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We focused on a fast-folding mutant of the ¦Ë-repressor, ¦Ë-HG, with a folding time of 15 microseconds in temperature-jump experiments. By means of a recently developed tempering method (see Zhang and Ma, J. Chem. Phys. 132:244101 (2010)), we observed reversible folding and unfolding of ¦Ë-repressor in a 10-microsecond trajectory (see movie at right). The folded state is ranked as the most populated cluster without any prior knowledge of the crystal structure in the subsequent cluster analysis. Moreover, the pathway that leads to complete folding of the protein can be followed based on this cluster analysis. Due to the enhanced sampling method used in the current study, the folding pathways observed may not be the most probable ones. Nevertheless, they represent one of the many physical pathways on the folding landscape. In addition to accelerating the search in conformational space, the enhanced sampling method also covers a broad range of temperatures in the simulation, permitting the calculation of the temperature dependence of certain structural characteristics given enough sampling (see figure below). These results highlight the potential of this enhanced sampling method and the accuracy of the underlying physical model (force field) in studying a relatively large helical protein. The simulations also revealed that the folding of ¦Ë-repressor is not a simple two-state process as proposed for most fast-folding proteins.


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·ÉÔÆ¶ù: ½ð±Ò+50, ¡ïÓаïÖú 2017-06-23 14:27:55
¿ÉÒÔÓÃWHAM·½·¨À´×öÄãÒªµÄ´øÑÕÉ«µÄͼ¡£ WHAM(Weighted histogram Analysis Method)¡£ÍøÉÏÒ²ÓÐÏֳɵÄcode£¬Äã¿ÉÒÔÕÒÕÒ¿´¡£

Kumar S, Bouzida D, Swendsen RH, Kollman PA, Rosenberg JM (1992) The weighted histogram
analysis method for free-energy calculations on biomolecules .1. the method. J Comput Chem 13:
1011-1021.
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