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Science 7 December 1990:
Vol. 250. no. 4986, pp. 1397 - 1399
DOI: 10.1126/science.2255908
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Articles
Science, Vol 250, Issue 4986, 1397-1399
Copyright © 1990 by American Association for the Advancement of Science
A trans-acting factor that binds to a GT-motif in a phytochrome gene promoter
K Dehesh,
WB Bruce,
and
PH Quail
University of California, Berkeley/U.S. Department of Agriculture, Plant Gene Expression Center, Albany 94710.
The regulatory photoreceptor, phytochrome, controls the expression of numerous genes, including its own phyA genes, which are transcriptionally repressed in response to light. Functional analysis of a rice phyA gene promoter, by means of microprojectile-mediated gene transfer, indicates that a GT motif, GCGGTAATT, closely related to elements in the promoters of a number of other light-regulated genes, is critical for expression. Partial complementary DNA clones have been obtained for a rice nuclear protein, designated GT-2, that binds in a highly sequence-specific fashion to this motif. Mutational analysis shows that the paired G's are most crucial to binding. GT-2 has domains related to certain other transcription factors. Northern blot analysis shows that GT-2 messenger RNA levels decline in white light although red and far red light pulses are ineffective.
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