Source assertion

PDBe/SIFTS maps PDB 4KNN to UniProt Q8N1Q1 with chain-level identity and coverage retained.

Evidence ID: STRUCTURE:PDB:4KNN:UNIPROT:Q8N1Q1
Subject dossier: ca13
Source chain: uniprot + pdbe
Upstream record: 4KNN
Corpus snapshot: 2026-07-14T09:23:31Z
Admission status: Admitted release record

Experimental structure

Crystal structure of human carbonic anhydrase isozyme XIII with 2-Chloro-4-[(pyrimidin-2-ylsulfanyl)acetyl]benzenesulfonamide

PDB ID: 4KNN
Experimental method: X-ray diffraction
Resolution: %!f(*float64=0xc000068a60) Å
SIFTS identifier: CAH13_HUMAN
Deposited: 20130510
Released / revised: 20131106 / 20231108

Chain-level mapping

Entity	Chain	Structural asym	Identity	Coverage	UniProt range
1	`A`	`B`	100.0%	100.0%	1–262
1	`B`	`A`	100.0%	100.0%	1–262

Experimental constructs

Entity	Chains / asym IDs	Molecule	Length	Mutation flag	Preparation
1	A, B / A, B	Carbonic anhydrase 13polypeptide(L)	263 residues	not reported in admitted source fields	Genetically manipulated

Interpretation boundary

This record represents an experimentally determined structure, not a predicted model. A co-crystal ligand, if present upstream, does not by itself establish affinity. This record does not infer kinetics, pathway rate, or metabolic flux.

Snapshot provenance

Each retained corpus build input is identified by retrieval time, snapshot path, SHA-256 digest, and exact upstream request. The snapshot files are not embedded in the served binary; the provenance identifiers remain dependencies of this one admitted record, not interchangeable citations.

Retrieved	Snapshot	SHA-256	Upstream request
2026-07-14T09:21:33Z	`raw/uniprot/entries/Q8N1Q1.json`	`606f7712a41abd05d3b9d0522bbefd377f44b400f37aba7cab2c788361ea41dd`	Open exact source
2026-07-14T09:22:09Z	`raw/pdbe/mappings/4knn.json`	`e4ce8b7c318416d39bb495098a6413beee4a2a1aeeec61821f4495b9d7f777a1`	Open exact source
2026-07-14T09:22:16Z	`raw/pdbe/summary/chunk-03.json`	`d318ed911ff2a8e3f25986a39c37baa2a3bb13c1d2a75d036924ca34ffa2b9cb`	Open exact source
2026-07-14T09:22:16Z	`raw/pdbe/experiment/chunk-03.json`	`8bbfae15de944b1cacdf21ee7a42caf9f09149a49b6fdf48f69df854b06973c9`	Open exact source
2026-07-14T09:22:17Z	`raw/pdbe/molecules/chunk-03.json`	`e94951408bdc68a6d0767211c754ae03dc74c4cf253ad3a7626c02d4aaba5eeb`	Open exact source