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Intermolecular disulfide bonds link specific high-molecular-weight glutenin subunits in wheat endosperm
H P Tao1, A E Adalsteins, D D Kasarda
1Western Regional Research Center, U.S. Department of Agriculture, Albany, CA 94710.
Biochimica Et Biophysica Acta
|September 4, 1992
Summary
Researchers investigated insoluble glutenin aggregates in wheat flour. They discovered specific peptide fragments linked by disulfide bonds, revealing a defined orientation in glutenin structures.
Area of Science:
- Biochemistry
- Food Science
- Proteomics
Background:
- Wheat flour contains soluble proteins and insoluble glutenin aggregates.
- Glutenin aggregates are crucial for dough elasticity and bread quality.
- Understanding glutenin structure is key to improving wheat-based products.
Purpose of the Study:
- To characterize the structure of insoluble glutenin aggregates.
- To identify specific peptide fragments and their linkages within glutenin.
- To elucidate the role of intermolecular disulfide bonds in glutenin assembly.
Main Methods:
- Soluble proteins were extracted from wheat flour using a detergent wash.
- The remaining insoluble glutenin aggregates were digested with endoproteinase Lys-C.
- Peptides were isolated and analyzed using N-terminal sequencing and molecular weight determination.
Main Results:
- Endoproteinase Lys-C digestion yielded peptides resembling intact high-molecular-weight glutenin subunits.
- Isolated peptides were confirmed to be fragments of glutenin subunits linked by intermolecular disulfide bonds.
- Specific peptides contained both x-type and y-type glutenin subunit components, indicating directed assembly.
Conclusions:
- Intermolecular disulfide bonds play a specific role in linking glutenin subunits.
- The identified peptide structures suggest a defined orientation within glutenin aggregates.
- This structural insight can inform strategies for modifying gluten properties in wheat breeding and food processing.