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. 1988 Jan;170(1):5–11. doi: 10.1128/jb.170.1.5-11.1988

Transposon mutagenesis and physiological analysis of strains containing inactivated form I and form II ribulose bisphosphate carboxylase/oxygenase genes in Rhodobacter sphaeroides.

D L Falcone 1, R G Quivey Jr 1, F R Tabita 1
PMCID: PMC210598  PMID: 2826406

Abstract

Strains of Rhodobacter sphaeroides (Rhodopseudomonas sphaeroides) were constructed such that either the gene encoding form I ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBPC-O) or the gene encoding form II RuBPC-O was inactivated. Both strains were capable of photoheterotrophic growth with malate as the electron donor, with only slight differences in growth rate and overall carboxylase specific activity compared with the wild-type strain. Photolithotrophic growth with 1.5% CO2 in hydrogen was also possible for R. sphaeroides strains containing only one of the two RuBPC-O enzyme forms, although the differences in growth rates between wild-type and carboxylase mutant strains were greater under these conditions. These results indicate that the two forms of RuBPC-O are independently regulated. In addition, the regulatory system governing RuBPC-O synthesis may, in some cases, compensate for the lack of the missing enzyme.

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Selected References

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