serine protease from the bovine duodenal mucosa, chymotrypsin-like duodenase
Chymotrypsin‐like duodenase (ChlD), a new protease from the bovine duodenum mucosa was isolated and purified. The enzyme molecule is a single chain (25 kDa); the native enzyme is a monomer with an isoelectric point > 10.0. ChlD displays the chymotrypsin‐like activity and cleaves 4‐nitroanilide su...
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Published in | European journal of biochemistry Vol. 255; no. 2; pp. 501 - 507 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Berlin & Heidelberg
Springer‐Verlag
15.07.1998
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Subjects | |
Online Access | Get full text |
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Summary: | Chymotrypsin‐like duodenase (ChlD), a new protease from the bovine duodenum mucosa was isolated and purified. The enzyme molecule is a single chain (25 kDa); the native enzyme is a monomer with an isoelectric point > 10.0. ChlD displays the chymotrypsin‐like activity and cleaves 4‐nitroanilide substrates of chymotrypsin, chymases and cathepsin G. ChlD hydrolyzes its best substrate 2‐N‐succinylvalylprolylphenylalanine 4‐nitroanilide with kcat of 2.8 s−1 and catalytic efficiency kcat/Km of 2300 M−1 s−1. The enzyme is stable with a pH range of 3−10 and exhibits the maximum activity at pH 8−10. ChlD is irreversibly inhibited by diisopropylphosphofluoridate and phenylmethanesulfonyl fluoride, which is indicative of an active‐site serine in this protease. α‐N‐tosyl‐
L‐phenylalanine chloromethane, a specific reagent for a catalytically active His, markedly inhibited ChlD. The enzyme activity was strongly inhibited by several natural inhibitors of serine proteases (from soybean, potato, Lima bean, kidney bean). The N‐terminal sequence of the native ChlD (23 amino acids) shows high similarity, but not identity, to those of duodenase, granzymes, chymases and cathepsin G. |
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Bibliography: | 95 310 70 07. chymotrypsin A ChlD, chymotrypsin‐like duodenase; Ac, α enteropeptidase benzyloxycarbonyl; Suc, α T. S. Zamolodchikova, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, RAS, 16/10 Miklukho‐Maklaya, 117871 Moscow V‐437, Russia F, phenylmethanesulfonyl fluoride; STI, soybean trypsin inhibitor; BBI, soybean Bowman‐Birk inhibitor; LBTI, Lima bean trypsin inhibitor; BPTI, bovine pancreatic trypsin inhibitor; KBI, kidney bean trypsin and chymotrypsin inhibitor; ATI, trypsin inhibitor from tree‐thorned acacia; PI‐I, potato chymotrypsin inhibitor I; PI‐II, potato chymotrypsin inhibitor II; COVO, chicken egg white ovomucoid; DOVO, duck egg white ovomucoid. benzoyl; Cbz, α acetyl; Bz, α phenylalanine chloromethane; iPr L N succinyl; Tos, α chymase I (RMCP I) P elastase EC3.4.21.36 Enzymes. Abbreviations. EC3.4.17.1 tatyana@enzyme.siobc.ras.ru E‐mail F, diisopropylphosphofluoridate; PhMeSO [4‐toluenesulfonyl]; ‐NH‐Np, 4‐nitroanilide; TosPheCH EC3.4.21.39 . chymase II (RMCP II), (EC 3.4.21.–); cathepsin G 2 Trypsin EC3.4.21.4 Cl, α EC3.4.21.20 carboxypeptidase A EC3.4.21.9 Correspondence to Fax tosyl EC3.4.21.1 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0014-2956 1432-1033 |
DOI: | 10.1046/j.1432-1327.1998.2550501.x |