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Folding mechanism of beta-hairpin trpzip2: heterogeneity, transition state and folding pathways Xiao Y; Chen C; He YInt J Mol Sci 2009[Jun]; 10 (6): 2838-2848We review the studies on the folding mechanism of the beta-hairpin tryptophan zipper 2 (trpzip2) and present some additional computational results to refine the picture of folding heterogeneity and pathways. We show that trpzip2 can have a two-state or a multi-state folding pattern, depending on whether it folds within the native basin or through local state basins on the high-dimensional free energy surface; Trpzip2 can fold along different pathways according to the packing order of tryptophan pairs. We also point out some important problems related to the folding mechanism of trpzip2 that still need clarification, e.g., a wide distribution of the computed conformations for the transition state ensemble.|Amino Acid Sequence[MESH]|Kinetics[MESH]|Protein Folding[MESH]|Protein Structure, Secondary[MESH]|Proteins/*chemistry/metabolism[MESH] |
