mvaB

Summary: Generic catalytic activity is redundant with the exact lyase term.

Reason: Replace the generic catalytic term with the substrate-specific HMG-CoA lyase activity.

Proposed replacements: hydroxymethylglutaryl-CoA lyase activity

Summary: Correct enzyme-specific molecular function.

Reason: The UniProt catalytic reaction explicitly cleaves HMG-CoA to acetoacetate and acetyl-CoA.

Summary: Plausible terminal role in distal L-leucine catabolism.

Reason: The HMG-CoA lyase reaction consumes the product of LiuC.

Summary: Oxo-acid lyase activity is a broad parent term.

Reason: This is a valid parent activity, while the substrate-specific HMG-CoA lyase activity captures the core function.

Summary: HMG-CoA lyases are DRE-TIM metallolyases with a conserved divalent-cation site.

Reason: A divalent cation is a mechanistic requirement of the family, although the preferred ion has not been measured for Q88H25.

Summary: The reaction produces acetoacetate, but that product alone does not establish a dedicated ketone-body biosynthetic process.

Reason: The GO:0046951 definition describes formation of the ketone bodies acetoacetate, D-3-hydroxybutyrate or acetone, a coordinated ketogenic programme whose physiological output is an exported fuel. MvaB's chemistry produces acetoacetate, so the term is not false at the reaction level, but the pathway context recorded for Q88H25 is degradative rather than ketogenic: UniProt assigns it to metabolic intermediate metabolism, (S)-3-hydroxy-3-methylglutaryl-CoA degradation, acetoacetate from (S)-3-hydroxy-3-methylglutaryl-CoA, step 1/1 (UniPathway UPA00896/UER00863), and the characterized close ortholog LiuE acts in the leucine/isovalerate catabolic route. P. putida KT2440 has no described ketone-body physiology, and the acetoacetate released here is a catabolic intermediate. The annotation is therefore retained as an over-annotation: a whole-pathway process term attributed to a single enzyme on the strength of its product, with the supported process term GO:0006552 L-leucine catabolic process already carried.