INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
artículos
Título:
Molecular basis of the NO trans influence in quaternary T-state human hemoglobin: A computational study
Autor/es:
PETRUK, A.A.; VERGARA, A.; ESTRIN, D.A.; MERLINO, A.
Revista:
FEBS LETTERS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 587 p. 2393 - 2398
ISSN:
0014-5793
Resumen:
NO binding to the T-state of human hemoglobin (HbA) induces the cleavage
of the proximal His bonds to the heme iron in the α-chains, whereas it
leaves the β-hemes hexacoordinated. The structure of the nitrosylated
T-state of the W37Eβ mutant (W37E) shows that the Fe-His87α bond remains
intact. Exactly how mutation affects NO binding and why tension is
apparent only in HbA α-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 α-chain.