cheY (PP_4340, Q88EW2) notes

2026-11-03 re-review

• Deep research: just deep-research PSEPK cheY --provider perplexity failed (provider 'perplexity' not available); just mod-description-deep-research skipped (no MOD provider configured for PSEPK). Existing falcon report used; every falcon quote was checked as a verbatim substring.
• UniProt quotes now cite the local flat file (file:PSEPK/cheY/cheY-uniprot.txt). ARBA-only, imported (ECO:0000313), DE-name and DR GO lines are not used as support.
• Earlier version had paraphrased supporting_text attributed to abstract-only PMIDs 36287825 and 25100612, and a non-verbatim falcon quote; all replaced.
• Evidence: P. putida CheA transfers phosphate to CheY in vitro PMID:40197389; CheY co-purifies with CheA PMID:40197389. PROSITE REC domain 2-119 and 4-aspartylphosphate Asp52 (PROSITE-ProRule).
• Added NEW GO:0000156 phosphorelay response regulator activity (IC, PMID:40197389; locus tag of the assayed CheY not stated in the text, so not IDA) and NEW GO:0006935 chemotaxis (IC; cluster with cheA2, whose mutant is non-chemotactic PMID:30761113). No KT2440 cheY mutant exists (knowledge gap; see suggested experiments).
• GO:0000160 ACCEPT; GO:0005737 ACCEPT (no cytosol row; UniProt location is ARBA-only so support is falcon synthesis plus the He 2025 description). Status COMPLETE.