Summary
The small subunit (RbcS) of ribulose bisphosphate carboxylase (RuBPCase) is encoded by eight genes in Petunia (Mitchell). These genes can be divided into three subfamilies (51, 117 and 71) based upon hybridization to three petunia rbcS cDNA clones. The nucleotide sequence of six of the eight petunia rbcS genes is presented here and the structure of the genes is discussed with respect to their genomic linkage and their expression levels in petunia leaf tissue. The rbcS genes belonging to the same subfamily encode an identical mature RbcS polypeptide, however the different subfamilies encode distinguishable polypeptides. All the genes, except one, contian two introns within the mature subunit coding region; one gene contains one extra intron within the coding region. There are large regions of nucleotide sequence homology within the introns of genes within a subfamily, but significantly less homology between the introns of genes of different subfamilies. A complex pattern of homology within the multiple genes of the 51 subfamily is observed. There are regions within these genes which share high levels of sequence homology; this homology does not extend throughout the whole gene and the regions of homology do not always occur in adjacent genes. Two 3′ rbcS gene fragments which we isolated from the petunia genome show high levels of homology to two of the intact rbcS genes.
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Communicated by R.B. Goldberg
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Dean, C., van den Elzen, P., Tamaki, S. et al. Molecular characterization of the rbcS multi-gene family of Petunia (Mitchell). Mol Gen Genet 206, 465–474 (1987). https://doi.org/10.1007/BF00428887
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DOI: https://doi.org/10.1007/BF00428887