Genetic reconstruction and characterization of the recombinant transacylase (E2b) component of bovine branched-chain alpha-keto acid dehydrogenase complex. Implication of histidine 391 as an active site residue.

Abstract excerpt

Genetically altered transacylase (E2b) proteins of the bovine branched-chain alpha-keto acid dehydrogenase complex were overexpressed in Escherichia coli and characterized. Deletion by PstI or Bal31 digestion of the amino-terminal region of the inner-core domain (residues 175-421) beyond residue 209 resulted in a complete loss of transacylase activity. The enzyme assay was carried out using [1-14C]isovaleryl-CoA...

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