PMID: 11315108Apr 21, 2001Paper

Purification, cloning, and DNA sequence analysis of a chitinase from an overproducing mutant of Streptomyces peucetius defective in daunorubicin biosynthesis

Canadian Journal of Microbiology
K S VetrivelKuppamuthu Dharmalingam

Abstract

Extracellular chitinases of Streptomyces peucetius and a chitinase overproducing mutant, SPVI, were purified to homogeneity by ion exchange and gel filtration chromatography. The purified enzyme has a molecular mass of 42 kDa on SDS-PAGE, and the N-terminal amino acid sequence of the protein from the wild type showed homology to catalytic domains (Domain IV) of several other Streptomyces chitinases such as S. lividans 66, S. coelicolor A3(2), S. plicatus, and S. thermoviolaceus OPC-520. Purified SPVI chitinase cross-reacted to anti-chitinase antibodies of wild-type S. peucetius chitinase. A genomic library of SPVI constructed in E. coli using lambda DASH II was probed with chiC of S. lividans 66 to screen for the chitinase gene. A 2.7 kb fragment containing the chitinase gene was subcloned from a lambda DASH II clone, and sequenced. The deduced protein had a molecular mass of 68 kDa, and showed domain organization similar to that of S. lividans 66 chiC. The N-terminal amino acid sequence of the purified S. peucetius chitinase matched with the N-terminus of the catalytic domain, indicating the proteolytic processing of 68 kDa chitinase precursor protein to 42 kDa mature chitinase containing the catalytic domain only. A putative ...Continue Reading

References

Aug 15, 1992·Experientia·J FlachP Jollès
Apr 1, 1993·Journal of General Microbiology·T Fujii, K Miyashita
Jun 5, 1998·Microbiology·Steffi KolbeHildgund Schrempf

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Citations

Nov 1, 2003·Biochemical and Biophysical Research Communications·Ranjan PrasadK Dharmalingam
Aug 27, 2013·Microbiological Research·Amrathlal Rabbind SinghKuppamuthu Dharmalingam

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