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Excision of a Protein-Derived Amine for p -Aminobenzoate Assembly by the Self-Sacrificial Heterobimetallic Protein CADD.
Biochemistry 2023 November 8
Chlamydia protein associating with death domains (CADD), the founding member of a recently discovered class of nonheme dimetal enzymes termed hemeoxygenase-like dimetaloxidases (HDOs), plays an indispensable role in pathogen survival. CADD orchestrates the biosynthesis of p -aminobenzoic acid ( p ABA) for integration into folate via the self-sacrificial excision of a protein-derived tyrosine (Tyr27) and several additional processing steps, the nature and timing of which have yet to be fully clarified. Nuclear magnetic resonance (NMR) and proteomics approaches reveal the source and probable timing of amine installation by a neighboring lysine (Lys152). Turnover studies using limiting O2 have identified a para -aminobenzaldehyde (pABCHO) metabolic intermediate that is formed on the path to p ABA formation. The use of p ABCHO and other probe substrates shows that the heterobimetallic Fe/Mn form of the enzyme is capable of oxygen insertion to generate the pABA-carboxylate.
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