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. 1992 Jun;174(11):3450–3454. doi: 10.1128/jb.174.11.3450-3454.1992

Chitinases of Streptomyces olivaceoviridis and significance of processing for multiplicity.

A Romaguera 1, U Menge 1, R Breves 1, H Diekmann 1
PMCID: PMC206026  PMID: 1592803

Abstract

Five extracellular chitinases of 20.5, 30, 47, 70, and 92 kDa purified from the culture filtrate of Streptomyces olivaceoviridis ATCC 11238 differed in their sequences at the amino termini of the protein chains. In the native state, the chitinases were found to be resistant to proteolysis by trypsin, papain, and Staphylococcus aureus V8 protease. The latter produced several fragments of identical molecular mass from chitinases denaturated with sodium dodecyl sulfate. Five proteases were detected in the protein concentrate from the culture filtrate, and two of them showing ability to cleave chitinases in the native state were purified. One, a protease of 42 kDa, released a 30-kDa protein from the 70-kDa chitinase that reacts with anti-30 kDa chitinase antibodies; the other, a protease of 29 kDa, split the 30-kDa chitinase into 20.5-, 18-, and 16-kDa fragments. From these results, it was deduced that the 70-kDa chitinase is the precursor protein of the 30- and 20.5-kDa chitinases.

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Selected References

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