Wheat storage proteins in transgenic rice endosperm

Area of Science:

• Agricultural Biotechnology
• Food Science and Technology
• Molecular Biology

Background:

• Understanding the impact of foreign protein expression in rice endosperm is crucial for developing improved food ingredients.
• Wheat high-molecular-weight glutenin subunits (HMW-GS) are known for their significant contribution to dough viscoelasticity in wheat-based products.

Purpose of the Study:

• To characterize transgenic rice seeds expressing a wheat HMW glutenin subunit (1Dx5).
• To investigate the effects of this wheat prolamin on rice protein expression, size distribution, and dough functional/rheological properties.

Main Methods:

• Generation of transgenic rice expressing wheat HMW-GS.
• Proteomic analysis to compare protein expression patterns between transgenic and wild-type rice.
• Matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF-MS) for molecular size determination.
• Analysis of functional and rheological properties of rice flour and dough.

Main Results:

• Significant differences in protein expression patterns were observed in transgenic rice compared to wild-type.
• Increased levels of protein disulfide isomerase (PDI) were detected in transgenic rice lines.
• Expressed wheat HMW-GS (1Dx5) positively impacted functional properties by increasing polymeric protein size distribution and modifying dough mixing parameters.

Conclusions:

• Expression of wheat HMW-GS in rice alters endosperm protein profiles, including increased PDI.
• The incorporated wheat prolamin enhances the functional properties of rice flour and dough, suggesting potential for improved food applications.