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IJC-A Vol.50A(03-04) [March-April 2011] >


Title: Density functional theory calculations on Fe2S2 clusters: Effect of ligand environment on geometric/electronic structure and reduction potential
Authors: Dey, Abhishek
Keywords: Bioinorganic chemistry
Theoretical chemistry
Density functional calculations
Iron
Sulfur clusters
Electronic structures
Reduction potentials
Issue Date: Mar-2011
Publisher: NISCAIR-CSIR, India
Abstract: The Fe2S2 clusters in nature are generally coordinated to the peptide backbone using thiolate ligands (from cysteines). A known variation of these are the imidazole (from histidine) coordinated active sites of Riesky proteins. Recently, a few newer modifications have been observed, e.g., the arginine coordinated cluster in biotin synthases. Very recently, a cysteine persulfide coordinated cluster has been observed in the hydrogenase maturase enzyme, HydE. Herein, density functional theory calculations are used to investigate the effect of the unusual arginine and cysteine persulfide coordinations on the geometric and electronic properties of these clusters. Further, the effect of these ligands in tuning the thermodynamic reduction potentials of these clusters has also been investigated.
Page(s): 498-502
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.50A(03-04) [March-April 2011]

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