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A Study of the Catabolite Repression of the Dehalogenase Iva Gene of Burkholderia Cepacia Mba4

A Study of the Catabolite Repression of the Dehalogenase Iva Gene of Burkholderia Cepacia Mba4


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About the Book

This dissertation, "A Study of the Catabolite Repression of the Dehalogenase IVa Gene of Burkholderia Cepacia MBA4" by Hiu-fung, Yuen, 阮曉峰, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the thesis entitled A STUDY OF THE CATABOLITE REPRESSION OF THE DEHALOGENASE IVa GENE OF Burkholderia cepacia MBA4 Submitted by Yuen Hiu Fung for the degree of Master of Philosophy at The University of Hong Kong in August 2004 Deh4a is encoded in a haloacids operon and expression of Deh4a is induced by 2-haloacids such as monochoroacetate (MCA). Carbon Catabolite repression control (CRC) has been reported in the degradation of many carbon sources but has not been previously investigated in the degradation of 2-haloacids. In this study, the haloacids operon was demonstrated to be under CRC. Transcription of the haloacids operon was repressed by nutrient-rich medium and succinate to 0.79% and 15% of the MCA induced level, respectively. Western analysis confirmed a reduced protein level under these conditions. Tn5 transposon mutagenesis was used to isolate mutants with relieved CRC. One transconjugant, 131M04, was found to possess 3-fold relieved repression of the haloacids operon in rich medium. The DNA sequence of the corresponding wild-type gene was determined to encode a putative branched-chain amino acid (BCA) transporter (BAT). Cloning and expression of this ORF in an E. coli strain defective in BCA transport rescued the capability of the cells to transport isoleucine. When MBA4 was cultivated in minimal medium with MCA and BCA, expression of the haloacids operon is repressed to 46% of the level when BCA was absent. This repression effect was relieved in strain 131M04. These results indicate that expression of the haloacids operon is repressed by the presence of BCA and mutation of the BAT partially relieved the CRC conferred by rich medium and BCA. DOI: 10.5353/th_b3068211 Subjects: Pseudomonas - Genetics Operons Haloacid dehalogenase Genetic regulation


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Product Details
  • ISBN-13: 9781374727236
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 134
  • Weight: 327 gr
  • ISBN-10: 1374727237
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Spine Width: 7 mm
  • Width: 216 mm


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