Download Advances in Microbial Physiology by R.K. Poole (Eds.) PDF

By R.K. Poole (Eds.)

This quantity is a part of a chain which supplies bills of development in microbial biology.

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1992). Wild-type E. , 1991). The biomass produced was similar to that of cultures grown in the absence of PQQ and the Yglucose decreased because of increased utilization of glucose. In contrast, when the bacteria were grown in the presence of PQQ under glucose limitation there was no accumulation of gluconate; this is because the affinity of glucose for the phosphotransferase system is much greater than that for glucose dehydrogenase. These results indicate that in cells grown in the absence of PQQ, under conditions of glucose excess, the respiratory chain was not working to full capacity; in the cells grown in the presence of PQQ, additional electron flow must have resulted from the oxidation of glucose to gluconate and presumably extra molecules of ATP were synthesized.

1997). , 1997). This respiration is likely to be by way of glucose dehydrogenase and unlikely to involve the glycolytic enzymes, but some rigorous experiments with appropriate mutants are needed to confirm this. It would also be of interest to determine if synthesis of the glucose dehydrogenase in K . pneumoniae is regulated in the same way as that of E. , 1993a). 4. Glucose Dehydrogenase in E. coli Escherichiu coli is a facultative anaerobe found in the intestines of mammals and also in water, particularly sewage effluent.

Some species can grow on glucose, metabolizing it by way of the Entner-Doudoroff pathway; others cannot do so, most strains of Acinetohacter calcoaceticus falling into this category. These strains usually synthesize an active glucose dehydrogenase and under certain growth conditions (for example carbon-limited growth on a mixture of glucose and acetate) they oxidize glucose to gluconate, which accumulates in the growth medium. This is consistent with the observation that when glucose was added to a chemostat culture of A .

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