catabolite repression


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catabolite repression

[kə′tab·ə‚līt ri′presh·ən]
(biochemistry)
An intracellular regulatory mechanism in bacteria whereby glucose, or any other carbon source that is an intermediate in catabolism, prevents formation of inducible enzymes.
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The presence of readily metabolizable carbon sources like glucose, cellobiose, xylobiose, or xylose represses the synthesis of xylanase enzymes for the utilization of certain carbon sources such as xylan or cellulose and the process is known as catabolite repression.
As Schizochytrium is a slow growing heterotroph consuming glucose at a slow rate, wai cultivation in a non carbon catabolite repression condition or in an increased acetyl-CoA synthethase state gives rise to higher growth and glucose consumption rates (27).
This phenomenon is known as nitrogen catabolite repression (NCR).
In addition, the use of SSF for enzyme production has many advantages over submerged fermentation due to its simple technique, low capital investment, lower levels of catabolite repression and better product recovery (Considine et al.
Furthermore, pseudo-continuous fermentation in the co-culture system allows us to use a wide range of dilution rates and to prevent the diauxic kinetics caused by the xylose catabolite repression associated with S.
Below 25[degrees]C enzyme activity was less due to inappropriate incubation temperature for yeast growth, and at high temperature results in less enzyme production due to catabolite repression of enzyme (Gomez et al.
This study documents catabolite repression of prodigiosin synthesis, motility, and antibiotic susceptibility properties based upon different sugar supplemented growth conditions using S.
The influence of nitrate and nitrite reduction on catabolite repression in Escherichia coli.
The decreased activity in the later phase of growth was probably due to catabolite repression by glucose released from starch hydrolysis.