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. 1996 May;62(5):1774–1780. doi: 10.1128/aem.62.5.1774-1780.1996

Production and processing of a 59-kilodalton exochitinase during growth of Streptomyces lividans carrying pCHIO12 in soil microcosms amended with crab or fungal chitin.

A P Vionis 1, F Niemeyer 1, A D Karagouni 1, H Schrempf 1
PMCID: PMC167953  PMID: 8633877

Abstract

Streptomyces lividans (pCHIO12), which carries the previously cloned Streptomyces olivaceoviridis exo-chiO1 gene on a multicopy vector, secretes a 59-kDa exochitinase, consisting of a catalytic domain (40 kDa), a central fibronectin type III-like module, and a chitin-binding domain (12 kDa). The propagation rate of S. lividans (pCHIO12) was higher in soil microcosms amended with fungal mycelia than in those containing crab chitin. Comparative biochemical and immunological studies allowed the following conclusions to be drawn. Within soil microcosm systems amended with crab shell chitin or chitin-containing Aspergillus proliferans mycelia, the strain expressed the clones exo-chiO1 gene and produced high quantities of a 59-kDa exochitinase. The enzyme was preferentially attached via its binding domain to the pellet from soil or liquid cultures. In contrast, truncated forms of 47, 40, and 25 kDa could be easily extracted from soil. The relative proportions of the 59-kDa enzyme and its truncated forms varied depending on the source of chitin and differed in soil and in liquid cultures.

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Selected References

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