references:
- id: GO_REF:0000002
title: Gene Ontology annotation through association of InterPro records with GO
terms
findings: []
- id: GO_REF:0000033
title: Annotation inferences using phylogenetic trees
findings: []
- id: GO_REF:0000108
title: Automatic assignment of GO terms using logical inference, based on on inter-ontology
links
findings: []
- id: PMID:12024217
title: Comparison of the genomes of two Xanthomonas pathogens with differing host
specificities
findings:
- statement: >-
Genome sequence paper for X. campestris pv. campestris strain ATCC 33913.
Reports the gene XCC4213 (btuE) as part of the complete genome but does
not provide functional characterization.
- id: file:XANCP/Q8P365/Q8P365-uniprot.txt
title: UniProt record for Q8P365 (btuE)
findings:
- statement: >-
UniProt classifies Q8P365 as a glutathione peroxidase belonging to the
glutathione peroxidase family, with an active site at position 37 and
conserved GSHPx, thioredoxin-like fold, and GPX active site domains.
- id: file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
title: Falcon deep research for btuE (Q8P365)
findings:
- statement: >-
Falcon deep research found no organism-specific experimental literature
for Q8P365/btuE in X. campestris. All functional inference is based on
domain architecture and glutathione peroxidase family membership.
Bacterial GPx-family proteins generally function in peroxide
detoxification and oxidative stress defense.
core_functions:
- description: >-
Predicted glutathione peroxidase that reduces hydrogen peroxide and organic
hydroperoxides using glutathione or a thiol reductant, protecting the cell
from oxidative damage.
molecular_function:
id: GO:0004602
label: glutathione peroxidase activity
directly_involved_in:
- id: GO:0098869
label: cellular oxidant detoxification
supported_by:
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: "RecName: Full=Glutathione peroxidase {ECO:0000256|RuleBase:RU000499};"
- reference_id: file:XANCP/Q8P365/Q8P365-uniprot.txt
supporting_text: Belongs to the glutathione peroxidase family.
- reference_id: file:XANCP/Q8P365/Q8P365-deep-research-falcon.md
supporting_text: >-
bacterial glutathione peroxidases generally function in peroxide
detoxification, reducing hydrogen peroxide and/or organic hydroperoxides
and thereby contributing to oxidative-stress defense.