PMID: 9426598Jan 14, 1998Paper

Characterization and heterologous expression of hydroxycinnamoyl/benzoyl-CoA:anthranilate N-hydroxycinnamoyl/benzoyltransferase from elicited cell cultures of carnation, Dianthus caryophyllus L

Plant Molecular Biology
Q YangUlrich Matern

Abstract

Benzoyl-CoA:anthranilate N-benzoyltransferase catalyzes the first committed reaction of phytoalexin biosynthesis in carnation (Dianthus caryophyllus L.), and the product N-benzoylanthranilate is the precursor of several sets of dianthramides. The transferase activity is constitutively expressed in suspension-cultured carnation cells and can be rapidly induced by the addition of yeast extract. The enzyme was purified to homogeneity from yeast-induced carnation cells and shown to consist of a single polypeptide chain of 53 kDa. Roughly 20% of the sequence was identified by micro-sequencing of tryptic peptides, and some of these sequences differed in a few amino acid residues only suggesting the presence of isoenzymes. A specific 0.8 kb cDNA probe was generated by RT-PCR, employing degenerated oligonucleotide primers complementary to two of the tryptic peptides and using poly(A)+ RNA from elicited carnation cells. Five distinct benzoyltransferase clones were isolated from a cDNA library, and three cDNAs, pchcbt1-3, were sequenced and shown to encode full-size N-benzoyltransferases. The translated peptide sequences revealed more than 95% identity among these three clones. The additional two clones harbored insert sequences mostly h...Continue Reading

Citations

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