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L-Isoleucine methyl ester is a protected form of L-Isoleucine. L-Isoleucine is classified as an essential amino acid, and is also a tumour promoter of bladder cancer in rats.
1.Chemical modification of amino groups and guanidino groups of trypsin. Preparation of stable and soluble derivatives.
Nureddin A, Inagami T. Biochem J. 1975 Apr;147(1):71-81.
1. Isoionic chemical modification of amino groups of trypsin (EC 3.4.21.4) was studied for the purpose of obtaining a well-defined modified trypsin with minimum changes in physicochemical properties and with sufficient stability at neutral pH. Acetamidination with methyl acetimidate hydrochloride proceeded very rapidly at pH9.8 and 5degrees C and all 14 epsilon-amino groups were modified in 2h. The reaction was limited to epsilon-amino groups. The alpha-amino group of N-terminal isoleucine was modified only by repeated reactions in the presence of 5.5 M-guanidine or 8 M-urea. 2. The epsilon-acetamidinated derivative of beta-trypsin retained enzymic activity at values comparable with those of native enzyme tested with alpha-N-benzoyl-L-arginine ethyl ester and alpha-N-benzoyl-L-arginine p-nitroanilide as substrates; it also showed substrate activation comparable with that of native enzyme. The acetamidination of alpha-trypsin resulted in approx.
