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Abstract
The Acetobacter xylinum gene (celB) encoding phosphoglucomutase (EC 5·4.2·2) has previously been cloned by complementation of cellulose-negative mutants. In the present report the nucleotide sequence of a 2·0 kb DNA fragment containing celB is described. Expression analysis using the bacteriophage T7 RNA polymerase promoter ø10 resulted in identification of a probable translational start codon of celB, and this conclusion was confirmed by N-terminal amino acid sequencing of the recombinant protein. From the nucleotide sequence data it was deduced that celB encodes a protein with a calculated molecular mass of 59·6 kDa. A protein of similar size was visualized after in vitro transcription and translation, using the cloned 2·0 kb fragment as template. The results of an amino acid sequence comparison and a biochemical analysis indicated that the CelB protein is structurally and functionally related to the previously characterized human and rabbit phosphoglucomutases.
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