Recent Advances in Lignan OMT Studies
Recent Advances in Lignan OMT Studies
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DOI:
10.2488/jwrs.65.1
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发表时间:
2019-01
影响因子:
0.3
通讯作者:
T. Umezawa;M. Yamamura;Eiichiro Ono;A. Shiraishi;S. Ragamustari
中科院分区:
文献类型:
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作者:
T. Umezawa;M. Yamamura;Eiichiro Ono;A. Shiraishi;S. Ragamustari
Lignans are phenylpropanoid dimers, where the phenylpropane units are linked by the central carbon (C8) of their propyl side chains. Lignans vary substantially in the chemical structure of their basic carbon frameworks, oxidation levels, and aromatic substitution patterns. (cid:9491)-Methylation on the aromatic rings is often crucial in determining the final product distribution. In the secondary or specialized metabolic processes of plants, (cid:9491)-methylation is usually catalyzed by (cid:9495)-adenosyl-L-methionine-dependent (cid:9491)-methyltransferases (OMTs). We have so far isolated six cDNAs encoding lignan OMTs : (cid:9479)(cid:9509)(cid:9526)(cid:9528)(cid:9516)(cid:9509)(cid:9521)(cid:9529)(cid:9527)(cid:9444)(cid:9528)(cid:9517)(cid:9522)(cid:9511)(cid:9528)(cid:9523)(cid:9526)(cid:9517)(cid:9529)(cid:9527) matairesinol OMT (cid:9495)(cid:9513)(cid:9527)(cid:9509)(cid:9521)(cid:9529)(cid:9521)(cid:9444)(cid:9517)(cid:9522)(cid:9512)(cid:9517)(cid:9511)(cid:9529)(cid:9521) matairesinol OMT (FkMROMT). Phylogenetic tree analysis indicated that CtMROMT and AsMROMT formed a small clade with plant OMTs including caffeic acid (cid:9491)-methyltransferase from (cid:9494)(cid:9523)(cid:9527)(cid:9509)(cid:9444)(cid:9511)(cid:9516)(cid:9517)(cid:9522)(cid:9513)(cid:9522)(cid:9527)(cid:9517)(cid:9527) var. (cid:9527)(cid:9524)(cid:9523)(cid:9522)(cid:9528)(cid:9509)(cid:9522)(cid:9513)(cid:9509) (RcOMT3) and reticuline 7-(cid:9491)-methyltransferase from (cid:9492)(cid:9509)(cid:9524)(cid:9509)(cid:9530)(cid:9513)(cid:9526)(cid:9444)(cid:9527)(cid:9523)(cid:9521)(cid:9522)(cid:9517)(cid:9514)(cid:9513)(cid:9526)(cid:9529)(cid:9521) (PsOMT1). By contrast, in the phylogenetic tree SiOMT1 and SrOMT1 were located closely to the clade containing 5-hydroxyconiferaldehyde OMTs [CAldOMTs, caffeic acid OMTs (CAOMTs)]. AsTJOMT and FkMROMT were located in a small clade which is somewhat close to the clade of SiOMT1, SrOMT1, and CAldOMTs. In addition, two lignan OMT genes, (cid:9492)(cid:9516)(cid:9491)(cid:9489)(cid:9496)(cid:9461) and (cid:9492)(cid:9516)(cid:9491)(cid:9489)(cid:9496)(cid:9463), arisen independently in various lignan-producing plants via acquisition of substrate specificity for lineage-specific lignan structures. These findings on lignan OMTs provide useful information for further identification of cDNAs encoding other lignan OMTs, as well as clues to understand diversity and plasticity of plant secondary metabolism beyond lignan biosynthesis.