ArticlePlant molecular biology1995
A GCC element and a G-box motif participate in ethylene-induced expression of the PRB-1b gene.
Article in Plant molecular biology, 1995. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 51 papers.
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51 citing papers in PubMed, 139 citations in OpenAlex.
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Corrections and comments
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The PRB-1b gene codes for a basic-type pathogenesis-related protein and is activated at the transcriptional level by the plant hormone ethylene. To identify cis-acting DNA elements essential for ethylene induction, deleted and mutant forms of the PRB-1b promoter, fused to the beta-glucuronidase (GUS) coding region, were introduced in transgenic tobacco plants. A 73 bp fragment (X1 region) of the PRB-1b promoter, located between positions -213 and -141, was sufficient to confer ethylene responsiveness to the reporter gene. The X1 region contains a TAAGAGCCGCC motif (GCC-box) well conserved in several ethylene-inducible genes. A substitution mutation in this sequence, in the context of a 213 bp PRB-1b promoter, completely abolished ethylene induction in transgenic tobacco, defining this conserved motif as part of a cis-acting element responsive to ethylene. Three other mutations in the X1 region caused a pronounced decrease in the PRB-1b promoter activity in transgenic plants, but did not affect ethylene inducibility. One of them, localized in a G-box like motif (CACGTG), disrupted the binding site for a nuclear factor, as observed in gel-shift analysis. Interestingly, the mobility of the complex formed on the G-box element was dependent on its phosphorylation state. These results suggest that a cis-acting element involved in the perception of the ethylene signal resides in a GCC motif and acts in concert with additional elements in the regulation of ethylene-induced PRB-1b expression.
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