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Current Proteomics


ISSN (Print): 1570-1646
ISSN (Online): 1875-6247

B-factor Analysis and Conformational Rearrangement of Aldose Reductase

Author(s): Ganesaratnam K. Balendiran, J. Rajendran Pandian, Evin Drake, Anubhav Vinayak, Malkhey Verma and Duilio Cascio

Volume 11, Issue 3, 2014

Page: [151 - 160] Pages: 10

DOI: 10.2174/157016461103140922163444


The NADPH-dependent reduction of glucose reaction that is catalyzed by Aldose Reductase (AR) follows a sequential ordered kinetic mechanism in which the co-factor NADPH binds to the enzyme prior to the aldehyde substrate. The kinetic/structural experiments have found a conformational change involving a hinge-like movement of a surface loop (residues 213-224) which is anticipated to take place upon the binding of the diphosphate moiety of NADPH. The reorientation of this loop, expected to permit the release of NADP+, represents the rate-limiting step of the catalytic mechanism. This study reveals: 1) The Translation/Libration/Screw (TLS) analysis of absolute B-factors of apo AR crystal structures indicates that the 212-224 loop might move as a rigid group. 2) Residues that make the flexible loop slide in the AR binary and ternary complexes. 3) The normalized B-factors separate this segment into three differnt clusters with fewer residues.

Keywords: Aldo-keto reductase, B-factor, clustering, crystal structure, statistical analysis, structural dynamics, TLS.

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