A recombinant protein of two high molecular weight glutenins alters gluten polymer formation in transgenic wheat.

The Journal of Biological Chemistry
Y ShimoniG Galili

Abstract

Wheat high molecular weight glutenin subunits (HMW-GS) are the most important determinants of its superiority for making leavened bread. Following synthesis, these proteins are sequestered into the endoplasmic reticulum and assemble into extremely large elastic polymers, linked by noncovalent and intermolecular disulfide bonds. To study the structural requirements for the assembly of HMW-GS, we have expressed in transgenic wheat a recombinant protein between two cognate x- and y-type subunits. In contrast to the natural polymerized x- and y-type HMW-GS, a significant amount of the recombinant subunit remained monomeric. Nonreducing SDS-polyacrylamide gel electrophoresis, coupled with limited proteolysis, showed that the monomeric form of the recombinant subunit contained an unusual intramolecular disulfide bond, linking an N-terminal cysteine to the single C-terminal cysteine residue. In addition, sucrose gradient analysis revealed that this intramolecular disulfide bond impeded the ability of the recombinant subunit to assemble into polymers. Despite of its altered assembly, a notable amount of the overexpressed recombinant subunit was also present in glutenin polymers. Moreover, its presence significantly altered the subunit ...Continue Reading

References

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Citations

Mar 5, 2011·Plant Cell Reports·Amélie SaumonneauMathilde Francin-Allami
Mar 6, 1999·Current Opinion in Plant Biology·T KomariT Kubo
Mar 6, 1999·Current Opinion in Plant Biology·K Matsuoka, S Y Bednarek
Dec 21, 2002·Protein Science : a Publication of the Protein Society·Roland CazalisJean-François Gibrat
Feb 23, 2012·Plant Biotechnology Journal·Tejinder KumarTom Clemente

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