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KMID : 0545120010110010153
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Journal of Microbiology and Biotechnology
2001 Volume.11 No. 1 p.153 ~ p.159
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Membrane Transporter Genes in Cephabacin Biosynthetic Gene Cluster of Lysobacter lactamgenus
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Nam, Doo Hyun
Lim, Si Kyu/Chung, Min Ho/Lee, Eung Seok/Sohn, Young Sun/Dewey D.Y.Ryu
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Abstract
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In order to clone the peptide synthetase gene from Lysobacter lactamgenus IFO 14,288, the gene fragments were amplified using primers for the adenylation domain and the thionylation domain of the peptide synthetase genes in other organisms by polymerase chain reaction (PCR). The resulting 0.5-kb fragment was cloned in a pGEM-T vector, and the nucleotide sequences were determined. Six different PCR products were obtained; three were identified to be a part of L-α-aminoadipyl-L-cysteinyl-D-valine (ACV) synthetase and three to be other peptide synthetases. Using each of the two different classes of PCR products as mixed probes, a cosmid library of L lactamgenus chromosomal DNA constructed in a pHC79 vector was screened by an in situ hybridization procedure, and one positive clone was selected which was bound by peptide synthetase gene fragments as well as ACV synthetase gene fragments. The partial sequence analysis from the obtained pPTS-5 cosmid showed the presence of more than two open reading frames. These were for two putative membrane transporters, which were homologous with several integral membrane proteins including the ABC transporter ATP-binding protein of E. coli (YbjZ) and the metal ion uptake protein of Bacillus subtilis (YvrN). A 45% homology was also found between the two transporter proteins at the carboxy terminus. Through a hydropathy analysis and transmembrane analysis, 4-5 transmembrane domains were found in these two proteins. When the genes were expressed in Escherichia coli, the gene products inhibited the host cell growth, probably due to the disturbance of the membrane transport system.
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KEYWORD
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