Abstract
Cinnamate 4-hydroxylase (C4H) is one of the enzymes involved at the starting point of
the phenylpropanoid and lignin biosynthesis pathway. It involves in the hydroxylation
of cinnamate to 4-coumarate. In this paper, we isolated and in silico characterized the
complete sequence of cinnamate 4-hydroxylase (C4H) gene from Neolamarckia
cadamba in Malaysia. The C4H singletons obtained from the NcdbEST were used to
predict the hypothetical full-length of NcC4H through the contig mapping approach.
RT-PCR was used to amplify the full-length C4H cDNA clone and subsequently the
PCR amplicons were sequenced and analysed. The NcC4H cDNA was 1,651 bp long
with a 505 amino acid sequence, a 18 bp 5’-UTR and a 115 bp 3’-UTR. The predicted
NcC4H protein contains P450-featured motifs. These include the heme-binding
domain, a threonine-containing binding pocket motif and the proline-rich region.
Peptide sequence comparison and phylogenetic analyses revealed that NcC4H was
clustered with class I C4H instead of class II C4H, which is preferentially involved in
phenylpropanoid and lignin biosynthesis pathway. This full-length NcC4H cDNA can
be used for developing genetic marker to identify economic trait loci (ETL) for wood
quality traits via genomics-assisted selection (GAS) or candidate gene mapping
approach.
Boon Ling, Wei Seng, Shek Ling. (2018) Isolation and in silico characterization of cinnamate 4-hydroxylase (C4H) gene controlling the early stage of phenylpropanoid biosynthetic pathway in Kelampayan (Neolamarckia cadamba, Rubiaceae) developing xylem tissues, Asian Journal of Agriculture and Biology, Volume 6, Issue 2.
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