Notes for DANRE pcif1

• Core function is CAPAM m6Am writer activity on capped mRNAs PMID:30467178.
• The translation annotation is retained as non-core because the effect is downstream of m6Am installation and UniProt notes that transcript-level effects remain debated.

Re-review 2026-09-29

Re-reviewed all 10 annotation rows (11 GOA lines; the two ISS nucleus lines from 2019 and 2024 share one row) against the cached discovery paper (PMID:30467178, abstract-only) and the refreshed UniProt record, and rewrote every review block, the description, references and core function.

• The decisive zebrafish-specific evidence is in the UniProt reference block rather than the abstract: the discovery paper solved the crystal structure of the zebrafish protein and assayed it directly [file:DANRE/pcif1/pcif1-uniprot.txt "X-RAY CRYSTALLOGRAPHY (1.8 ANGSTROMS) OF 178-673 IN COMPLEX WITH S-ADENOSYL-L-METHIONINE AND M7G-CAPPED RNA, FUNCTION, CATALYTIC ACTIVITY, AND MUTAGENESIS OF ARG-239; ARG-269; ASN-558; PHE-561; GLU-563; TRP-593; 596-PRO-PRO-597; HIS-612 AND PHE-619"]. This grounds the three IDA rows (GO:0016422, GO:1904047, GO:0006397) on the zebrafish enzyme itself, not by transfer.
• GO:0016422 (IDA and IEA): ACCEPT as the core activity PMID:30467178.
• GO:0006397 mRNA processing (IDA): ACCEPT; the participation test is met because Pcif1 catalyses the cap-modification step. GO:0016556 mRNA modification is not a descendant of mRNA processing (QuickGO ancestors of GO:0016556 do not include GO:0006397), so it is raised as a question rather than a MODIFY.
• GO:1904047 SAM binding (IDA): KEEP_AS_NON_CORE, now supported by the SAM-bound zebrafish crystal structures (PDB 6IRX/6IRY/6IRZ/6IS0) instead of a bare UniProt token.
• GO:0045727 positive regulation of translation (ISS from human): changed KEEP_AS_NON_CORE -> MARK_AS_OVER_ANNOTATED. The direction of the m6Am effect is contested in the source organism: human PCIF1 (Q9H4Z3) carries GO:0045727 (IMP), GO:0017148 negative regulation of translation (IDA) and NOT GO:0006417 (IDA) in current QuickGO, and UniProt records the conflict [file:DANRE/pcif1/pcif1-uniprot.txt "The role of N(6),2'-O-dimethyladenosine cap (m6A(m)) on transcripts is unclear and subject to discussion"]. The finding in PMID:30467178 is marked DISPUTED in the references list.
• GO:0099122 Pol II CTD binding (IEA and ISS): KEEP_AS_NON_CORE, both rows consistently; the WW domain (FT DOMAIN 43..77) is conserved and the interaction is stated in the abstract PMID:30467178, but the crystallized zebrafish construct (178-673) lacks the WW domain, so it is inferred for the zebrafish protein.
• Nucleus (IBA/IEA/ISS): ACCEPT; the PAINT node PTN001094508 is seeded by human PCIF1 (nucleus by EXP/IDA) and the nuclear substrate and Pol II association apply to the zebrafish protein [file:DANRE/pcif1/pcif1-uniprot.txt "SUBCELLULAR LOCATION: Nucleus {ECO:0000250|UniProtKB:Q9H4Z3}"].
• Removed the deep-research paraphrases of UniProt from supported_by; kept the one zebrafish-specific falcon finding (m6Am detectable in zebrafish mRNA). Added reference_review to PMID:30467178 (VERIFIED, HIGH), two suggested questions and one suggested experiment. Validation: zero errors, zero warnings.