Isotope effects for deuterium transfer and mutagenesis of Tyr187 provide insight into controlled radical chemistry in adenosylcobalamin-dependent ornithine 4,5-aminomutase.

Abstract

Adenosylcobalamin-dependent ornithine 4,5-aminomutase (OAM) from Clostridium sticklandii utilizes pyridoxal 5'-phosphate (PLP) to interconvert d-ornithine to 2,4-diaminopentanoate via a multistep mechanism that involves two hydrogen transfer steps. Herein, we uncover features of the OAM catalytic mechanism that differentiate it from its homologue, the more… (More)
DOI: 10.1021/bi5006706

Topics

10 Figures and Tables