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. 1997 Dec;115(4):1359–1369. doi: 10.1104/pp.115.4.1359

Sequencing, genomic organization, and preliminary promoter analysis of a black cherry (R)-(+)-mandelonitrile lyase gene.

Z Hu 1, J E Poulton 1
PMCID: PMC158601  PMID: 9414550

Abstract

The flavoprotein (R)-(+)-mandelonitrile lyase (MDL; EC 4.1.2.10) plays a key role in cyanogenesis in rosaceous stone fruits. An MDL gene (mdl3) and its corresponding cDNA (MDL3) were isolated from black cherry (Prunus serotina) and characterized. The mdl3 gene contains 2292 bp of the 5' flanking region, the entire coding region, and 300 bp of the 3' flanking region. The coding region is interrupted by three short introns, of which one possesses the usual GC-AG splice junction dinucleotides. This gene encodes a polypeptide of 573 amino acids that includes a putative signal sequence, 13 potential N-glycosylation sites, and a presumptive flavin adenine dinucleotide-binding site. To determine whether the 5' flanking region of the mdl3 gene is capable of driving MDL expression, it was fused to the beta-glucuronidase reporter gene for Agrobacterium-mediated transformation into tobacco. Matching endogenous MDL expression patterns, beta-glucuronidase staining was observed in maturing embryos and seeds; it also occurred in postembryonic tissues, especially in association with vascular tissues. After developing a homologous transient transformation system to facilitate identification of putative regulatory sequences, we demonstrated that 125 bp (-107 to +18) of the 5' flanking sequence of the mdl3 gene is sufficient for MDL expression in protoplasts derived from immature black cherry embryos.

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Selected References

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