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

By R.K. Poole (Eds.)

This quantity is a part of a sequence which supplies debts of development in microbial biology.

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Of ADH Figure 15 - 02 0, - 0, - [ High oxygen tension ] [Low oxygen tension] cyanidesensitive - alternative oxldase cyanide insensitive o2 Electron transport chains involved in the oxidation of glucose. 42 PAT M. GOODWIN AND CHRIS ANTHONY In P . , 1982b). , 1997). As is often the case. the situation with the acetic acid bacteria is complex. , 1987). At low pH, however, a second ‘cyanide-insensitive’ and non-energygenerating pathway appears to operate. , 1989c, 1994). Many of the systems for glucose oxidation shown in Fig.

Figure 9 shows the axial interactions that are also involved in holding PQQ in place in the active site. with an abnormal absorption spectrum in the PQQ region (Nunn and Lidstrom, 1986a). The DNA sequences of these genes indicate that MxaA is a periplasmic protein, MxaK is cytoplasmic and MxaL is an integral membrane protein. , 1995). Reconstitution of active enzyme having the normal absorption spectrum was achieved by incubation of the purified enzyme with a high concentration of Ca2+ 24 PAT M.

Whatever the role of the quinoprotein (see Section 7), it must be coupled to an electron transport system, and for ATP production this must be arranged so as to produce a protonmotive force across the inner cytoplasmic membrane to drive ATP synthesis by the membrane ATP synthase (Anthony, 1988, 1993a). The type of electron transport system for the quinoprotein dehydrogenases depends on the type of enzyme and on the type of terminal oxidase present. These fall into two main functional categories: those that oxidize periplasmic cytochrome c (cytochrome aa3 and cytochrome co); and those that oxidize ubiquinol without the mediation of a cytochrome hcl complex (cytochromes ho, hd and ha) (Poole, 1988); most bacteria are able to synthesize only one of these two general types of oxidase, although more than one of the specific type may be produced.

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