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By C.B. Anfinsen, John T. Edsall, Frederic M. Richards, David S. Eisenberg and George Lorimer (Eds.)

Experiences present themes within the box of protein chemistry. the topics coated contain the constitution and mechanism of heat-shock-related proteins, the function of prolylisomerases in protein folding, and the mechanism of enzymic and nonenzymic prolylcis-transisomerization.

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Such a reaction is not found in the folding of the third parvalbumin variant that lacks proline. 2. T h e U, 2 Us reactions in unfolded proteins have properties that are characteristic of prolyl peptide bond isomerizations in small peptides. The equilibrium is independent of temperature (Schmid, 1982) and independent of the concentration of additives, such as guanidinium chloride (GdmCI) (Schmid and Baldwin, 1979),that strongly decrease protein stability but do not affect prolyl peptide bond isomerization.

Its folding kinetics are dominated by the slow trans + cis isomerizations of two prolyl residues that are in the cis conformation in the native protein. Folding and unfolding reactions can be studied in the presence and in the absence of the two disulfide bonds. Furthermore, an interesting interrelationship between the two slow events, prolyl isomerization and formation of disulfide bonds, is observed in the oxidative folding of reduced RNase T1. A. , 1989). The structure is shown schematically in Fig.

Prolyl Peptide Bonds . . . . . . . . . . . . . . . . C. Prolyl Isomerization in Protein Folding . . 111. Prolyl Isomerases A. B. C. D. Discovery of P Three-Dimensional Structure of Cyclophilin Cyclophilin Family . . . . . . . . . . . . . . . . . . . . . . Catalysis of Slow-Folding Steps IV. V. VI. B. Dependence on Substrate Concentration of Folding Catalysis C . Efficiency of Catalysis . . D. Native State Isomerization ...... 25 26 26 27 28 30 31 31 33 33 34 36 36 37 40 42 42 44 44 46 48 51 VII.

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