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. 1983 Aug;155(2):926–929. doi: 10.1128/jb.155.2.926-929.1983

Nif- Hup- mutants of Rhizobium japonicum.

F Moshiri, L Stults, P Novak, R J Maier
PMCID: PMC217773  PMID: 6874648

Abstract

Two H2 uptake-negative (Hup-) Rhizobium japonicum mutants were obtained that also lacked symbiotic N2 fixation (acetylene reduction) activity. One of the mutants formed green nodules and was deficient in heme. Hydrogen oxidation activity in this mutant could be restored by the addition of heme plus ATP to crude extracts. Bacteroid extracts from the other mutant strain lacked hydrogenase activity and activity for both of the nitrogenase component proteins. Hup+ revertants of the mutant strains regained both H2 uptake ability and nitrogenase activity.

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Selected References

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