Inhibition of various proteases by MAPI and inactivation of MAPI by trypsin

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Title
Inhibition of various proteases by MAPI and inactivation of MAPI by trypsin
Author(s)
Hyun Sook Lee; Yung Hee Kho; Kye Joon Lee
Bibliographic Citation
Journal of Microbiology and Biotechnology, vol. 10, no. 2, pp. 181-186
Publication Year
2000
Abstract
MAPI (microbial alkaline protease inhibitor) was isolated from culture broth of Streptomyces chromofuscus SMF28. The K(i) values of MAPI for the representative serine proteases such as chymotrypsin and proteinase K were 0.28 and 0.63 μM, respectively, and for the cysteine proteases cathepsin B and papain were 0.66 and 0.28 μM, respectively. These data indicate that MAPI is not a potent selective inhibitor of serine or cysteine proteases. Progress curves for the inhibition of three proteases by MAPI exhibited characteristic patterns: MAPI exhibited slow-binding inhibition of cathepsin B. It was rapidly associated with chymotrypsin before the addition of substrate and then reactivation of MAPI-inhibited enzyme was investigated in the presence of substrate. On the other hand, MAPI-proteinase K interaction was typical for those classical inhibitors. When MAPI was incubated with trypsin, there was an extensive reduction in the inhibitory activities of MAPI corresponding to 66.5% inactivation of MAPI, indicating that trypsin- like protease may play a role in the decrease of the inhibitory activity during cultivation.
Keyword
MAPIStreptomyces chromofuscusinactivating enzymetrypsin-like proteaseslow-binding inhibition
ISSN
1017-7825
Publisher
Korea Soc-Assoc-Inst
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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