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Assay for UDPglucose 6-dehydrogenase in phosphate-starved cells: gene tuaD of Bacillus subtilis 168 encodes the UDPglucose 6-dehydrogenase involved in teichuronic acid synthesis.

Microbiology (Reading, Engl.). 1999 May;145 ( Pt 5):1049-1053. doi:10.1099/13500872-145-5-1049
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摘要


A novel assay permitting the detection of UDPglucose 6-dehydrogenase activity in cell-free extracts obtained from phosphate-starved cultures of Bacillus subtilis is described. The critical step, the separation of phosphate-starvation-induced exo-enzymes, phosphatases and phosphodiesterases from the cytoplasmic fraction containing the UDPglucose dehydrogenase, was achieved by protoplasting and removal of the periplasmic fraction by protoplast washing. Using this method, the following were unambiguously demonstrated: (i) the presence in the cytoplasm of an enzymic activity oxidizing UDPglucose to UDPglucuronic acid, and (ii) that detection of the activity in whole-cell-free extracts is prevented by the presence of 'periplasmic' enzymes catalysing the degradation of the sugar nucleotides. With this method, several B. subtilis 168 mutants unable to synthesize teichuronic acid were examined. Strains inactivated in gene tuaD, whose product shares homology with UDPglucose 6-dehydrogenase and GDPmannose 6-dehydrogenase from other organisms, were shown to lack UDPglucose 6-dehydrogenase activity. Anion exchange chromatography revealed that mutants deficient in tuaD lacked a cytoplasmic UDPglucuronate pool.

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