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

By R.K. Poole (Eds.)

ISBN-10: 0120277409

ISBN-13: 9780120277407

This quantity is a part of a chain which supplies money owed of growth in microbial biology.

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Why this region has such a relatively high level of identity is not known but it provides the most obvious region for designing DNA probes for use in the identification of genes coding for PQQ-dependent quinoproteins. 6. QUINOPROTEINS IN ENERGY TRANSDUCTION The PQQ-dependent dehydrogenases all function in respiration and usually also in energy transduction; in all cases so far investigated, this involves the oxidation of substrates in the periplasm of Gram-negative bacteria (Table 1). This contrasts with oxidation systems involving the membrane flavoproteins which catalyse reactions on the inner face of the cytoplasmic membrane.

The sequence of the catalytic subunit of the type 111 alcohol dehydrogenase, which contains PQQ, has an N-terminal region of 600 residues with 31% identity to the methanol dehydrogenase sequence; this is followed by a C-terminal extension containing a haem-binding site (Fig. 5). In the membrane glucose dehydrogenase, by contrast, the N-terminal region (residues 1-154) forms a membrane anchor with five transmembrane segments and this region is likely to contain the ubiquinone binding site. 1) and, although the overall identity level is not particularly high, i t has been possible to use the sequences of the alcohol dehydrogenase and glucose dehydrogenase, together with the coordinates of the methanol dehydrogenase, to produce reliable model structures of the 'superbarrel regions' (Fig.

Although the hexose monophosphate pathway can effect the complete oxidation of glucose, its main function is usually to provide Cs sugars and NADPH for biosynthesis. In organisms which contain an active glucose dehydrogenase, there is a fourth variant for glucose metabolism sometimes referred to as the direct (non-phosphorylating) oxidation pathway, glucose being oxidized in the periplasm (Fig. 16). This route is widely distributed among Gram-negative bacteria but a major bioenergetic advantage has not been obvious for this pathway and it was often referred to as a ‘dissimilatory by-pass’, expressing the apparent inefficient use of glucose.

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


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