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Unfolding pathways of individual bacteriorhodopsins

Oesterhelt, F. and Oesterhelt, D. and Pfeiffer, M. and Engel, A. and Gaub, H. E. and Müller, D. J.. (2000) Unfolding pathways of individual bacteriorhodopsins. Science, Vol. 288, no. 5463. pp. 143-146.

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Official URL: http://edoc.unibas.ch/dok/A5262375

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Abstract

Atomic force microscopy and single-molecule force spectroscopy were combined to image and manipulate purple membrane patches from Halobacterium salinarum. Individual bacteriorhodopsin molecules were first localized and then extracted from the membrane; the remaining vacancies were imaged again. Anchoring forces between 100 and 200 piconewtons for the different helices were found. Upon extraction, the helices were found to unfold. The force spectra revealed the individuality of the unfolding pathways. Helices G and F as well as helices E and D always unfolded pairwise, whereas helices B and C occasionally unfolded one after the other. Experiments with cleaved loops revealed the origin of the individuality: stabilization of helix B by neighboring helices.
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:American Association for the Advancement of Science
ISSN:0036-8075
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:22
Deposited On:22 Mar 2012 13:30

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