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Closed Access item Modification of the amino and hydroxyl groups of lysozyme with carboxylic acid anhydrides: a comparative study

Authors:Bernad, Antonio
Nieto, M. Ángela
Vioque, Agustín
Palacián, Enrique
Keywords:Lysozyme, Chemical modification, Carboxylic acid anhydride, Lysine residue, Serine residue, Threonine residue, Hydroxyl group regeneration
Issue Date:17-Oct-1986
Citation:Biochimica et Biophysica Acta 873(3): 350-355 (1986)
Abstract:Modification of hydroxyl groups by carboxylic acid anhydrides is an unwanted reaction when these reagents are used to modify protein amino groups. It is important to know the specificity of different anhydrides, and the stability of the modified hydroxyl groups. Lysozyme was treated with acetic, succinic, maleic, monomethylmaleic and dimethylmaleic anhydrides, and the extent of modification of the amino and hydroxyl groups was evaluated. Amino groups were found to be much more reactive than the hydroxyl groups. Of the reagents used, dimethylmaleic anhydride is the most specific for amino groups, with practically no modification of hydroxyamino acid residues. The modified hydroxyl groups are preferentially deacylated at alkaline pH. For acetic, succinic and maleic anhydrides, the half-lives of the modified serine (25–45 min) and threonine (14–30 h) residues were determined at pH 10.0 and 37°C. Under these conditions, the modified hydroxyl groups can be selectively deacylated without practically affecting the modified amino groups.
Description:6 páginas, 4 figuras, 1 tabla.
Publisher version (URL):http://dx.doi.org/10.1016/0167-4838(86)90083-X
Appears in Collections:(CBM) Artículos

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