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. 1989 Feb;86(3):876–880. doi: 10.1073/pnas.86.3.876

Binding and transcription of relaxed DNA templates by fractions of maize chloroplast extracts.

D Zaitlin 1, J Hu 1, L Bogorad 1
PMCID: PMC286581  PMID: 2644650

Abstract

Preparations of partially purified chloroplast DNA-dependent RNA polymerase from maize and some other plants transcribe cloned chloroplast genes preferentially and much more actively from appropriately negatively supercoiled templates than from relaxed templates. We have found that the polymerase in such fractions does not bind to promoter regions of the maize chloroplast genes psbA and rbcL on small linear DNA fragments but that some protein(s) in unfractionated chloroplast extracts does bind. DEAE chromatography of the extracts has permitted the separation of a DNA-binding fraction from the bulk of the RNA polymerase activity. The binding fraction contains plastid RNA polymerase activity that is relatively independent of template topology.

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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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