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. 1984 Jul;159(1):80–85. doi: 10.1128/jb.159.1.80-85.1984

Catabolism of carbohydrates and organic acids and expression of nitrogenase by azospirilla.

G Martinez-Drets, M Del Gallo, C Burpee, R H Burris
PMCID: PMC215595  PMID: 6588050

Abstract

Fructose, galactose, L-arabinose, gluconate, and several organic acids support rapid growth and N2 fixation of Azospirillum brasiliense ATCC 29145 (strain Sp7) as a sole source of carbon and energy. Growth of Azospirillum lipoferum ATCC 29707 (strain Sp59b) is also supported by glucose, mannose, mannitol, and alpha-ketoglutarate. Oxidation of fructose and gluconate by A. brasiliense Sp7 and of glucose, gluconate, and fructose by A. lipoferum Sp59b was achieved through inducible enzymatic mechanisms. Both strains exhibited all of the enzymes of the Embden-Meyerhof-Parnas pathway, and strain Sp59b also possesses all the enzymes of the Entner-Doudoroff pathway. Fluoride inhibited growth on fructose (strains Sp7 and Sp59b) or on glucose (strain Sp59b) but not on malate. There was no activity via the oxidative hexose monophosphate pathway in either strain. There was greater activity with 1-phosphofructokinase than with 6-phosphofructokinase in both strains. Strain Sp59b formed fructose-6-phosphate via hexokinase, an enzyme that is lacking in strain Sp7. A. brasiliense and A. lipoferum exhibited the enzymes both of the tricarboxylic acid cycle and of the glyoxylate shunt; iodoacetate, fluoropyruvate, and malonate were inhibitory. A. brasiliense Sp7 could not transport [14C]glucose and alpha-[14C]ketoglutarate into its cells.

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Selected References

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