Molecular basis of the NO trans influence in quaternary T-state human hemoglobin: A computational study(590 views) Alcides Petruk A, Vergara A, Estrin D, Merlino A
Keywords: Molecular Dynamics, Nitric Oxide, Nitrosylhemoglobin, Hemoglobin Alpha Chain, Hemoglobin Beta Chain, Article, Controlled Study, Density Functional Theory, Hydration, Ligand Binding, Nitrosylation, Priority Journal, Protein Conformation, Protein Tertiary Structure, Humans, Molecular Dynamics Simulation, Protein Structure, Quaternary,
Affiliations: *** IBB - CNR ***
Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE-CONICET, University of Buenos Aires, Buenos Aires, Argentina
Department of Chemical Sciences, University of Naples Federico II, via Cintia, 80126 Napoli, Italy
Institute of Biostructures and Bioimages, CNR, via Mezzocannone 16, 80100 Napoli, Italy
Departamento de Qu mica Inorg nica, Anal tica y Qu mica F sica, INQUIMAE-CONICET, University of Buenos Aires, Buenos Aires, Argentina
References: Not available.
Molecular basis of the NO trans influence in quaternary T-state human hemoglobin: A computational study
NO binding to the T-state of human hemoglobin (HbA) induces the cleavage of the proximal His bonds to the heme iron in the alpha-chains, whereas it leaves the beta-hemes hexacoordinated. The structure of the nitrosylated T-state of the W37E beta mutant (W37E) shows that the Fe-His87 alpha bond remains intact. Exactly how mutation affects NO binding and why tension is apparent only in HbA alpha-heme remains to be elucidated. By means of density functional theory electronic structure calculations and classical molecular dynamics simulations we provide an explanation for the poorly understood NO binding properties of HbA and its W37E mutant. The data suggest an interplay between electronic effects, tertiary structure and hydration site modifications in determining the tension in the NO-ligated T-state HbA alpha-chain. (C) 2013 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
Molecular basis of the NO trans influence in quaternary T-state human hemoglobin: A computational study
Santulli G, Cipolletta E, Sorriento D, Del Giudice C, Anastasio A, Monaco S, Maione AS, Condorelli G, Puca A, Trimarco B, Illario M, Iaccarino G * CaMK4 gene deletion induces hypertension(430 views) J Am Heart Assoc Journal Of The American Heart Association (ISSN: 2047-9980), 2012; 1(4): N/D-N/D. Impact Factor:2.882 ViewExport to BibTeXExport to EndNote