sec11

UniProt ID: Q4WYF4
Organism: Aspergillus fumigatus Af293
Review Status: COMPLETE
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Gene Description

Sec11 is the catalytic subunit of the Aspergillus fumigatus endoplasmic reticulum signal peptidase complex. It is a type II ER membrane protease in the peptidase S26B family and cleaves N-terminal signal peptides from secretory-pathway precursor proteins, including the cell-wall 1,3-beta-glucanosyltransferase Gel1.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0004252 serine-type endopeptidase activity
IEA
GO_REF:0000002
ACCEPT
Summary: InterPro identifies Sec11 as a signal peptidase I/S26 serine-protease catalytic subunit, so the serine-type endopeptidase mapping is sound.
Reason: GO:0004252 records the conserved serine-protease chemistry of fungal Sec11, and A. fumigatus AfSec1/sec11 has target-specific support for signal peptidase activity on Gel1. The serine-endopeptidase and signal peptidase rows are therefore complementary rather than redundant.
Supporting Evidence:
PMID:36657388
These results suggest that AfSec1 exerts signal peptidase activity on its target Gel1 and has an important role in fungal pathogenesis.
GO:0005783 endoplasmic reticulum
IEA
GO_REF:0000107
ACCEPT
Summary: The ER localization transferred from Saccharomyces cerevisiae Sec11 is consistent with fungal Sec11 acting in the ER membrane signal peptidase complex.
Reason: Sec11 is an ER signal peptidase complex subunit. Although ER membrane is more precise, the broader endoplasmic reticulum term remains biologically correct and informative as a compartment-level localization for this eukaryotic signal peptidase.
Propagation Review
Root cause: NO FAILURE CORE
Sources checked:
UniProtKB:P15367 · Saccharomyces cerevisiae SEC11 SUPPORTS TRANSFER
S. cerevisiae SEC11 is the direct fungal ortholog used for the EnsemblFungi transfer and supports ER localization for the catalytic signal peptidase complex subunit.
Supporting Evidence:
file:genes/ASPFU/sec11/sec11-uniprot.txt
SUBCELLULAR LOCATION: Endoplasmic reticulum membrane
GO:0005787 signal peptidase complex
IBA
GO_REF:0000033
ACCEPT
Summary: PAINT places signal peptidase complex membership at the eukaryotic PTN000086750 node, and A. fumigatus Sec11 sits in the fungal Sec11 subfamily that inherited this complex role.
Reason: PTN000086750 is scoped to Eukaryota for signal peptidase complex membership, matching the conserved ER signal peptidase complex in which Sec11 supplies the catalytic subunit. No A. fumigatus-specific loss or divergence is evident.
Propagation Review
Root cause: NO FAILURE CORE
Sources checked:
PANTHER:PTN000086750 SUPPORTS TRANSFER
The PAINT node assigns signal peptidase complex membership within Eukaryota, the clade containing A. fumigatus Sec11.
Supporting Evidence:
file:interpro/panther/PTHR10806/PTHR10806-paint.tsv
PTHR10806 PTN000086750 GO:0005787 C IBD false
GO:0005787 signal peptidase complex
IEA
GO_REF:0000107
ACCEPT
Summary: Transfer of signal peptidase complex membership from budding-yeast Sec11 is exact for the conserved fungal catalytic subunit.
Reason: A. fumigatus Sec11 and S. cerevisiae Sec11 are fungal members of PANTHER subfamily PTHR10806:SF6, and Sec11 is expected to be the catalytic subunit of the ER signal peptidase complex in both species.
Propagation Review
Root cause: NO FAILURE CORE
Sources checked:
UniProtKB:P15367 · Saccharomyces cerevisiae SEC11 SUPPORTS TRANSFER
The source and target are both fungal Sec11 proteins in PTHR10806:SF6, so signal peptidase complex membership transfers cleanly.
Supporting Evidence:
file:genes/ASPFU/sec11/sec11-uniprot.txt
Component of the signal peptidase complex (SPC) composed of a catalytic subunit SEC11
GO:0005789 endoplasmic reticulum membrane
IEA
GO_REF:0000044
ACCEPT
Summary: UniProtKB-SubCell maps the curated endoplasmic-reticulum membrane localization of Sec11 to the correct GO cellular component.
Reason: The ER membrane is the expected site of the signal peptidase complex that cleaves signal peptides from proteins entering the secretory pathway, and is the precise membrane location for Sec11.
Supporting Evidence:
file:genes/ASPFU/sec11/sec11-uniprot.txt
SUBCELLULAR LOCATION: Endoplasmic reticulum membrane
GO:0005789 endoplasmic reticulum membrane
ISS
GO_REF:0000024
ACCEPT
Summary: Manual similarity transfer from S. cerevisiae Sec11 supports ER membrane localization for A. fumigatus Sec11.
Reason: The fungal Sec11 orthologs are conserved ER membrane catalytic subunits of the signal peptidase complex; transferring ER membrane localization from the characterized S. cerevisiae protein is therefore appropriate.
Propagation Review
Root cause: NO FAILURE CORE
Sources checked:
UniProtKB:P15367 · Saccharomyces cerevisiae SEC11 SUPPORTS TRANSFER
Yeast SEC11 supports the conserved ER membrane location of fungal Sec11 signal peptidase catalytic subunits.
Supporting Evidence:
file:genes/ASPFU/sec11/sec11-uniprot.txt
SUBCELLULAR LOCATION: Endoplasmic reticulum membrane
GO:0008233 peptidase activity
IBA
GO_REF:0000033
TOO GENERAL
Summary: The root PAINT node supports inherited peptidase activity, but the exact activity of A. fumigatus Sec11 is signal peptidase activity.
Reason: PTN000086749 places generic peptidase activity at the PTHR10806 root. This is true for A. fumigatus Sec11, but accepted GO:0009003 rows and the Gel1 processing experiment identify the precise Sec11 activity as signal peptidase activity.
Propagation Review
Root cause: TERM SCOPING PROBLEM
Failure modes: GRANULARITY MISMATCH
Sources checked:
PANTHER:PTN000086749 SUPPORTS TRANSFER
The root IBD correctly captures conserved peptide-bond hydrolysis but is less specific than the signal peptidase activity known for Sec11.
Supporting Evidence:
PMID:36657388
These results suggest that AfSec1 exerts signal peptidase activity on its target Gel1 and has an important role in fungal pathogenesis.
GO:0008233 peptidase activity
IEA
GO_REF:0000120
TOO GENERAL
Summary: UniProt's combined electronic peptidase call is true but generic relative to the accepted signal peptidase activity rows.
Reason: A. fumigatus Sec11 is a peptidase, but it is specifically an ER signal peptidase catalytic subunit. Retaining generic peptidase activity would duplicate the accepted signal peptidase activity annotation at lower specificity.
Supporting Evidence:
PMID:36657388
These results suggest that AfSec1 exerts signal peptidase activity on its target Gel1 and has an important role in fungal pathogenesis.
GO:0009003 signal peptidase activity
IEA
GO_REF:0000120
ACCEPT
Summary: The EC/ARBA electronic annotation matches Sec11's experimentally supported signal peptidase activity.
Reason: AfSec1/sec11 promoter depletion caused accumulation of nonprocessed Gel1, while mature Gel1 was restored in wild-type and promoter-complemented strains, directly supporting signal peptide cleavage by A. fumigatus Sec11.
Supporting Evidence:
PMID:36657388
The nonprocessed form of Gel1 was identified in the AfSec1-ΔP strain, which lacked the promoter, but mature forms of Gel1 were found in the wild-type and in AfSec1-ΔP/P, which was the promoter complementation strain.
GO:0009003 signal peptidase activity
ISS
GO_REF:0000024
ACCEPT
Summary: Manual similarity transfer from S. cerevisiae Sec11 is supported by conserved fungal Sec11 membership and target-specific A. fumigatus Gel1 processing data.
Reason: S. cerevisiae and A. fumigatus Sec11 are fungal PTHR10806:SF6 signal peptidase catalytic subunits, and the direct A. fumigatus promoter-deletion experiment confirms signal peptidase activity on Gel1.
Propagation Review
Root cause: NO FAILURE CORE
Sources checked:
UniProtKB:P15367 · Saccharomyces cerevisiae SEC11 SUPPORTS TRANSFER
Yeast SEC11 supports the same exact signal peptidase activity now verified for A. fumigatus AfSec1/sec11.
Supporting Evidence:
PMID:36657388
The nonprocessed form of Gel1 was identified in the AfSec1-ΔP strain, which lacked the promoter, but mature forms of Gel1 were found in the wild-type and in AfSec1-ΔP/P, which was the promoter complementation strain.
GO:0016020 membrane
IEA
GO_REF:0000002
TOO GENERAL
Summary: Sec11 is membrane-associated, but endoplasmic reticulum membrane is the more specific accepted localization.
Reason: The InterPro membrane inference is correct for a type II ER membrane signal peptidase catalytic subunit, but accepted GO:0005789 rows already capture the specific membrane where Sec11 functions.
GO:0045047 protein targeting to ER
IEA
GO_REF:0000107
REMOVE
Summary: Protein targeting to ER is an upstream signal-recognition and targeting process, not the proteolytic signal-peptide removal catalyzed by Sec11.
Reason: Sec11 executes the post-targeting signal peptide cleavage step within the ER signal peptidase complex. Its substrate signal peptides direct precursors to the ER; Sec11 removes those peptides after targeting and translocation, so the EnsemblFungi transfer overstates Sec11's role.
Propagation Review
Root cause: TERM SCOPING PROBLEM
Failure modes: ROLE CONFLATION
Sources checked:
UniProtKB:P15367 · Saccharomyces cerevisiae SEC11 SUPPORTS SOURCE BUT NOT TARGET
The yeast source is the orthologous catalytic subunit, but this process term captures the upstream targeting role of the signal sequence rather than Sec11's cleavage step.
GO:0051604 protein maturation
IBA
GO_REF:0000033
MODIFY
Summary: PTN000086750 correctly places eukaryotic Sec11 signal-peptide cleavage in protein maturation, but the row can be refined to protein processing.
Reason: Signal peptide cleavage converts a secretory precursor into a mature protein, so the eukaryotic PTN000086750 IBD to GO:0051604 protein maturation captures the conserved Sec11 biological process at the right scope for A. fumigatus. GO:0016485 protein processing is the live process term for the proteolytic SPC reaction.
Propagation Review
Root cause: TERM SCOPING PROBLEM
Failure modes: GRANULARITY MISMATCH
Sources checked:
PANTHER:PTN000086750 SUPPORTS TRANSFER
PTN000086750 correctly supports a eukaryotic Sec11 protein-maturation process, but the gene-level row can be refined to the live protein processing term for SPC-catalyzed signal peptide cleavage.
Proposed replacements: protein processing
Supporting Evidence:
PMID:36657388
The nonprocessed form of Gel1 was identified in the AfSec1-ΔP strain, which lacked the promoter, but mature forms of Gel1 were found in the wild-type and in AfSec1-ΔP/P, which was the promoter complementation strain.
GO:0051604 protein maturation
IEA
GO_REF:0000120
MODIFY
Summary: UniProt's combined electronic protein-maturation annotation matches Sec11's role in signal peptide cleavage but is too broad for the specific proteolytic processing reaction.
Reason: Sec11 promotes maturation of secretory precursors by cleaving their N-terminal signal peptides, the same conserved function captured by the PAINT Eukaryota node. GO:0016485 protein processing is the live process term for the signal-peptide proteolysis carried out by Sec11.
Proposed replacements: protein processing
Supporting Evidence:
PMID:36657388
The nonprocessed form of Gel1 was identified in the AfSec1-ΔP strain, which lacked the promoter, but mature forms of Gel1 were found in the wild-type and in AfSec1-ΔP/P, which was the promoter complementation strain.

Core Functions

Sec11 cleaves N-terminal signal peptides from secretory precursor proteins as the catalytic subunit of the ER signal peptidase complex.

Molecular Function:
signal peptidase activity
Directly Involved In:
Supporting Evidence:
  • PMID:36657388
    These results suggest that AfSec1 exerts signal peptidase activity on its target Gel1 and has an important role in fungal pathogenesis.

References

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📚 Additional Documentation

Notes

(sec11-notes.md)

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