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Expression and Cloning of the pmmC Gene Encoding Phosphomannomutase in Sphingomonas chungbukensis DJ77  

Kim Mi-Hye (School of Life Sciences, Chungbuk National University)
Choi Jung-Do (School of Life Sciences, Chungbuk National University)
Shin Malshick (Department of Food and Nutrition, Chonnam National University)
Kim Young-Chang (School of Life Sciences, Chungbuk National University, Biotechnology Research Institute, Chungbuk National University)
Publication Information
Microbiology and Biotechnology Letters / v.33, no.2, 2005 , pp. 84-89 More about this Journal
Abstract
Phosphomannomutase (PMM) is a key enzyme in prokaryotes and eukaryotes, which catalyzes the conversion of ${\alpha}$-D-mannose 6-phosphate to ${\alpha}$-D-mannose 1-phosphate. The latter is the substrate for the synthesis of GDP-mannose, which serves as the mannosyl donor for many metabolic pathways in the cells. We report here on the isolation of a gene from a genomic library of Sphingomonas chungbukensis DJ77, the pmmC gene encoding phosphomannomutase. The gene was cloned into E. coli expression vector, and the sequence was analyzed. The ribosomal binding site GGAAG lays 5 bp upstream of the ORF of 750 bp, which is initiated by ATG codon and terminated by TAG. The predicted sequence of the enzyme consists of 249 amino acids with a molecular mass of 27.4 kDa and showed $86.9\%$ similarity to that of eukaryotic phosphomannomutase after bioinformatical analyses with the conserved domain search of NCBI. The purified gene product revealed the activity of phosphomannomutase. In conclusion, we confirmed that pmmC gene encodes phosphomannomutase actually.
Keywords
Sphingomonas chungbukensis; pmmC; phosphomannomutase;
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