Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Bacillus sp. KJ16에서 Cyclodextrin Gluanotransferase와 Cyclodextrinase 생산의 Catabolite Repression

  • Published : 1996.04.01
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Abstract

The biosynthesis and catabolite repression of cyclodextrin glucanotransferase(CGTase) and cyclodextrinase(CDase) were studied in Bacillus sp. KJI6. In accompanying to the cell growth, CGTase was synthesized during early growth phase (20h culture) and CDase was synthesized during late growth phase (60h culture). Synthesis of CGTase was rather constitutive than that of CDase in the absence or presence of carbon source. Production of CDase was strongly stimulated by amylopectin and $\gamma$-CD medium (about 6 times), but CGTase synthesis was slightly increased (about 1.3 times). Easily metabolizable carbohydrates such as D-glucose, D- fructose and D-mannose completely repressed the expression of CDase, whereas their repressive effect to CGTase synthesis was relatively negligible. By addition of 10 mM cAMP, any significant effect on the synthesis of the two enzymes was not observed. Hardly metabolizable glucose analogues such as 2-deoxy-D-glucose and 3-0-methyl-D-glucopyranose also did not show any repression on the syntheses of CGTase and CDase. This indicates that D-glucose has to be metabolized to exert its repressive effect. With these results, it seems likely that the biosynthesis of CGTase and CDase are regulated by the catabolite repression due to unknown metabolite(s) of EM pathway.

Keywords

References

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