A0A444Z7V7

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0000139 Golgi membrane	IEA GO_REF:0000044	ACCEPT	Summary: Golgi membrane localization is consistent with the biosynthetic trafficking route of CSLD proteins. CESA/CSLD proteins are synthesized in the ER, assembled into complexes in the Golgi, and trafficked to the plasma membrane. The Golgi is a transit compartment rather than the primary site of function. Reason: UniProt subcellular location annotation places this protein at the Golgi apparatus membrane as a multi-pass membrane protein, consistent with CSLD protein biology. The Golgi is where CSL protein complexes are assembled before delivery to the plasma membrane. Supporting Evidence: file:ARAHY/A0A444Z7V7/A0A444Z7V7-uniprot.txt SUBCELLULAR LOCATION: Golgi apparatus membrane file:ARAHY/A0A444Z7V7/A0A444Z7V7-deep-research-falcon.md Individual CESA proteins are transported to the Golgi, where they assemble into cellulose synthase complexes
GO:0005737 cytoplasm	IEA GO_REF:0000117	MARK AS OVER ANNOTATED	Summary: Cytoplasm is an overly broad localization for this integral membrane protein. The protein traverses membranes with multiple transmembrane helices and its catalytic domain faces the cytoplasmic side, but calling it a cytoplasmic protein is misleading. More specific terms (Golgi membrane, plasma membrane, endomembrane system) are already annotated. Reason: ARBA-derived annotation. While the catalytic domain is cytoplasm-facing, the protein is an integral membrane glycosyltransferase with 7 predicted transmembrane helices. Calling it cytoplasmic is uninformative given that more specific membrane localizations are already annotated.
GO:0009409 response to cold	IEA GO_REF:0000117	MARK AS OVER ANNOTATED	Summary: Response to cold is a pleiotropic stress annotation with no clear mechanistic connection to cellulose synthase-like protein function. While cell wall remodeling genes can be transcriptionally responsive to cold stress in plants, this does not establish that cold response is a core or even direct function of this protein. ARBA rules often propagate broad stress-response annotations based on expression patterns in distantly related species. Reason: ARBA-derived annotation. Cold-responsive transcriptional changes in cell wall genes are a secondary consequence of stress-induced growth adjustments, not a direct molecular function of this glycosyltransferase. No specific evidence links CSLD3-type proteins to cold stress response pathways.
GO:0012505 endomembrane system	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: Endomembrane system is a correct but very broad localization. The protein transits through the ER and Golgi (parts of the endomembrane system) during biosynthesis and trafficking to the plasma membrane. This annotation is subsumed by the more specific Golgi membrane annotation. Reason: ARBA-derived annotation. Technically correct since the Golgi is part of the endomembrane system, but redundant with the more specific GO:0000139 (Golgi membrane) annotation.
GO:0016020 membrane	IEA GO_REF:0000002	KEEP AS NON CORE	Summary: Membrane is a very broad localization. The protein is clearly an integral membrane protein with multiple transmembrane helices, but this generic annotation is subsumed by more specific membrane annotations (Golgi membrane). Reason: InterPro-derived annotation from the cellulose synthase domain (IPR005150). Correct but uninformative given more specific membrane annotations already present.
GO:0016760 cellulose synthase (UDP-forming) activity	IEA GO_REF:0000002	MODIFY	Summary: This annotation derives from the InterPro cellulose synthase domain (IPR005150), which covers the entire CESA/CSL superfamily. However, this protein belongs to the CSLD (cellulose synthase-like D) subfamily, not the true CESA subfamily. CSLD proteins have been shown to have mannan synthase and glucomannan synthase activities rather than (or in addition to) cellulose synthase activity. The InterPro2GO mapping is overly specific for CSLD subfamily members. A more appropriate annotation would be beta-1,4-mannan synthase activity or a more general transferase activity term. Reason: The protein is classified in the plant cellulose synthase-like D subfamily per UniProt. CSLD proteins synthesize mannans and glucomannans rather than cellulose. The cellulose synthase (UDP-forming) activity term is a mis-annotation arising from the broad IPR005150 domain covering the entire CESA/CSL superfamily. Proposed replacements: mannan synthase activity
GO:0030244 cellulose biosynthetic process	IEA GO_REF:0000002	MODIFY	Summary: Like the cellulose synthase activity annotation, this process annotation derives from the broad IPR005150 domain mapping. CSLD subfamily proteins are involved in mannan and glucomannan biosynthesis rather than cellulose biosynthesis per se. While CSLD proteins contribute to cell wall biosynthesis, the specific process is hemicellulose (mannan) synthesis, not cellulose synthesis. Reason: CSLD proteins synthesize mannans/glucomannans, which are hemicellulose components, not cellulose. A more appropriate process term would be mannan biosynthetic process or cell wall organization. Proposed replacements: cell wall organization
GO:0051753 mannan synthase activity	IEA GO_REF:0000117	ACCEPT	Summary: Mannan synthase activity is the most appropriate molecular function annotation for a CSLD subfamily protein. CSLD proteins use GDP-mannose as a donor substrate to synthesize beta-1,4-mannan polysaccharides, which are hemicellulose components of the plant cell wall. This ARBA-derived annotation correctly captures the enzymatic activity of CSLD proteins. Reason: CSLD subfamily proteins have been experimentally shown to possess mannan synthase activity in multiple plant species. This is consistent with the protein being classified in the plant cellulose synthase-like D subfamily.

GO Term

Evidence

Action

Reason

GO:0000139 Golgi membrane

IEA
GO_REF:0000044

Summary: Golgi membrane localization is consistent with the biosynthetic trafficking route of CSLD proteins. CESA/CSLD proteins are synthesized in the ER, assembled into complexes in the Golgi, and trafficked to the plasma membrane. The Golgi is a transit compartment rather than the primary site of function.

Reason: UniProt subcellular location annotation places this protein at the Golgi apparatus membrane as a multi-pass membrane protein, consistent with CSLD protein biology. The Golgi is where CSL protein complexes are assembled before delivery to the plasma membrane.

Supporting Evidence:

file:ARAHY/A0A444Z7V7/A0A444Z7V7-uniprot.txt

SUBCELLULAR LOCATION: Golgi apparatus membrane

file:ARAHY/A0A444Z7V7/A0A444Z7V7-deep-research-falcon.md

Individual CESA proteins are transported to the Golgi, where they assemble into cellulose synthase complexes

GO:0005737 cytoplasm

IEA
GO_REF:0000117

MARK AS OVER ANNOTATED

Summary: Cytoplasm is an overly broad localization for this integral membrane protein. The protein traverses membranes with multiple transmembrane helices and its catalytic domain faces the cytoplasmic side, but calling it a cytoplasmic protein is misleading. More specific terms (Golgi membrane, plasma membrane, endomembrane system) are already annotated.

Reason: ARBA-derived annotation. While the catalytic domain is cytoplasm-facing, the protein is an integral membrane glycosyltransferase with 7 predicted transmembrane helices. Calling it cytoplasmic is uninformative given that more specific membrane localizations are already annotated.

GO:0009409 response to cold

IEA
GO_REF:0000117

MARK AS OVER ANNOTATED

Summary: Response to cold is a pleiotropic stress annotation with no clear mechanistic connection to cellulose synthase-like protein function. While cell wall remodeling genes can be transcriptionally responsive to cold stress in plants, this does not establish that cold response is a core or even direct function of this protein. ARBA rules often propagate broad stress-response annotations based on expression patterns in distantly related species.

Reason: ARBA-derived annotation. Cold-responsive transcriptional changes in cell wall genes are a secondary consequence of stress-induced growth adjustments, not a direct molecular function of this glycosyltransferase. No specific evidence links CSLD3-type proteins to cold stress response pathways.

GO:0012505 endomembrane system

IEA
GO_REF:0000117

KEEP AS NON CORE

Summary: Endomembrane system is a correct but very broad localization. The protein transits through the ER and Golgi (parts of the endomembrane system) during biosynthesis and trafficking to the plasma membrane. This annotation is subsumed by the more specific Golgi membrane annotation.

Reason: ARBA-derived annotation. Technically correct since the Golgi is part of the endomembrane system, but redundant with the more specific GO:0000139 (Golgi membrane) annotation.

GO:0016020 membrane

IEA
GO_REF:0000002

KEEP AS NON CORE

Summary: Membrane is a very broad localization. The protein is clearly an integral membrane protein with multiple transmembrane helices, but this generic annotation is subsumed by more specific membrane annotations (Golgi membrane).

Reason: InterPro-derived annotation from the cellulose synthase domain (IPR005150). Correct but uninformative given more specific membrane annotations already present.

GO:0016760 cellulose synthase (UDP-forming) activity

IEA
GO_REF:0000002

MODIFY

Summary: This annotation derives from the InterPro cellulose synthase domain (IPR005150), which covers the entire CESA/CSL superfamily. However, this protein belongs to the CSLD (cellulose synthase-like D) subfamily, not the true CESA subfamily. CSLD proteins have been shown to have mannan synthase and glucomannan synthase activities rather than (or in addition to) cellulose synthase activity. The InterPro2GO mapping is overly specific for CSLD subfamily members. A more appropriate annotation would be beta-1,4-mannan synthase activity or a more general transferase activity term.

Reason: The protein is classified in the plant cellulose synthase-like D subfamily per UniProt. CSLD proteins synthesize mannans and glucomannans rather than cellulose. The cellulose synthase (UDP-forming) activity term is a mis-annotation arising from the broad IPR005150 domain covering the entire CESA/CSL superfamily.

Proposed replacements: mannan synthase activity

GO:0030244 cellulose biosynthetic process

IEA
GO_REF:0000002

MODIFY

Summary: Like the cellulose synthase activity annotation, this process annotation derives from the broad IPR005150 domain mapping. CSLD subfamily proteins are involved in mannan and glucomannan biosynthesis rather than cellulose biosynthesis per se. While CSLD proteins contribute to cell wall biosynthesis, the specific process is hemicellulose (mannan) synthesis, not cellulose synthesis.

Reason: CSLD proteins synthesize mannans/glucomannans, which are hemicellulose components, not cellulose. A more appropriate process term would be mannan biosynthetic process or cell wall organization.

Proposed replacements: cell wall organization

GO:0051753 mannan synthase activity

IEA
GO_REF:0000117

Summary: Mannan synthase activity is the most appropriate molecular function annotation for a CSLD subfamily protein. CSLD proteins use GDP-mannose as a donor substrate to synthesize beta-1,4-mannan polysaccharides, which are hemicellulose components of the plant cell wall. This ARBA-derived annotation correctly captures the enzymatic activity of CSLD proteins.

Reason: CSLD subfamily proteins have been experimentally shown to possess mannan synthase activity in multiple plant species. This is consistent with the protein being classified in the plant cellulose synthase-like D subfamily.

Core Functions

Mannan synthase activity at the Golgi or plasma membrane, catalyzing the synthesis of beta-1,4-mannan polysaccharides from GDP-mannose for incorporation into hemicellulose in the plant cell wall. Functions as part of cell wall organization during polarized growth processes.

Molecular Function:

mannan synthase activity

Directly Involved In:

cell wall organization

Cellular Locations:

Golgi membrane

Supporting Evidence:

file:ARAHY/A0A444Z7V7/A0A444Z7V7-uniprot.txt
Belongs to the glycosyltransferase 2 family. Plant cellulose synthase-like D subfamily
file:ARAHY/A0A444Z7V7/A0A444Z7V7-deep-research-falcon.md
cellulose synthase domain-containing protein belonging to the glycosyltransferase family 2 (GT2)

External Prediction Reviews

These computational predictions are reviewed separately from the GOA annotation set used for this review. The assessments below are from this project and do not constitute official GO annotations or endorsement by GO/UniProt. They are not included in the existing annotation review above.

ProtNLM External predictions

View prediction review YAML · A0A444Z7V7-protnlm-predictions-review.yaml · Review status: COMPLETE

ProtNLM2 made no predictions (GO or subcellular location) for Cellulose synthase-like protein D3. The model returned only a protein name.

Source documents: genes/ARAHY/A0A444Z7V7/A0A444Z7V7-uniprot.txt · genes/ARAHY/A0A444Z7V7/A0A444Z7V7-goa.tsv

No GO/EC predictions in the reviewed source.

Gene Description

Existing Annotations Review

Core Functions

Mannan synthase activity at the Golgi or plasma membrane, catalyzing the synthesis of beta-1,4-mannan polysaccharides from GDP-mannose for incorporation into hemicellulose in the plant cell wall. Functions as part of cell wall organization during polarized growth processes.

References

External Prediction Reviews

ProtNLM External predictions

Deep Research

Falcon

📄 View Raw YAML