Phosphopentomutase of Bacillus stearothermophilus TH6-2: the enzyme and its gene ppm.
Phosphopentomutase catalyzes the transfer of an intramolecular phosphate on ribose or deoxyribose, and is involved in the salvage pathway of nucleoside synthesis. We identified a sequence 5'-upstream of the genes for the nucleoside phosphorylases of Bacillus stearothermophilus as the phosphopentomutase (ppm) gene. The novel gene corresponded to an open reading frame of 1,179 nucleotides that is translated into a putative 393-amino acid protein with a molecular weight of 43,735. The gene product, partially purified from ppm-overexpressing Escherichia coli cells, was judged to be a monomer of a 44-kDa polypeptide. The phosphopentomutase was found to catalyze the phosphotransfer on not only ribose or deoxyribose but also arabinose or dideoxyribose.
Hamamoto
T
T
Biochemicals Division, Yamasa Corporation, Chiba, Japan.
Noguchi
T
T
Midorikawa
Y
Y
D000595:Amino Acid Sequence; D001483:Base Sequence; D004926:Escherichia coli; D015870:Gene Expression; D005798:Genes, Bacterial; D001411:Geobacillus stearothermophilus; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016366:Open Reading Frames; D010770:Phosphotransferases / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D010957:Plasmids / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity
D011994:Recombinant Proteins; D010770:Phosphotransferases; C022375:phosphopentomutase