Oct 20, 1991

Refined crystal structure of Cd, Zn metallothionein at 2.0 A resolution

Journal of Molecular Biology
A H RobbinsC D Stout

Abstract

The crystal structure of Cd5,Zn2-metallothionein from rat liver has been refined at 2.0 A resolution of a R-value of 0.176 for all observed data. The five Cd positions in the asymmetric unit of the crystal create a pseudo-centrosymmetric constellation about a crystallographic 2-fold axis. Consequently, the distribution of anomalous differences is almost ideally centrosymmetric. Therefore, the previously reported metal positions and the protein model derived therefrom are incorrect. Direct methods were applied to the protein amplitudes to locate the Cd positions. The new positions were used to calculate a new electron density map based on the Cd anomalous scattering and partial structure to model the metal clusters and the protein. Phases calculated from this model predict the positions of three sites in a (NH4)2WS4 derivative. Single isomorphous replacement phases calculated with these tungsten sites confirm the positions of the Cd sites from the new direct methods calculations. The refined metallothionein structure has a root-mean-square deviation of 0.016 A from ideality of bonds and normal stereochemistry of phi, phi and chi torsion angles. The metallothionein crystal structure is in agreement with the structures for the alp...Continue Reading

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Mentioned in this Paper

Tungsten
Sulfur
X-Ray Diffraction
Zinc
Protein Conformation
Hydrogen Bonding
Cadmium
Cd-Zn-metallothionein
Polymorphism, Crystallization
Metallothionein IIA

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