Atomic-Resolution Structure of an N(5) Flavin Adduct in D-Arginine Dehydrogenase
- GSU
D-Arginine dehydrogenase (DADH) catalyzes the flavin-dependent oxidative deamination of D-arginine and other D-amino acids to the corresponding imino acids. The 1.07 {angstrom} atomic-resolution structure of DADH crystallized with D-leucine unexpectedly revealed a covalent N(5) flavin adduct, instead of the expected iminoleucine product in the active site. This acyl adduct has been successfully reproduced by photoreduction of DADH in the presence of 4-methyl-2-oxopentanoic acid (ketoleucine). The iminoleucine may be released readily because of weak interactions in the binding site, in contrast to iminoarginine, converted to ketoleucine, which reacts with activated FAD to form the covalently linked acyl adduct.
- Research Organization:
- Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
- Sponsoring Organization:
- DOE - BASIC ENERGY SCIENCES
- OSTI ID:
- 1020592
- Journal Information:
- Biochemistry-US, Journal Name: Biochemistry-US Journal Issue: (29) ; 07, 2011 Vol. 50; ISSN 0006-2960; ISSN BICHAW
- Country of Publication:
- United States
- Language:
- ENGLISH
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