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. 1981 Jan;145(1):533–540. doi: 10.1128/jb.145.1.533-540.1981

Rhizobium japonicum mutant strains unable to grow chemoautotrophically with H2.

R J Maier
PMCID: PMC217303  PMID: 6780521

Abstract

Rhizobium japonicum strain SR grows chemoautotrophically on a mineral salts medium when incubated in an H2- and CO2-containing atmosphere. Mutant strains unable to grow or that grow very poorly chemoautotrophically with H2 have been isolated from strain SR. The mutant isolation procedure involved mutagenesis with ethyl methane sulfonate, penicillin selection under chemoautotrophic growth conditions, and plating of the survivors onto medium containing carbon. The resulting colonies were replica plated onto medium that did not contain carbon, and the plates were incubated in an H2- and CO2-containing atmosphere. Mutant strains unable to grow under these conditions were chosen. Over 100 mutant strains with defects in chemoautotrophic metabolism were obtained. The phenotypes of the mutants fall into various classes. These include strains unable to oxidize H2 and strains deficient in CO2 uptake. Some of the mutant strains were capable of oxidizing H2 only when artificial electron acceptors were provided. Two mutant strains specifically lack activity of the key CO2-fixing enzyme ribulose 1,5-bisphosphate carboxylase. Other mutant strains lack both H2-oxidizing ability and ribulose 1,5-bisphosphate carboxylase activity.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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