Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

SwissProt keyword-derived (SPKW) annotations present in the Sept 2025 goa_uniprot_gcrp snapshot but removed from the current GOA release after GOA retired the keyword2GO pipeline for cellular organisms.
For OsLSD1, the keywords "Plant defense", "Hypersensitive response" and "Differentiation" mapped to direction-neutral / direction-conflating process terms; the direction-aware versions (negative regulation of defense response / of the HR; positive regulation of cell differentiation) better reflect the biology.

Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt

Nuclear localization (GO:0005634) assigned from the UniProt subcellular-location "Nucleus", which is itself based on the experimental OsLSD1-GFP imaging in PMID:15915636.

PMID:15915636

OsLSD1, a rice zinc finger protein, regulates programmed cell death and callus differentiation.

OsLSD1 is a rice functional homolog of Arabidopsis LSD1; LSD1 and LOL1 contain three conserved zinc-finger domains and have antagonistic effects on plant PCD.
Antisense (knockdown) OsLSD1 rice plants show a lesion-mimic phenotype, increased PR-1 mRNA and an accelerated hypersensitive response to avirulent blast - the de-repressed cell-death phenotype of a negative regulator of PCD/HR.
35S overexpression of OsLSD1 accelerated callus differentiation in transformed rice tissues and increased chlorophyll b; OsLSD1 plays a positive role in callus differentiation.
Both sense and antisense plants conferred enhanced resistance to a virulent blast isolate; ectopic overexpression in tobacco conferred tolerance to the PCD-eliciting toxin fumonisin B1.
The OsLSD1-GFP fusion localizes to the nucleus; OsLSD1 expression is light-induced and dark-suppressed.

file:ORYSJ/LSD1/LSD1-deep-research-falcon.md

Deep-research report (falcon / Edison Scientific Literature) - functional annotation of rice LSD1 (Q0J7V9).

Synthesizes the rice-specific Wang et al. 2005 primary study with the Arabidopsis LSD1/LOL1 threshold-model literature (Epple et al. 2003) and later rice metacaspase / blast-interaction studies, concluding OsLSD1 is a plant-specific small C2C2 zinc-finger protein acting largely as a negative regulator of PCD and a positive regulator of callus differentiation, localized to the nucleus.
Notes OsLSD1 (LOC_Os08g06280 / Os08g0159500) is a ~143-184 aa protein with three internally conserved C2C2-type zinc-finger motifs, 58% identity to Arabidopsis LSD1 and 85% to LOL1; it is unrelated to the mammalian LSD1/KDM1A demethylase (name collision only).
Reports that yeast two-hybrid assays place OsLSD1 in metacaspase-linked PCD signaling (interacts with type I metacaspases OsMC1/OsMC2/OsMC3), and that a 2024 rice GWAS nominates OsLSD1 as a callus-induction-rate candidate gene, reinforcing the differentiation role (not functionally validated).