The mechanism of sugar-mediated catabolite repression of the propionate catabolic genes in Escherichia coli |
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Authors: | Park Jung Min Vinuselvi Parisutham Lee Sung Kuk |
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Affiliation: | School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea. |
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Abstract: | Carbon catabolite repression (CCR) is a well-known phenomenon that involves the preferential utilization of glucose as a carbon source. Cyclic adenosine monophosphate (cAMP) and the cAMP receptor protein (CRP) mediate CCR. Recently, a second CCR hierarchy that leads to the preferential consumption of arabinose over xylose, mediated by arabinose-bound AraC, has been identified. In this study, we report yet another CCR hierarchy that causes the preferential utilization of sugars (arabinose, galactose, glucose, mannose, and xylose) over a short-chain fatty acid (propionate). Expression of the propionate catabolic (prpBCDE) genes is down-regulated in the presence of these sugars. Sugar-mediated repression of the propionate catabolic genes is independent of sugar-specific regulators such as AraC and dependent on global regulators of sugar transport such as the cAMP-CRP complex and the Phosphotransferase System (PTS). Inhibition of the prpBCDE promoter is encountered during rapid sugar uptake and metabolism. This unique regulatory crosstalk between sugar metabolism and fatty acid metabolism may help provide new insights into CRP-dependent catabolite repression acting in conjunction with non-carbohydrate metabolism. |
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Keywords: | ara operon, arabinose operon cAMP, cyclic adenosine monophosphate CCR, carbon catabolite repression CP, constitutive promoter CRP, cAMP receptor protein cya, adenylate cyclase DNS, 3,5-dinitrosalicylic acid GFP, green fluorescent protein IPTG, isopropyl β-D-thiogalactopyranoside OD600, optical density at 600 nm PCR, polymerase chain reaction prp operon, propionate operon PTS, phosphotransferase system RFU, relative fluorescence unit SOE-PCR, splice overlap extension-PCR |
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