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(Last modification: 22. October 2010)
Resveratrol Synthesis
in Transgenic Plants and other Organisms
Setup of page
Note: the References plus Abstracts
are in a separate page: click here
for direct access.
Link to
some interesting reviews
(new 22.10.2010)
Transgenic Plants
If you are really keen on resveratrol, but shy away from taking it in pill form: at least theoretically, you could get
it with your daily food. A large number of plants have been genetically
engineered to synthesize resveratrol: by introduction and expression of a
resveratrol synthase gene. I am not sure, however, whether any of these plants
is already used in agriculture. It certainly is difficult to be imagined in Germany, with
its wide-spread animosity against transgenic plants.
Looking at the publications, it becomes
obvious that supplementation of foods with resveratrol was originally not the
primary purpose: the early work was not aware of that aspect; it
rather investigated whether transgenic stilbenes in their role as phytoalexins
would increase resistance against fungal and/or bacterial infections.
A good recent review, however a bit too
much focussed on grapevine and its STS:
Delaunois et al. (2009).
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Plant
(with links to Wikipedia) |
References and short
comments
|
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Arabidopsis thaliana
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Yu et al., 2006;
-> why Arabidopsis? The only justification seems to be that this tested
the first STS from a monocot:
Sorghum bicolor. |
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Alfalfa
(Medicago sativa)
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Hipskind et al.,
2000;
-> intended as phytoalexin: but resveratrol should have the same
beneficial
effects in cattle as in humans? |
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Apple
(Malus domestica)
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Szankowski
et al., 2003; Rühmann
et al., 2006;
-> for apples as sources of resveratrol |
|
Grape
(Vitis vinifera)
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Fan et al., 2008;
Coutos-Thévenot et al., 2001;
-> for disease resistance (role as phytoalexin) |
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Hop
(Humulus lupulus)
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Schwekendiek
et al., 2007;
->
According to the authors, "sts transgenic hop plants could display
enhanced pathogen resistance against microbial pathogens, exhibit new
beneficial properties for health, and open new venues for metabolic
engineering": how about bringing via these plants resveratrol into beer?
-> Actually, hop cones appear to contain resveratrol (most in the
form of piceid, the sucrose derivative) anyway:
Callemien et
al., 2005;
Jerkovic et al., 2005;
Jerkovic and
Collin, 2007;
Jerkovic and
Collin, 2008. |
|
Kiwi
(Actinidia
deliciosa)
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Kobayashi
et al., 2000;
-> apparently no effect on disease resistance, but the resveratrol in
the fruits might have beneficial effects on humans |
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Lettuce
(Lactuca sativa)
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Liu
et al., 2006;
-> food supplementation with resveratrol ! |
|
Monocots
-
Barley
(Hordeum vulgare)
-
Rice (Oryza
sativa)
-
Wheat
(Triticum spp.)
|
-> apparently for
phytoalexin formation: are there recent attempts to get resveratrol into the
seeds?
Leckband and Lörz, 1998;
Stark-Lorenzen
et al., 1997;
Tian et al., 1998,
Leckband and Lörz, 1998;
Fettig and Hess, 1999;Liang et al., 2000;
Serazetdinova
et al., 2005;
|
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Papaya
(Carica papaya)
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Zhu
et al., 2004;
-> disease resistance |
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Peas
(Pisum sativum)
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Richter
et al., 2006;
-> disease resistance |
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Rapeseed
(Brassica napus L.)
|
Hüsken et al.,
2005;
-> supplementation of the seeds with resveratrol ! |
|
Strawberry
(Fragraria)
|
Hanhineva
et al., 2009
-> no stilbenes detected, although changes in
metabolite profile |
|
Monterey Pine
= Radiata pine (Pinus
radiata)
|
Höfig et al., 2006;
-> interesting approach to genetically engineered nuclear male sterility!
|
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Rehmannia glutinosa
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Lim et al., 2005;
-> this medicinal plant contains traces of resveratrol type compounds:
the STS from peanut was used to increase resveratrol amounts |
|
Tobacco
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Hain et al.,
1990;
1993;
Fischer et al.,
1997; Zhong et
al., 2004;
Schmidlin et
al., 2008;
-> pathogen resistance (who would eat tobacco?
However, there are also tobacco chewers).
-> Fischer et al.: Effect of resveratrol on male sterility!
|
|
Tomato
(Lycopersicon esculentum)
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Thomzik et al., 1997;
Giovinazzo et al., 2005;
Morelli et al., 2006;
Schijlen et al.,
2006;
Nicoletti et
al., 2007;
D'Introno et al., 2009;
Ma et al., 2009;
->These seem to be the most advanced experiments to genetically engineer
resveratrol biosynthesis specifically into fruits!
->
Interestingly, one publication even claimed that resveratrol glucoside
(piceid) is present
in normal tomato, but only in the skin of the fruit, not in the flesh (Ragab
et al., 2006),
|
|
White poplar (Populus
alba)
and
Aspen (Populus
tremula)
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Giorcelli et al., 2004;
-> much resveratrol-glycoside, but no increased resistance against rust
disease
Seppänen et
al., 2004;
-> resistance against fungi |
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Other Organisms
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Human cell cultures
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Zhang et al.,
2006
-> recent work shows that the pathway
from the amino acids phenylalanine/tyrosine to resveratrol can be transferred by
genetic manipulation to human cell cultures. No precursor feeding was
necessary to obtain resveratrol in the cells !!! |
|
Yeast
(e.g. Saccharomyces cerevisiae)
|
Gonzalez-Candelas et al., 2000;
Becker et al., 2003,
Beekwilder
et al., 2006,
Zhang et al., 2006;
Trantas et al.,
2009;
->The expression of the pathway from phenylalanine to resveratrol also
works with yeasts:
The interesting aspect in this is that using such strains in
beer or wine fermentation could introduce resveratrol into beer and
white wine !!!
|
Streptomyces venezuelae
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Park et al., 2009
-> The first publication with expression in Streptomycetes |
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E. coli
|
Watts et al., 2006;
Beekwilder et al., 2006;
Katsuyama et al., 2007a;
Katsuyama et al., 2007b;
Horinouchi 2009;
->
And how about E. coli? These bacteria were not only used to get
recombinant chalcone and stilbene synthases (for functional investigations in
vitro), but they can also be engineered to
produce stilbenes in vivo: Would it not be a hilarious idea to
have such a supplement in your
intestinal flora? |
Link to some
reviews
Return to Resveratrol
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A few comments
-
"Functional
food"
While looking up the literature on transgenic plants synthesizing
resveratrol, one cannot avoid this term that seems a bit confusing at first. Usually, there is an opposite term for a
given property, like functional versus non-functional machinery. What might
be the opposite of functional food? Non-functional food? And what might that
mean? I always thought that food is by definition functional, as
nourishment.
Wikipedia provides some definition:
-
Functional food or medicinal food is any fresh or processed
food claimed to have a health-promoting or disease-preventing property
beyond the basic function of supplying nutrients. The general category of
functional foods includes processed food or foods fortified with
health-promoting additives, like "vitamin-enriched" products. Fermented
foods with live cultures are considered as functional foods with probiotic
benefits".
- Transgenic plants with resveratrol would certainly be considered as "functional
food", but would they qualify as "organic" food?
-
"Organic Food"
(deutsch: "Bio-Lebensmittel")
Rather similar problems come up with this term: what is the
opposite? The meaning obviously has nothing to do with the standard meaning
of 'organic'
in science. According to Wikipedia, "organic
certification" is a rather complex topic. One point, however, seems to
be clear:
- "In most countries, organic produce may not be genetically
modified".
- Therefore, forget about "functional food" with healthy resveratrol introduced by
addition of genes: it will never qualify as "organic food".
- However, there may be ways to bypass this in some cases. Examples (there
may be more that I am not aware of at present):
-
Sorghum bicolor
does contain a stilbene synthase gene (SbSTS1) which is most
likely involved in pathogen resistance (Yu
et al., 2005), and the function in resveratrol biosynthesis was
demonstrated by transgenic expression in A. thaliana (see Table above).
Why should it not be possible, with the sophisticated methods of modern
plant breeding, to obtain gene expression in the seeds? That would be "functional"
without genetic modification , i.e. it would be "organic".
- Bananas (Musa
cavendish) contain resveratrol dimers (Hölscher
et al., 1996). Apparently so far they were only found in rhizomes, but
would it be possible by classical plant breeding techniques to obtain gene
expression in fruits? Again, as above: That would be "functional" without
genetic modification , i.e. it would be "organic".
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