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Opium poppy: blueprint for an alkaloid factory

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Abstract

Opium poppy (Papaver somniferum) produces a large number of benzylisoquinoline alkaloids, including the narcotic analgesics morphine and codeine, and has emerged as one of the most versatile model systems to study alkaloid metabolism in plants. As summarized in this review, we have taken a holistic strategy—involving biochemical, cellular, molecular genetic, genomic, and metabolomic approaches—to draft a blueprint of the fundamental biological platforms required for an opium poppy cell to function as an alkaloid factory. The capacity to synthesize and store alkaloids requires the cooperation of three phloem cell types—companion cells, sieve elements, and laticifers—in the plant, but also occurs in dedifferentiated cell cultures. We have assembled an opium poppy expressed sequence tag (EST) database based on the attempted sequencing of more than 30,000 cDNAs from elicitor-treated cell culture, stem, and root libraries. Approximately 23,000 of the elicitor-induced cell culture and stem ESTs are represented on a DNA microarray, which has been used to examine changes in transcript profile in cultured cells in response to elicitor treatment, and in plants with different alkaloid profiles. Fourier transform-ion cyclotron resonance mass spectrometry and proton nuclear magnetic resonance mass spectroscopy are being used to detect corresponding differences in metabolite profiles. Several new genes involved in the biosynthesis and regulation of alkaloid pathways in opium poppy have been identified using genomic tools. A biological blueprint for alkaloid production coupled with the emergence of reliable transformation protocols has created an unprecedented opportunity to alter the chemical profile of the world’s most valuable medicinal plant.

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Abbreviations

4′OMT:

(R,S)-3′-hydroxy-N-methylcoclaurine 4′-O-methyltransferase

6OMT:

(R,S)-norcoclaurine 6-O-methyltransferase

7OMT:

(R,S)-reticuline 7-O-methyltransferase

BBE:

Berberine bridge enzyme

BIA:

Benzylisoquinoline alkaloid

CDO:

(S)-canadine oxidase

CFS:

(S)-cheilanthifoline synthase

CNMT:

(R,S)-coclaurine N-methyltransferase

COR:

Codeinone reductase

CYP719A1:

(S)-canadine synthase

CYP80B1:

(S)-N-methylcoclaurine 3′-hydroxylase

DBOX:

Dihydrobenzophenanthridine oxidase

DRS:

1,2-Dehydroreticuline synthase

DRR:

1,2-Dehydroreticuline reductase

dsRNA:

Double-stranded RNA

EMS:

Ethylmethane sulfonate

ER:

Endoplasmic reticulum

EST:

Expressed sequence tag

FT-ICR MS:

Fourier transform-ion cyclotron resonance mass spectrometry

GST:

Glutathione S-transferase

H1-NMR:

Proton nuclear magnetic resonance mass spectroscopy

HSS:

Homospermidine synthase

LC-MS/MS:

Liquid chromatography-tandem mass spectrometry

MSH:

(S)-N-methylstylopine 14-hydroxylase

NCS:

(S)-norcoclaurine synthase

PCR:

Polymerase chain reaction

P6H:

Protopine 6-hydroxylase

PNMT:

Putrescine N-methyltransferase

PTGS:

Post-transcriptional gene silencing

RNAi:

RNA interference

SAM:

(S)-adenosylmethionine

SAT:

Salutaridinol-7-O-acetyltransferase

SER:

Sieve element reticulum

siRNA:

RNA

SOMT:

(S)-scoulerine 9-O-methyltransferase

SOR:

Salutaridine:NADPH 7-oxidoreductase

SPS:

(S)-stylopine synthase

STOX:

(S)-tetrahydroprotoberberine oxidase

STR:

Strictosidine synthase

STS:

Salutaridine synthase

TDC:

Tryptophan decarboxylase

TILLING:

Targeting induced local lesions in genomes

TYDC:

Tyrosine decarboxylase

TNMT:

(S)-tetrahydroprotoberberine-cis-N-methyltransferase

TRV:

Tobacco rattle virus

VIGS:

Viral-induced gene silencing

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Acknowledgements

We thank David Bird for the preparation of the electron and immunofluorescence micrograms. Research was funded by grants from the Natural Sciences and Engineering Research Council (NSERC) of Canada to P.J.F., who also holds the Canada Research Chair in Plant Biotechnology. J.M.H is the recipient of an Alberta Ingenuity doctoral scholarship. D.K.L. is the recipient of a NSERC postgraduate scholarship.

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Facchini, P.J., Hagel, J.M., Liscombe, D.K. et al. Opium poppy: blueprint for an alkaloid factory. Phytochem Rev 6, 97–124 (2007). https://doi.org/10.1007/s11101-006-9042-0

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