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• W2074970710 abstract "We have previously reported the development and evaluation of a computational program to assist in the design of hydrophobic cores of proteins. In an effort to investigate the role of core packing in protein structure, we have used this program, referred to as Repacking of Cores (ROC), to design several variants of the protein ubiquitin. Nine ubiquitin variants containing from three to eight hydrophobic core mutations were constructed, purified, and characterized in terms of their stability and their ability to adopt a uniquely folded native-like conformation. In general, designed ubiquitin variants are more stable than control variants in which the hydrophobic core was chosen randomly. However, in contrast to previous results with 434 cro, all designs are destabilized relative to the wild-type (WT) protein. This raises the possibility that beta-sheet structures have more stringent packing requirements than alpha-helical proteins. A more striking observation is that all variants, including random controls, adopt fairly well-defined conformations, regardless of their stability. This result supports conclusions from the cro studies that non-core residues contribute significantly to the conformational uniqueness of these proteins while core packing largely affects protein stability and has less impact on the nature or uniqueness of the fold. Concurrent with the above work, we used stability data on the nine ubiquitin variants to evaluate and improve the predictive ability of our core packing algorithm. Additional versions of the program were generated that differ in potential function parameters and sampling of side chain conformers. Reasonable correlations between experimental and predicted stabilities suggest the program will be useful in future studies to design variants with stabilities closer to that of the native protein. Taken together, the present study provides further clarification of the role of specific packing interactions in protein structure and stability, and demonstrates the benefit of using systematic computational methods to predict core packing arrangements for the design of proteins." @default.
• W2074970710 created "2016-06-24" @default.
• W2074970710 creator A5050290780 @default.
• W2074970710 creator A5081789226 @default.
• W2074970710 creator A5089995503 @default.
• W2074970710 date "1997-06-01" @default.
• W2074970710 modified "2023-09-23" @default.
• W2074970710 title "De novo design of the hydrophobic core of ubiquitin" @default.
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• W2074970710 doi "https://doi.org/10.1002/pro.5560060605" @default.
• W2074970710 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2143711" @default.
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