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- W2027432355 abstract "Abstract The homochirality, or isotacticity, of the natural amino acids facilitates the formation of regular secondary structures such as α‐helices and β‐sheets. However, many examples exist in nature where novel polypeptide topologies use both l ‐ and d ‐amino acids. In this study, we explore how stereochemistry of the polypeptide backbone influences basic properties such as compactness and the size of fold space by simulating both lattice and all‐atom polypeptide chains. We formulate a rectangular lattice chain model in both two and three dimensions, where monomers are chiral, having the effect of restricting local conformation. Syndiotactic chains with alternating chirality of adjacent monomers have a very large ensemble of accessible conformations characterized predominantly by extended structures. Isotactic chains on the other hand, have far fewer possible conformations and a significant fraction of these are compact. Syndiotactic chains are often unable to access maximally compact states available to their isotactic counterparts of the same length. Similar features are observed in all‐atom models of isotactic versus syndiotactic polyalanine. Our results suggest that protein isotacticity has evolved to increase the enthalpy of chain collapse by facilitating compact helical states and to reduce the entropic cost of folding by restricting the size of the unfolded ensemble of competing states." @default.
- W2027432355 created "2016-06-24" @default.
- W2027432355 creator A5000491137 @default.
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- W2027432355 date "2007-08-01" @default.
- W2027432355 modified "2023-09-30" @default.
- W2027432355 title "The role of protein homochirality in shaping the energy landscape of folding" @default.
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- W2027432355 doi "https://doi.org/10.1110/ps.072867007" @default.
- W2027432355 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2203351" @default.
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