Abstract
Sites of DNA-protein interaction were mapped in the promoter regions of two of the five genes encoding the small subunit of ribulose-1,5-bisphosphate carboxylase (rbcS) in tomato. The two genes, designated rbcS3B and -3C, are actively transcribed in cotyledons of light-grown seedlings and in leaves, but are transcriptionally inactive cotyledons of dark-grown seedlings, in young and mature tomato fruit, and in roots. The combination and order of conserved DNA sequence elements in the promoter regions of the two genes are essentially identical, but differ considerably from that found in the promoters of the other three tomato rbcS genes, which show different transcription patterns. Nuclear extracts from cotyledons of 7-day-old tomato seedlings, and from leaves and young tomato fruit of mature plants defined multiple DNase I-protected sites in the promoter regions of both genes. The protection patterns were organspecific, and encompassed previously identified conserved DNA sequence motifs as well as uncharacterized sequences. In contrast, nuclear extracts from mature tomato fruit and roots of 7-day-old seedlings failed to protect any of the promoter sequences, implying that DNA-binding proteins required for transcription of rbcS3B and -3C are inactive in these organs. These results are somewhat surprising since DNA-binding proteins from cotyledons of dark-grown seedlings and young fruit interact with the two promoters, although rbcS3B and -3C are not transcribed in these organs. The basis for transcriptional regulation of these two genes is discussed and the detailed pattern of DNase I protection in the promoter regions of the two genes is presented.
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Carrasco, P., Manzara, T. & Gruissem, W. Developmental and organ-specific changes in DNA-protein interactions in the tomato rbcS3B and rbcS3C promoter regions. Plant Mol Biol 21, 1–15 (1993). https://doi.org/10.1007/BF00039613
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DOI: https://doi.org/10.1007/BF00039613