Molecular dynamics simulation of truncated bovine adrenodoxin |
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Authors: | Shakya Saurabh Kumar Gu Wei Helms Volkhard |
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Affiliation: | Center for Bioinformatics, Saarland University, D-66041 Saarbrücken, Germany. |
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Abstract: | The 128 amino acid long soluble protein adrenodoxin (Adx) is a typical member of the ferredoxin protein family that are electron carrier proteins with an iron-sulfur cofactor. Adx carries electrons from adrenodoxin reductase (AdR) to cytochrome P450s. Its binding modes to these proteins were previously characterized by site-directed mutagenesis, by X-ray crystallography for the complex Adx:AdR, and by NMR. However, no clear evidence has been provided for the driving force that promotes Adx detachment from AdR upon reduction. Here, we characterized the conformational dynamics of unbound Adx in the oxidized and reduced forms using 2-20 ns long molecular dynamics simulations. The most noticeable difference between both forms is the enhanced flexibility of the loop (47-51) surrounding the iron-sulfur cluster in the reduced form. Together with several structural displacements at the binding interface, this increased flexibility may be the key factor promoting unbinding of reduced Adx from AdR. This points to an intrinsic property of reduced Adx that drives dissociation. |
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Keywords: | adrenodoxin electron carrier proteins iron–sulfur cofactor molecular dynamics dissociation protein‐protein interaction |
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