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Vernonia DGATs can complement the disrupted oil and protein metabolism in epoxygenase-expressing soybean seeds

Paper ID Volume ID Publish Year Pages File Format Full-Text
31626 44825 2012 10 PDF Available
Title
Vernonia DGATs can complement the disrupted oil and protein metabolism in epoxygenase-expressing soybean seeds
Abstract

Plant oils can be useful chemical feedstocks such as a source of epoxy fatty acids. High seed-specific expression of a Stokesia laevis epoxygenase (SlEPX) in soybeans only results in 3–7% epoxide levels. SlEPX-transgenic soybean seeds also exhibited other phenotypic alterations, such as altered seed fatty acid profiles, reduced oil accumulation, and variable protein levels. SlEPX-transgenic seeds showed a 2–5% reduction in total oil content and protein levels of 30.9–51.4%. To address these pleiotrophic effects of SlEPX expression on other traits, transgenic soybeans were developed to co-express SlEPX and DGAT (diacylglycerol acyltransferase) genes (VgDGAT1 & 2) isolated from Vernonia galamensis, a high accumulator of epoxy fatty acids. These side effects of SlEPX expression were largely overcome in the DGAT co-expressing soybeans. Total oil and protein contents were restored to the levels in non-transgenic soybeans, indicating that both VgDGAT1 and VgDGAT2 could complement the disrupted phenotypes caused by over-expression of an epoxygenase in soybean seeds.

► Expression of a Stokesia laevis epoxygenase (SlEPX) in soybeans achieves 3–7% epoxide levels. ► SlEPX-transgenic seeds showed a 2–5% reduction in oil and protein levels of 30.9–51.4%. ► These side effects were overcome with Vernonia galamensis DGAT1 and 2 coexpression. ► DGAT1 and 2 restored oil and protein contents to normal levels. ► DGAT1 and 2, especially 2 greatly increase epoxide accumulation in the oil.

Keywords
DGAT, diacylglycerol acyltransferase; EPX, epoxygenase; TAG, triacylglycerol; TLC, thin layer chromatography; UFA, unusual fatty acid; Va, vernolic acidAcyltransferase; Epoxide; Glycine max; Seed development; Triacylglycerol
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Vernonia DGATs can complement the disrupted oil and protein metabolism in epoxygenase-expressing soybean seeds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Metabolic Engineering - Volume 14, Issue 1, January 2012, Pages 29–38
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us