CA5A (HGNC:1377; UniProt P35218, secondary B2RPF2; previous symbol CA5) encodes a 305-residue precursor. Human liver cDNA expression, mitochondrial fractions and N-terminal sequencing support a 38-residue targeting peptide and the mature chain at residues 39–305. The mature chain is a processing product, not an alternatively spliced isoform. The normal seed contains 20 annotations, 16 references and no alternative-product records; all original source fields are preserved.
The review centers on one activity: reversible carbon dioxide/bicarbonate interconversion in the mitochondrial matrix. Zinc coordination is part of that catalytic apparatus. It is retained as a non-core binding annotation, not made into a second core function. The source seed has no biological-process annotation. This review adds none: supplying bicarbonate is mechanistically distinct from catalyzing the reactions of CPS1, pyruvate carboxylase, propionyl-CoA carboxylase or methylcrotonyl-CoA carboxylase. The clinical metabolite profile supports that physiological connection without assigning CA5A those enzymes' activities.
GO:0005737 cytoplasm includes organelles and must not be equated with cytosol. Its inherited CA5A annotation is broad rather than contradicted by mitochondrial import. The five broad location rows are refined to the existing GO:0005759 mitochondrial matrix, which is part of mitochondrion. This combines the source annotation with independent target-specific literature and reaction context; it does not pretend that every original assay itself resolved the matrix.
GO:0004089 carbonate dehydratase activity describes the reversible bicarbonate/carbon-dioxide reaction and has hydro-lyase activity as its parent. The official term pages were checked through accessible indexed AmiGO records. Direct page requests that timed out are recorded as failures, not as successful reads.
The PTHR18952 membership export identifies the carbonic-anhydrase family but contains no PAINT tree/IBD record. PTN001055728 and PTN002708220 are preserved with explicit ancestral-node access limits. Their donor lists are not scored by length, and human P35218 appearing as a source is not called circular. Direct human activity and localization evidence support the reviewed biology.
The 20 decisions are 14 ACCEPT, five MODIFY and one KEEP_AS_NON_CORE. No source row, qualifier, original reference, partner, NOT flag or product is removed or invented. Short source anchors across nine publications support the catalytic and localization evidence; repeated snippets remain below 25 aggregate words per publication. Reference assessments distinguish bibliographic identity from whether the exact original target assay was independently inspected.
One normal Falcon deep-research attempt with the configured perplexity-lite fallback was made with the installed client version 0.2.7rc1. Both providers failed with DNS errors and produced no provider report. These manual reading notes are the fallback; no provider-branded research file was written. Credential-bearing diagnostic traces were not displayed or saved; the explicit filtered outcome records the failure.
The normal source run was 37141556947. ROOT imported eight previously absent files and preserved eight existing caches. Both PANTHER outputs remained outside the import scope. Scientific authorship is by /root/bloc_followup; /root/bicra_science read the exact description and single core and found no synthesis correction, without claiming an independent whole-gene review. The separate whole-review peer remains pending. This entry does not claim external maintainer approval.
Normal candidate validation passed with zero review warnings. COMPLETE describes the completed, warning-free assessment; it does not erase the explicit limitations on individual original assays or claim that every publication was read in full.
The exact YAML and notes approved by the distinct internal ROOT whole-science peer were applied after preimage checks. Normal canonical validation and status checks passed without warnings, retaining COMPLETE; targeted HTML rendering and a standard codex/gpt-6 CREATE history validation passed. All 20 machine source objects and 16 original references remain intact, with 14 ACCEPT, five MODIFY and one KEEP_AS_NON_CORE, one catalytic core and no NEW assertions. Source caches and family exports remain unchanged. Remote publication remains a separate ROOT-owned step.
The first external review of PR #3928 requested retention of the four correct GO:0005739 mitochondrion assertions at their original resolution. Their HTP, IBA, IDA and IEA decisions are now ACCEPT, without replacement terms. The distinct NAS and TAS assertions already record mitochondrial matrix localization, which remains the location of the unchanged catalytic core. The broader cytoplasm assertion retains its MODIFY recommendation. This decision does not imply that PAINT or ortholog inference can never support a submitochondrial compartment; the exact ancestral node remains uninspected.
The resulting tally is 18 ACCEPT, one MODIFY and one KEEP_AS_NON_CORE. All 20 machine source objects, original qualifiers and supporting entities, 16 references, ten quoted fields and the single core are unchanged. No NEW assertion or source retrieval is introduced. Earlier journal entries retain the original assessment tally as historical provenance.
The focused candidate passed distinct internal science review and was applied exactly. Normal canonical validation and status checks passed without review warnings, retaining COMPLETE. Targeted HTML rendering and validation of the newly scaffolded EDIT history also passed. The prior CREATE history and every source cache remain unchanged. This entry records local application, not publication or merge.