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. 1985 Jun;162(3):925–932. doi: 10.1128/jb.162.3.925-932.1985

Effects of light, oxygen, and substrates on steady-state levels of mRNA coding for ribulose-1,5-bisphosphate carboxylase and light-harvesting and reaction center polypeptides in Rhodopseudomonas sphaeroides.

Y S Zhu, S Kaplan
PMCID: PMC215864  PMID: 2581935

Abstract

The mRNA levels specific for ribulose-1,5-bisphosphate carboxylase, light-harvesting I polypeptides alpha and beta, and reaction center polypeptides L and M were assayed by use of a series of DNA probes specific for each cognate mRNA. Both the steady-state amounts and sizes of the specific mRNAs were measured as a function of the light intensity incident to the culture, the presence or absence of oxygen, and the type of substrate present in the growth medium. Northern hybridization revealed at least two and possibly three transcripts for ribulose-1,5-bisphosphate carboxylase. The cellular level of mRNA specific for ribulose-1,5-bisphosphate carboxylase increased in consort with enzyme activity as a function of both light intensity and reducing state of the substrate. Neither mRNA nor enzyme activity was detectable in aerobically grown cells. For the light-harvesting I and reaction center polypeptides there exist two transcripts, the larger of which appears to be a polycistronic mRNA possessing information for all four polypeptides and a smaller transcript specific for only the alpha and beta polypeptides of the light-harvesting I complex. The regulation of each of these mRNAs was affected by light and oxygen, but was not significantly affected by the oxidation-reduction state of the substrate.

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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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