| Claim/annotation | Evidence type | Key details/quantitative data | Source with year and DOI/URL if available | Notes/limitations about gene identity specificity |
|---|---|---|---|---|
| **sou1 is a bona fide S. pombe gene/transcript name in the literature** | Indirect mention in primary experiment | In a study of TFIIH-associated kinase function in *S. pombe*, **sou1** transcript levels were analyzed alongside **ace2, eng1, mid2**; the authors report that **eng1, mid2, and sou1 transcripts decreased** in the mutant background, indicating that *sou1* is an annotated *S. pombe* transcript/gene name. No enzyme function was provided. (pqac-00000006, pqac-00000007, pqac-00000008) | Lee et al., 2005, *Molecular Biology of the Cell*; DOI: 10.1091/mbc.e04-11-0982; URL: https://doi.org/10.1091/mbc.e04-11-0982 | This supports **gene-name existence in *S. pombe***, but does **not** explicitly link the transcript to **SPAC8E11.10** or **UniProt Q9Y6Z9** within the paper text. |
| **Osmotic/sorbitol stress in S. pombe induces genes predicted to participate in sorbitol utilization, including oxidoreductases** | Primary experiment, but **not sou1-specific** | Microarray analysis under sorbitol stress identified **13 sorbitol-specific genes** and **8 CESR genes super-induced by sorbitol**. Among the sorbitol-specific genes, **SPAC22A12.17c** and **SPACUNK4.17** were described as **putative sugar oxidoreductases that may be involved in sorbitol utilization**; **SPAC25B8.12c** encoded a **hydrolase short-chain dehydrogenase**. (pqac-00000002, pqac-00000003, pqac-00000004) | Chen et al., 2003, *Molecular Biology of the Cell*; DOI: 10.1091/mbc.e02-08-0499; URL: https://doi.org/10.1091/mbc.e02-08-0499 | Important contextual support for a **sorbitol-related metabolic program** in *S. pombe*, but the paper does **not explicitly name sou1/SPAC8E11.10/Q9Y6Z9**. Therefore this is **indirect** evidence only. |
| **The specific annotation of S. pombe Sou1 as “sorbose reductase / sorbitol utilization protein” is not directly demonstrated in the retrieved primary S. pombe papers** | Inference from absence of explicit evidence | Across the retrieved *S. pombe* papers, no direct enzymatic assay, no substrate panel, no kinetic constants, and no localization data were found for **sou1/SPAC8E11.10/Q9Y6Z9**. (pqac-00000002, pqac-00000003, pqac-00000004, pqac-00000006, pqac-00000007, pqac-00000008) | Synthesized from retrieved *S. pombe* contexts | This is the key limitation: current context supports **very limited organism-specific functional annotation**. The UniProt/PomBase-style assignment cannot be fully validated from the gathered primary literature alone. |
| **A homologously named SOU1 in Candida albicans encodes an NADPH-dependent L-sorbose reductase** | Primary experiment in a **different organism** | The *C. albicans* SOU1 gene was described as encoding **NADPH-dependent L-sorbose reductase** and its transcription increased in sorbose-utilizing mutants; BMH1 was reported to repress **SOU1** transcription. (pqac-00000005, pqac-00000001) | Wang et al., 2004, *Yeast*; DOI: 10.1002/yea.1079; URL: https://doi.org/10.1002/yea.1079 | **Do not treat as direct evidence for S. pombe sou1.** Useful only as comparative context showing that the symbol **SOU1/sou1 is ambiguous across fungi** and commonly associated with sorbose reduction. |
| **Comparative genomics literature outside S. pombe links SOU1 to EC 1.1.1.289 and L-sorbose to D-sorbitol conversion** | Indirect mention / comparative genomics | A yeast comparative genomics paper notes that **SOU1 (K17742; EC 1.1.1.289)** is an enzyme that **converts L-sorbose into D-sorbitol**. (pqac-00000000) | Lopes et al., 2016, *FEMS Yeast Research*; DOI: 10.1093/femsyr/fow044; URL: https://doi.org/10.1093/femsyr/fow044 | Again, this is **not S. pombe-specific experimental evidence** for SPAC8E11.10/Q9Y6Z9; it is consistent with the UniProt annotation but remains **indirect**. |
| **No subcellular localization evidence for S. pombe Sou1 was identified in current context** | Inference from absence of evidence | No microscopy, fractionation, localization tag, or compartment-specific functional data were found for *S. pombe* **sou1** in the retrieved contexts. (pqac-00000002, pqac-00000003, pqac-00000004, pqac-00000006, pqac-00000007, pqac-00000008) | Synthesized from retrieved *S. pombe* contexts | Localization therefore remains unresolved from the current evidence set; any cytosolic assignment would be a **family-based inference**, not directly demonstrated here. |
| **No quantitative enzyme kinetics or substrate-specificity data for S. pombe Sou1 were identified in current context** | Inference from absence of evidence | No **Km**, **Vmax**, cofactor preference measurements, or direct substrate-conversion assays were retrieved for *S. pombe* **sou1/SPAC8E11.10/Q9Y6Z9**. (pqac-00000002, pqac-00000003, pqac-00000004, pqac-00000006, pqac-00000007, pqac-00000008) | Synthesized from retrieved *S. pombe* contexts | This is a major evidence gap relative to the requested functional annotation. The strongest reaction assignment in current context comes only from **non-*pombe*** SOU1 literature and comparative annotation. |


*Table: This table summarizes the currently supported evidence for Schizosaccharomyces pombe sou1 from the retrieved context, separating direct organism-specific findings from indirect comparative inferences. It highlights that most strong functional claims for Sou1 remain indirect rather than experimentally demonstrated in S. pombe.*