Spacing between GT-1 binding sites within a light-responsive element is critical for transcriptional activity

Gilmartin, P.M. and Chua, N.-H. (1990) Spacing between GT-1 binding sites within a light-responsive element is critical for transcriptional activity. The Plant Cell, 2 (5). pp. 447-455. ISSN 1040-4651

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Abstract

Dissection of the light-responsive element (LRE) located between -166 and -50 of rbcS-3A from pea has revealed critical spacing requirements between the two GT-1 binding sites for light-responsive transcription. An increase in spacing between the two sites by as little as 2 bp reduces dramatically the rbcS-3A transcript levels in vivo. Mutation of the 10 bp between the binding sites leads to slightly lower transcript levels, as do deletions of either 3 bp or 8 bp. Deletions of 5 bp or 7 bp from between the GT-1 binding sites do not affect rbcS-3A transcript levels; however, a deletion of 10 bp virtually abolishes the activity of this element. These spacing changes within the light-responsive element similarly affect transcription of a divergently oriented and truncated nopaline synthase promoter. Most spacing changes between the two GT-1 binding sites, however, do not impair the binding of GT-1 to this element in vitro. Together with previous observations, these results suggest that the nuclear factor GT-1 may interact with the binding sites in either a productive or nonproductive manner and that GT-1 binding is necessary but not sufficient for light-responsive transcription. We also discuss our results in relation to the observed spacing of similar sequence elements present within other light-responsive promoters.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
University of East Anglia > Faculty of Science > Research Groups > Plant Sciences
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Depositing User: Pure Connector
Date Deposited: 01 Nov 2013 14:30
Last Modified: 25 Jul 2018 08:46
URI: https://ueaeprints.uea.ac.uk/id/eprint/44134
DOI:

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