Abstract
The production of cyclodextrin glucanotransferase (CGTase) by Bacillus ohbensis is dependent on the presence of starch and inhibited by glucose in the medium. Northern blot analysis revealed that the CGTase gene (cgt) was transcribed to almost the same level irrespective of the presence or absence of starch, but glucose completely repressed the transcription. Furthermore, a relatively high amount of CGTase protein was detected on Western blotting only in the medium with starch, showing the lack of posttranslational control of the CGTase activity. These findings suggest some starch induction mechanism for the cgt gene, possibly at the posttranscriptional level, besides negative transcriptional regulation by glucose.
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