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. 1987 Sep;6(9):2543–2549. doi: 10.1002/j.1460-2075.1987.tb02542.x

Sequence-specific interactions of a pea nuclear factor with light-responsive elements upstream of the rbcS-3A gene.

P J Green 1, S A Kay 1, N H Chua 1
PMCID: PMC553672  PMID: 3678200

Abstract

Pea nuclear extracts were used in gel retardation assays and DNase I footprinting experiments to identify a protein factor that specifically interacts with regulatory DNA sequences upstream of the pea rbcS-3A-gene. This factor, designated GT-1, binds to two short sequences (boxes II and III) in the -150 region that are known to function as light-responsive elements (LREs) in transgenic tobacco. Binding of GT-1 to homologous sequences further upstream (boxes II and III in the -220 region) indicates that these boxes comprise the redundant LRE that functions in vivo when boxes II and III are deleted. In both box II and box II, methylation interference experiments demonstrate that two adjacent G residues are critical for GT-binding. Single Gs present in boxes III and III are also important. Since GT-1 is present in nuclear extracts from leaves of light-grown and dark-adapted pea plants, its regulatory role does not depend on de novo synthesis. Thus if GT-1 binds differentially in vivo it must be postranslationally modified or sterically blocked from binding by another factor in response to light.

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