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• W2049101434 endingPage "16717" @default.
• W2049101434 startingPage "16707" @default.
• W2049101434 abstract "Quantifying the density of conformations over phase space (the conformational distribution) is needed to model important macromolecular processes such as protein folding. In this work, we quantify the conformational distribution for a simple polypeptide (N-mer polyalanine) using the cumulative distribution function (CDF), which gives the probability that two randomly selected conformations are separated by less than a “conformational” distance and whose inverse gives conformation counts as a function of conformational radius. An important finding is that the conformation counts obtained by the CDF inverse depend critically on the assignment of a conformation's distance span and the ensemble (e.g., unfolded state model): varying ensemble and conformation definition (1 → 2 Å) varies the CDF-based conformation counts for Ala50 from 1011 to 1069. In particular, relatively short molecular dynamics (MD) relaxation of Ala50's random-walk ensemble reduces the number of conformers from 1055 to 1014 (using a 1 Å root-mean-square-deviation radius conformation definition) pointing to potential disconnections in comparing the results from simplified models of unfolded proteins with those from all-atom MD simulations. Explicit waters are found to roughen the landscape considerably. Under some common conformation definitions, the results herein provide (i) an upper limit to the number of accessible conformations that compose unfolded states of proteins, (ii) the optimal clustering radius/conformation radius for counting conformations for a given energy and solvent model, (iii) a means of comparing various studies, and (iv) an assessment of the applicability of random search in protein folding." @default.
• W2049101434 created "2016-06-24" @default.
• W2049101434 creator A5010018908 @default.
• W2049101434 creator A5084694926 @default.
• W2049101434 date "2006-07-26" @default.
• W2049101434 modified "2023-09-27" @default.
• W2049101434 title "Quantifying Polypeptide Conformational Space: Sensitivity to Conformation and Ensemble Definition" @default.
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• W2049101434 doi "https://doi.org/10.1021/jp0569133" @default.
• W2049101434 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16913810" @default.
• W2049101434 hasPublicationYear "2006" @default.
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