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Comparison of the structures of the metal-thiolate binding site in Zn(II)-, Cd(II)-, and Hg(II)-metallothioneins using molecular modeling techniques.

Abstract：

:The first fully energy-minimized structures for a series of structurally related metal complexes of the important mammalian metal binding protein metallothionein are described. The structures were calculated based on structural information obtained from existing spectroscopic and crystallographic data, and minimized using molecular mechanics (MM2) techniques. A two domain structure, with stoichiometries of M(II)3-(Scys)9 and M(II)4-(Scys)11 where M = zinc(II), cadmium(II), and mercury(II), was assembled and minimized. The resultant three-dimensional structure closely resembled that of rat liver Cd5Zn2-MT 1 obtained by analysis of x-ray diffraction data [A. H. Robbins, D.E. McRee, M. Williamson, S. A. Collett, N. H. Xuong, W. F. Furey, B. C. Wang and C. D. Stout, J. Mol. Biol. 221, 1269-1293 (1991)]. Minimized structures for Zn7-MT, Cd7-MT, and Hg7-MT are reported. Deep crevices that expose the metal-thiolate clusters are seen in each structure. However, for the mercury-containing protein, much of the mercury-thiolate structure is visible and it is proposed that this provides access for extensive interaction between solvent water molecules and the mercury(II), resulting in the observed distortion away from tetrahedral geometry for Hg7-MT. Volume calculations are reported for the protein metallated with 7 Zn(II), Cd(II), or Hg(II). A series of structural changes calculated for the step-wise isomorphous replacement of Zn(II) by Cd(II) and Hg(II) in the Zn4S11 alpha domain are shown.

journal_name

J Biomol Struct Dyn

journal_title

Journal of biomolecular structure & dynamics

authors

Fowle DA,Stillman MJ

doi

10.1080/07391102.1997.10508139

subject

Has Abstract

pub_date

1997-02-01 00:00:00

pages

393-406

issue

4

eissn

0739-1102

issn

1538-0254

journal_volume

14

pub_type

杂志文章

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