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click here 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 out targeted discussions of proteins, whereas giving the entire crucial historical past chemistry, together with series choice, synthesis and spectroscopic equipment. The method is meant to motivate the reader to move classical barriers whereas gaining an figuring out of protein habit on a molecular point. The ebook comprises chapters at the organic roles of amino acids, in addition to a piece on enzyme-catalyzed synthesis of peptides, with appropriate examples, a space frequently ignored in texts describing peptide synthesis. this contemporary textual content should be of worth within the amino acid, peptide and protein box, to complex undergraduates, graduate scholars and examine staff.
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For example, incorporation of the four-membered-ring ␣-imino acid azetidine-2-carboxylic acid instead of the ﬁve-membered-ring proline and incorporation of norleucine (side-chain CH2CH2CH2CH3) instead of methionine (side-chain CH2CH2SCH3) have been demonstrated (Richmond, 1972) and ␤-(3-thienyl)-alanine has been assimilated into protein synthesis by E. , 1995). , 1989). Ways have been found, in the laboratory, of broadening the speciﬁcity of some enzymes (particularly the proteinases, but also certain lipases that can be used in laboratory peptide synthesis; see Chapter 7), for example by employing organic solvents, so that these enzymes catalyse some of the reactions of non-protein amino acid derivatives and some of the reactions of peptides that incorporate unusual amino acids.
N- and Cderivatised dipeptides are insoluble in water, but derivatised peptides longer than three or four amino-acid residues are usually appreciably soluble in water, owing to their greater number of backbone amide groups. 6 Longer oligopeptides: primary, secondary and tertiary structure As the chain length increases further, other factors come into play to determine the overall conformation of the peptide and the electrically charged groups at the ends of the chain are less important in this respect.
Representative peptides made up from -␣-amino acids. (a) The structural formula of a parallel ␤-sheet showing H-bonds. (b) The structural formula of a righthanded ␣-helix showing H-bonds. (c) The standard ‘tape’ depictions of the right-handed ␣-helix and antiparallel ␤-sheet. All amide bonds are in the trans conﬁguration. numerous physical phenomena (gel formation as gelatin solutions are cooled, which is mimicked by the behaviour of some synthetic oligopeptide solutions) and more subtle aspects of protein behaviour of physiological importance.