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Detecting molecular interactions that stabilize native bovine rhodopsin

Tanuj Sapra, K. and Park, P. S. and Filipek, S. and Engel, A. and Muller, D. J. and Palczewski, K.. (2006) Detecting molecular interactions that stabilize native bovine rhodopsin. Journal of molecular biology, Vol. 358, H. 1. pp. 255-269.

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Official URL: http://edoc.unibas.ch/dok/A5262431

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Abstract

Using single-molecule force spectroscopy we probed molecular interactions within native bovine rhodopsin and discovered structural segments of well-defined mechanical stability. Highly conserved residues among G protein-coupled receptors were located at the interior of individual structural segments, suggesting a dual role for these segments in rhodopsin. Firstly, structural segments stabilize secondary structure elements of the native protein, and secondly, they position and hold the highly conserved residues at functionally important environments. Two main classes of force curves were observed. One class corresponded to the unfolding of rhodopsin with the highly conserved Cys110-Cys187 disulfide bond remaining intact and the other class corresponded to the unfolding of the entire rhodopsin polypeptide chain. In the absence of the Cys110-Cys187 bond, the nature of certain molecular interactions within folded rhodopsin was altered. These changes highlight the structural importance of this disulfide bond and may form the basis of dysfunctions associated with its absence.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Engel)
UniBasel Contributors:Engel, Andreas H
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Elsevier
ISSN:0022-2836
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:21
Deposited On:22 Mar 2012 13:24

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