By Douglas C. Neckers, William S. Jenks, Thomas Wolff
Content material: Photochemistry of triarylmethane dye leuconitriles / Viktor V. Jarikov and Douglas C. Neckers -- constitution and reactivity of natural intermediates as published by way of time-resolved infrared spectroscopy / John P. Toscano -- Semiconductor photocatalysis for natural synthesis / Horst Kisch -- Photophysical probes of DNA sequence-directed constitution and dynamics / Catherine J. Murphy
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P. Printz and P. H. von Hippel, Biochemi,stO" 7, 3194 (19681. :::~ C. V, Hanson, Anal. Biochem. 32,303 (1969L :;' C. Tanford, "Physical Chemistry of Macromolecules,'" p. 225. Wiley, New York, 1961. :"' C. W. Lees and P. H. von Hippel, Biochemistry 7, 3194 (1968). 34 CONFORMATION AND TRANSITIONS  T h e Slow Hydrogens of Proteins Information on the details of protein folding, on structure change, and on structural dynamics is contained in the behavior of the slowly exchanging hydrogens of proteins.
There is one significant exception in proteins--the primary amide side chains of asparagine and glutamine which can appear in exchange curves under certain conditions. ~:~ Possible low-level exceptions involve, in proteins, the C2-H of the histidine imidazole chain ~; and. ':' Among the other hydrogens that are present, carbon-bound H exchange extremely slowly,"; so that they do not get labeled and do not contribute to the measurement. , within the firs! '""' :' A. Hvidt and S. O. Nielsen, Adv.
W. Englander and A. polymers 7. 379(19691. 35 " Exchange rates for the fieely exposed protons of the peptide groups indicated are predicted for pH 5 and 0 °. The poly-D,L-alanine (PDLA) rate constant, computed fiom Eq. (1) for this condition, is taken as a base rate: to this is added, for each peptide group, correction factors due to inductive effects of the nearest-neighbor side chains, as tabulated by R. S. Molday. S. W. Englander, and R. G. Kallen, Biochemistiy 11, 150 (1972). When amino acid sequences are not known, this general expectation of a 2- to 3-fold speeding over the rate indicated by Eq.