Pseudomonas cepacia mutants blocked in the Entner-Doudoroff pathway.

Abstract:

:Pseudomonas cepacia mutants deficient in either 6-phosphogluconate (6PGA) dehydratase (Edd-) or 2-keto-3-deoxy-6-phosphogluconate (KDPG) aldolase (Eda-) failed to utilize glucose or gluconate despite the prominence of of 6-phosphogluconate dehydrogenase (6PGAD) ii this bacterium and the potential for utilizing the pentose shunt suggested by its growth on ribitol and xylose. The Eda- strains grew normally on glucuronic acid, indicating that in P. cepacia its degradation does not depend upon KDPG aldolase as it does in Escherichia coli. Both 6PGA dehydratase and KDPG aldolase were inducible enzymes, with 6PGA rather than gluconate the apparent inducer. Edd- as well as Eda- strains were sensitive to growth inhibition by glucose, gluconate, fructose, and related carbohydrates when these substrates were present in combination with alternate carbon sources such as citrate or phthalate, presumably as a consequence of accumulation and toxicity of 6PGA, KDPG, or both. Edd- mutants were somewhat less sensitive to such inhibition than were Eda- strains. Certain derivatives of the Edd- strains we examined were able to utilize gluconate despite their deficiency of 6PGA dehydratase. Such mutants formed higher levels of 6PGAD than did the wild type. It is likely that the elevated levels of 6PGAD in these strains prevents accumulation of toxic levels of 6PGA that would otherwise result from a block in he Entner-Doudoroff pathway. The results suggest that P. cepacia can mutate to grow slowly on gluconate utilizing only the pentose shunt.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Allenza P,Lessie TG

doi

10.1128/JB.150.3.1340-1347.1982

subject

Has Abstract

pub_date

1982-06-01 00:00:00

pages

1340-7

issue

3

eissn

0021-9193

issn

1098-5530

journal_volume

150

pub_type

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