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- W837523969 abstract "Experimental and computational folding studies of Proteins L & G and NuG2 typically find that sequence differences determine which of the two hairpins is formed in the transition state ensemble (TSE). However, our recent work on Protein L finds that its TSE contains both hairpins, compelling a reassessment of the influence of sequence on the folding behavior of the other two homologs. We characterize the TSEs for Protein G and NuG2b, a triple mutant of NuG2, using ψ analysis, a method for identifying contacts in the TSE. All three homologs are found to share a common and near-native TSE topology with interactions between all four strands. However, the helical content varies in the TSE, being largely absent in Proteins G & L but partially present in NuG2b. The variability likely arises from competing propensities for the formation of nonnative β turns in the naturally occurring proteins, as observed in our TerItFix folding algorithm. All-atom folding simulations of NuG2b recapitulate the observed TSEs with four strands for 5 of 27 transition paths [Lindorff-Larsen K, Piana S, Dror RO, Shaw DE (2011) Science 334(6055):517-520]. Our data support the view that homologous proteins have similar folding mechanisms, even when nonnative interactions are present in the transition state. These findings emphasize the ongoing challenge of accurately characterizing and predicting TSEs, even for relatively simple proteins." @default.
- W837523969 created "2016-06-24" @default.
- W837523969 creator A5013006329 @default.
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- W837523969 date "2015-06-22" @default.
- W837523969 modified "2023-10-18" @default.
- W837523969 title "Even with nonnative interactions, the updated folding transition states of the homologs Proteins G & L are extensive and similar" @default.
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- W837523969 doi "https://doi.org/10.1073/pnas.1503613112" @default.
- W837523969 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4500205" @default.
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- W837523969 hasPublicationYear "2015" @default.
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