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Quaternary structure of quinoprotein ethanol dehydrogenase from Pseudomonas aeruginosa and its reoxidation with a novel cytochrome c from this organism.

ABSTRACT: Quinoprotein (2,7,9-tricarboxy-1H-pyrrolo-[2,3-f]quinoline-4,5-dione quinone form (PQQ)-containing) ethanol dehydrogenase (EDH) from Pseudomonas aeruginosa ATCC 17933 was purified to homogeneity. EDH has an alpha 2 beta 2 configuration and subunits comparable in size to those of methanol dehydrogenase (MDH). Compared with other PQQ-containing dehydrogenases, Ca2+ is rather loosely bound and it seems necessary for PQQ binding and stability of EDH. Two soluble cytochromes c were detected in extracts from ethanol-grown cells and both were purified. One of these has an alpha-band at 551 nm for its reduced form, the oxidized form being an excellent electron acceptor for the semiquinone form of EDH. Since this cytochrome is quite different from the already known cytochrome c551 (operating in nitrate respiration) of this organism, it is indicated here as cytochrome cEDH. Comparison of the N-terminal amino acid sequence of cytochrome cEDH with the complete sequence of cytochrome cL (the electron acceptor of MDH), cytochrome cH (the electron acceptor of cytochrome cL) and cytochrome c551 revealed some similarity only to internal stretches of amino acids of the last two. The other soluble cytochrome appeared to be the already-known cytochrome c556. Since it was not an electron acceptor for cytochrome cEDH (neither for EDH), cytochrome cH is lacking in the quinoprotein-EDH-ethanol oxidation system of P. aeruginosa. It seems, therefore, that the respiratory chains for MDH and EDH are different.

SUBMITTER: Schrover JM

PROVIDER: S-EPMC1132390 | biostudies-other | 1993 Feb

REPOSITORIES: biostudies-other

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Project description:At present there are strong indications that Pseudomonas aeruginosa exhibits an epidemic population structure; clinical isolates are indistinguishable from environmental isolates, and they do not exhibit a specific (disease) habitat selection. However, some important issues, such as the worldwide emergence of highly transmissible P. aeruginosa clones among cystic fibrosis (CF) patients and the spread and persistence of multidrug resistant (MDR) strains in hospital wards with high antibiotic pressure, remain contentious. To further investigate the population structure of P. aeruginosa, eight parameters were analyzed and combined for 328 unrelated isolates, collected over the last 125 years from 69 localities in 30 countries on five continents, from diverse clinical (human and animal) and environmental habitats. The analysed parameters were: i) O serotype, ii) Fluorescent Amplified-Fragment Length Polymorphism (FALFP) pattern, nucleotide sequences of outer membrane protein genes, iii) oprI, iv) oprL, v) oprD, vi) pyoverdine receptor gene profile (fpvA type and fpvB prevalence), and prevalence of vii) exoenzyme genes exoS and exoU and viii) group I pilin glycosyltransferase gene tfpO. These traits were combined and analysed using biological data analysis software and visualized in the form of a minimum spanning tree (MST). We revealed a network of relationships between all analyzed parameters and non-congruence between experiments. At the same time we observed several conserved clones, characterized by an almost identical data set. These observations confirm the nonclonal epidemic population structure of P. aeruginosa, a superficially clonal structure with frequent recombinations, in which occasionally highly successful epidemic clones arise. One of these clones is the renown and widespread MDR serotype O12 clone. On the other hand, we found no evidence for a widespread CF transmissible clone. All but one of the 43 analysed CF strains belonged to a ubiquitous P. aeruginosa "core lineage" and typically exhibited the exoS(+)/exoU(-) genotype and group B oprL and oprD alleles. This is to our knowledge the first report of an MST analysis conducted on a polyphasic data set.

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Quaternary structure of quinoprotein ethanol dehydrogenase from Pseudomonas aeruginosa and its reoxidation with a novel cytochrome c from this organism.

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