An electrophoretically homogeneous elastase preparation free from tryptic and chymotryptic activities was obtained by chromatography on DEAE-Sephadex and CM-cellulose. This preparation exhibits a narrower specificity towards peptide bonds than that observed by Naughton & Sanger (1961). With oxidized insulin B chain as substrate, the fastest breaks occur between alanine-14 and leucine-15 and between valine-18 and cysteic acid-19. The bond between glycine-23 and phenylalanine-24 is also efficiently hydrolysed. Other bonds hydrolysed are that between valine-12 and glutamic acid-13 and that between serine-9 and histidine-10. Oxidized insulin A chain is hydrolysed only at one of two points, between alanine-8 and serine-9 or between serine-12 and leucine-13, and the rate of hydrolysis is very low.
Research Article| August 01 1969
The specificity of purified porcine pancreatic elastase
A. Sampath Narayanan;
Biochem J (1969) 114 (1): 11–17.
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A. Sampath Narayanan, R. A. Anwar; The specificity of purified porcine pancreatic elastase. Biochem J 1 August 1969; 114 (1): 11–17. doi: https://doi.org/10.1042/bj1140011
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