Reference : Molecular dynamics simulation of truncated bovine adrenodoxin
Scientific journals : Other
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/10993/3775
Molecular dynamics simulation of truncated bovine adrenodoxin
English
Shakya, S. K. [> >]
Gu, Wei mailto []
Helms, V. [> >]
2005
Biopolymers
Wiley Interscience
78
1
9-20
Yes (verified by ORBilu)
International
0006-3525
1097-0282
New York
NY
[en] 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. (c) 2005 Wiley Periodicals, Inc.
http://hdl.handle.net/10993/3775
10.1002/bip.20242

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