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. 1994 Jul;14(7):4350–4359. doi: 10.1128/mcb.14.7.4350

Identification of a transcriptional activator-binding element in the 27-kilodalton zein promoter, the -300 element.

T Ueda 1, Z Wang 1, N Pham 1, J Messing 1
PMCID: PMC358806  PMID: 8007944

Abstract

By utilizing a homologous transient-expression system, we have shown that a 58-bp sequence from the gamma-class 27-kDa zein promoter, spanning from -307 to -250 relative to the transcription start site, confers a high level of transcriptional activity on a truncated plant viral promoter. The transcriptional activity mediated by the 58-bp sequence is orientation independent, and it is further enhanced as a result of its multimerization. A similarly high level of transcriptional activity was also observed in protoplasts isolated from leaf tissue-derived maize suspension cells. In vitro binding and DNase I footprinting assays with nuclear protein prepared from cultured endosperm cells revealed the sequence-specific binding of a nuclear factor(s) to a 16-nucleotide sequence present in the 58-bp region. The nuclear factor binding sequence includes the -300 element, a cis-acting element highly conserved among different zein genes and many other cereal storage protein genes. A 23-bp oligonucleotide sequence containing the nuclear factor binding site is sufficient for binding the nuclear factor in vitro. It also confers a high level of transcriptional activity in vivo, but in an orientation-dependent manner. Four nucleotide substitutions in the -300 element drastically reduced binding and transcriptional activation by the nuclear factor. The same nuclear factor is abundant in the developing kernel endosperm and binds to the -300 element region of the 27-kDa or the alpha-class zein promoter. These results suggest that the highly conserved -300 element is involved in the common regulatory mechanisms mediating the coordinated expression of the zein genes.

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