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• W2143886556 endingPage "4022" @default.
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• W2143886556 abstract "To enable application of postgenomic evolutionary approaches to understand the divergence of behavior and function in ribonucleases (RNases), the impact of divergent sequence on the divergence of tertiary and quaternary structure is analyzed in bovine pancreatic and seminal ribonucleases, which differ by 23 amino acids. In a crystal, seminal RNase is a homodimer joined by two antiparallel intersubunit disulfide bonds between Cys-31 from one subunit and Cys-32' from the other and having composite active sites arising from the swap of residues 1-20 from each subunit. Specialized Edman degradation techniques have completed the structural characterization of the dimer in solution, new cross-linking methods have been developed to assess the swap, and sequence determinants of quaternary structure have been explored by protein engineering using the reconstructed evolutionary history of the protein family as a guide. A single Cys at either position 32 (the first to be introduced during the divergent evolution of the family) or 31 converts monomeric RNase A into a dimer. Even with an additional Phe at position 31, another residue introduced early in the seminal lineage, swap is minimal. A hydrophobic contact formed by Leu-28, however, also introduced early in the seminal lineage, increases the amount of antiparallel connectivity of the two subunits and facilitates swapping of residues 1-20. Efficient swapping requires addition of a Pro at position 19, a residue also introduced early in the divergent evolution of the seminal RNase gene. Additional cysteines required for dimer formation are found to slow refolding of the protein through formation of incorrect disulfide bonds, suggesting a paradox in the biosynthesis of the protein. Further studies showed that the dimeric form of seminal RNase known in the crystal is not the only form in vivo, where a substantial amount of heterodimer is known. These data complete the acquisition of the background needed to understand the evolution of new structure, behavior, and function in the seminal RNase family of proteins." @default.
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• W2143886556 date "1998-03-01" @default.
• W2143886556 modified "2023-09-25" @default.
• W2143886556 title "Origin of Dimeric Structure in the Ribonuclease Superfamily" @default.
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• W2143886556 doi "https://doi.org/10.1021/bi972203e" @default.
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• W2143886556 hasPublicationYear "1998" @default.
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