title: Expressed sequence tags and molecular cloning and characterization of gene encoding pinoresinol/lariciresinol reductase from Podophyllum hexandrum.
abstract: Podophyllotoxin, an aryltetralin lignan, is the source of important anticancer drugs etoposide, teniposide, and etopophos. Roots/rhizome of Podophyllum hexandrum form one of the most important sources of podophyllotoxin. In order to understand genes involved in podophyllotoxin biosynthesis, two suppression subtractive hybridization libraries were synthesized, one each from root/rhizome and leaves using high and low podophyllotoxin-producing plants of P. hexandrum. Sequencing of clones identified a total of 1,141 Expressed Sequence Tags (ESTs) resulting in 354 unique ESTs. Several unique ESTs showed sequence similarity to the genes involved in metabolism, stress/defense responses, and signalling pathways. A few ESTs also showed high sequence similarity with genes which were shown to be involved in podophyllotoxin biosynthesis in other plant species such as pinoresinol/lariciresinol reductase. A full length coding sequence of pinoresinol/lariciresinol reductase (PLR) has been cloned from P. hexandrum which was found to encode protein with 311 amino acids and show sequence similarity with PLR from Forsythia intermedia and Linum spp. Spatial and stress-inducible expression pattern of PhPLR and other known genes of podophyllotoxin biosynthesis, secoisolariciresinol dehydrogenase (PhSDH), and dirigent protein oxidase (PhDPO) have been studied. All the three genes showed wounding and methyl jasmonate-inducible expression pattern. The present work would form a basis for further studies to understand genomics of podophyllotoxin biosynthesis in P. hexandrum.
authors: National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India.
authors: Dhammaprakash Pandhari
authors: DP
authors: Wankhede
authors: Dipul Kumar
authors: DK
authors: Biswas
authors: Subramani
authors: S
authors: Rajkumar
authors: Alok Krishna
authors: AK
authors: Sinha
mesh_terms: D000429:Alcohol Oxidoreductases / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D053898:Biosynthetic Pathways / Q000235:genetics; D003001:Cloning, Molecular; D020224:Expressed Sequence Tags / Q000378:metabolism*; D005663:Furans / Q000378:metabolism*; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D015723:Gene Library; D017343:Genes, Plant / Q000235:genetics*; D017705:Lignans / Q000378:metabolism*; D008969:Molecular Sequence Data; D064430:NAD (+) and NADP (+) Dependent Alcohol Oxidoreductases; D010088:Oxidoreductases / Q000737:chemistry / Q000235:genetics; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011034:Podophyllotoxin / Q000096:biosynthesis; D011035:Podophyllum / Q000201:enzymology* / Q000235:genetics*; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013312:Stress, Physiological
chemical_list: D005663:Furans; D017705:Lignans; D010940:Plant Proteins; D010088:Oxidoreductases; D000429:Alcohol Oxidoreductases; D064430:NAD (+) and NADP (+) Dependent Alcohol Oxidoreductases; C084968:lariciresinol reductase; C426673:secoisolariciresinol dehydrogenase; D011034:Podophyllotoxin; C103298:pinoresinol
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