Summary: This is the primary and well-established function of Ser3p. Multiple experimental studies confirm Ser3p catalyzes the oxidation of 3-phosphoglycerate to 3-phosphohydroxypyruvate with NAD+ as cofactor. This is supported by IMP evidence in PMID:12525494.

Reason: This is SER3's primary molecular function in the phosphorylated L-serine biosynthetic pathway.

Summary: Correct - Ser3p catalyzes the first step of the phosphorylated L-serine biosynthetic pathway. Loss of both SER3 and SER33 renders yeast auxotrophic for serine, confirming this role. Supported by IMP evidence in PMID:12525494.

Reason: SER3 encodes one of the yeast phosphoglycerate dehydrogenases required for de novo serine biosynthesis.

Summary: This is a correct but overly general annotation. While Ser3p does participate in amino acid biosynthesis (specifically serine), the more specific term GO:0006564 (L-serine biosynthetic process) is more informative and appropriate.

Summary: This is correct but too general. Ser3p is indeed an oxidoreductase that uses NAD+ as cofactor, but the more specific terms GO:0004617 (phosphoglycerate dehydrogenase activity) and GO:0016616 provide more informative functional descriptions.

Summary: This accurately describes the biochemical mechanism of Ser3p, which oxidizes the CH-OH group of 3-phosphoglycerate using NAD+ as electron acceptor. This is mechanistically correct and more specific than the general oxidoreductase activity term.

Summary: Correct - Ser3p requires NAD+ as a cofactor for its dehydrogenase activity. The protein contains a Rossmann fold domain for NAD+ binding, which is conserved across phosphoglycerate dehydrogenases.

Summary: Protein binding is too generic and uninformative. While Ser3p may interact with other proteins (as suggested by multiple IPI annotations), this term does not provide meaningful functional information about the gene.

Reason: Generic protein binding from a high-throughput physical-interaction assay with Ser33 does not capture a specific Ser3p molecular function.

Summary: Protein binding is too generic and uninformative. Multiple protein binding annotations from high-throughput studies do not provide meaningful functional information.

Reason: Generic protein binding from a high-throughput physical-interaction assay with Ser33 does not capture a specific Ser3p molecular function.

Summary: Protein binding is too generic and uninformative. While this may be part of protein complexes, the generic protein binding term adds no functional value.

Reason: Generic protein binding from a high-throughput physical-interaction assay with Ser33 does not capture a specific Ser3p molecular function.

Summary: Protein binding is too generic and uninformative. High-throughput interaction studies detect many non-specific interactions.

Reason: Generic protein binding from a high-throughput physical-interaction assay with Ser33 does not capture a specific Ser3p molecular function.

Summary: Protein binding is too generic and uninformative. This study focuses on paralog retention and does not provide specific functional interaction data.

Reason: Generic protein binding from the Ser3/Ser33 paralog heteromer does not capture a distinct molecular function beyond Ser3p's dehydrogenase activity.

Summary: Protein binding is too generic and uninformative. Network studies identify many interactions but do not establish functional significance.

Reason: Generic protein binding from a high-throughput physical-interaction assay with Ser33 does not capture a specific Ser3p molecular function.

Summary: A complex-level annotation propagated to a subunit. This row is assigned by ComplexPortal (SER3-goa.tsv:14), which curates the SESAME metabolic enzyme complex CPX-9181; UniProt records Ser3p's membership of that complex at SER3-uniprot.txt:99. The property being annotated belongs to SESAME as a whole, and reaches Ser3p only by virtue of subunit membership, not because Ser3p's own 3-phosphoglycerate dehydrogenase activity was shown to participate in an oxidative-stress response.

Reason: Not wrong, but over-general in the same way as the two sibling annotations from this reference. GO:0040029 (epigenetic regulation of gene expression) and GO:1902494 (catalytic complex) carry the identical provenance - same reference, same NAS evidence code, same ComplexPortal assignment on CPX-9181 - and both are marked MARK_AS_OVER_ANNOTATED for exactly this reason, so the same call applies here. Note that a lack of full-text access is not the operative limitation - full text would not convert a complex-level propagation into a subunit-level claim. The earlier REMOVE was wrong in the other direction, since the underlying complex-level biology is genuine rather than fabricated; what the annotation overstates is Ser3p's individual contribution to it.

Summary: This appears to be based on the SESAME complex study linking serine metabolism to histone modifications. However, this is an indirect connection through metabolite availability rather than a direct function of SER3. The primary function of SER3 is serine biosynthesis.

Reason: SER3 is physically part of the SESAME complex that influences histone modifications and gene expression, but this process term overstates SER3 as a direct epigenetic regulator rather than a metabolic enzyme in the complex.

Summary: This cellular component term is too generic. Ser3p is reported as part of the SESAME catalytic complex, but the annotation does not provide a specific, informative localization or complex name.

Reason: The SESAME evidence supports complex membership, so the annotation is not wrong; it is over-general and less useful than identifying the specific SER3 serine-biosynthetic role and SESAME context.

Summary: Correct localization. Ser3p is a cytosolic enzyme involved in central metabolism. This is supported by high-throughput localization studies and consistent with its role in metabolizing cytosolic glycolytic intermediates.

Summary: Protein binding is too generic and uninformative. This study is about Serinc proteins, not directly about SER3 function.

Reason: The abstract describes mammalian Serinc proteins, not S. cerevisiae Ser3p, and the generic protein binding term has no independent functional value.

Summary: This annotation captures a real secondary activity of Ser3p, but the stereochemical term is wrong. The evidence shows Ser3/Ser33 interconvert α-ketoglutarate and D/R-2-hydroxyglutarate, not S-2-hydroxyglutarate.

Reason: The current precise GO term for the demonstrated reaction is (R)-2-hydroxyglutarate (NAD+) dehydrogenase activity.

Proposed replacements: (R)-2-hydroxyglutarate (NAD+) dehydrogenase activity

Summary: This provides mutant-phenotype support for the same D/R-2-hydroxyglutarate activity, but the existing annotation uses the S-stereoisomer term.

Reason: The phenotype evidence supports the R/D-2-hydroxyglutarate reaction and should be moved to GO:0120568 rather than accepted as an S-2-hydroxyglutarate annotation.

Proposed replacements: (R)-2-hydroxyglutarate (NAD+) dehydrogenase activity

Summary: This provides genetic interaction evidence for the D/R-2-hydroxyglutarate activity. The original term assignment has the wrong stereochemistry.

Reason: The evidence complements the direct biochemical evidence for D/R-2-hydroxyglutarate chemistry, so the replacement should be GO:0120568.

Proposed replacements: (R)-2-hydroxyglutarate (NAD+) dehydrogenase activity

Summary: This is strong experimental support for the primary function of Ser3p. This key study demonstrated that Ser3p and Ser33p are the yeast phosphoglycerate dehydrogenases through mutant phenotype analysis.

Reason: Mutant analysis directly supports phosphoglycerate dehydrogenase activity as SER3's core biochemical function.

Summary: Excellent experimental evidence for SER3 role in serine biosynthesis. This study showed that deletion of both SER3 and SER33 renders yeast auxotrophic for serine, confirming their essential role in serine production.

Reason: The serine auxotrophy and loss of detectable phosphoglycerate dehydrogenase activity in ser3/ser33 mutants directly support SER3 participation in L-serine biosynthesis.