Crystal structure of the S-nitroso form of liganded human hemoglobin.Chan, N.L., Rogers, P.H., Arnone, A.
(1998) Biochemistry 37: 16459-16464
- PubMed: 9843411
- DOI: https://doi.org/10.1021/bi9816711
- Primary Citation of Related Structures:
- PubMed Abstract:
Although numerous reports have documented that the S-nitrosylation of cysteine residues by NO alters the activities of a wide variety of proteins, the direct visualization and the structural consequences of this reversible modification have not yet been reported for any protein. Here we describe the crystal structure of S-nitroso-nitrosylhemoglobin determined at a resolution of 1.8 A. The specific reaction of NO with Cys93beta is confirmed in this structure, and a large S-nitrosylation-induced change in the tertiary structure of the COOH-terminal dipeptides of the beta subunits provides additional insight into the stereochemical mechanism by which blood flow is regulated by the interaction of NO with hemoglobin.
Department of Biochemistry, College of Medicine, The University of Iowa, Iowa City 52242, USA.