By G. C. Barrett
This article is meant for undergraduate and starting graduate scholars in chemistry and biochemistry learning amino acids and peptides. The authors be aware of amino acids and peptides with no unique discussions of proteins, whereas giving the entire crucial historical past chemistry, together with series decision, synthesis and spectroscopic equipment. The technique is meant to inspire the reader to move classical limitations whereas gaining an realizing of protein habit on a molecular point. The booklet contains chapters at the organic roles of amino acids, in addition to a piece on enzyme-catalyzed synthesis of peptides, with compatible examples, a space usually missed in texts describing peptide synthesis. this contemporary textual content should be of price within the amino acid, peptide and protein box, to complex undergraduates, graduate scholars and learn staff.
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Extra info for Amino Acids and Peptides (1998)
E. 5 Å) and is the Debye–Hückel parameter deﬁned by the equation ϭ 4Ne2 ͚c z 2 i i i DRT 1/2 where ci and Zi are the concentration and charge of the ith ionic species. At best, this correction is only approximate since it assumes that the peptide or protein is spher33 ical with the charges uniformly distributed over the surface. In addition, the eﬀective dielectric constant in the vicinity of the molecule is likely to be much lower than D, the bulk dielectric constant of the solvent.
1. (a) Amide bonds in the trans and cis conﬁgurations. (b) Torsion angles for an amino-acid residue in a peptide. 2. A representative dipeptide made up from -␣-amino acids, in the extended conformation with the amide bond in the trans conﬁguration. amino acids, assist the adoption of more ﬂexible structures by peptides when they are built into peptides, because mixtures of cis and trans conﬁgurations are more likely. Cis-amide bonds are rare in natural polypeptides that contain no proline residues (there are three cis-amide bonds in the enzyme carboxypeptidase A and one in the smaller polypeptide concanavalin A), though current re-investigations by NMR methods (Chapter 3) are revealing more distorted trans-amide bonds in structures established without such details in the early days of X-ray crystallography.
D. (1985) J. , 8, 15. Fasman, G. D. (1989) Prediction of Protein Structures and the Principles of Protein Conformation, Plenum, New York. Fasman, G. D. ) (1996) Circular Dichroism in Conformational Analysis of Biomolecules, Plenum, New York. Hermkens, P. H. , van Dinther, T. , Joukema, C. , Wagenaars, G. N. and Ottenheijm, H. C. , 35, 9271. , Buttkus, U. -H. (1991) Angew. Chem. Int. , 30, 1514. Zimm, B. , and Bragg, J. K. (1959) J. Chem. , 31, 526. g. g. g. aliphatic hydroxy and side-chain amide groups).
Amino Acids and Peptides (1998) by G. C. Barrett