Antibody array-based proteome approach reveals proteins involved in grape seed development.

Area of Science:

• Plant Biology
• Proteomics
• Fruit Development

Background:

• Seedless grapes are highly desirable for consumers, driving research into the genetic and molecular mechanisms of seed development.
• Understanding seed formation is crucial for improving fruit crop quality and marketability.

Purpose of the Study:

• To identify novel protein regulators involved in seed development in grapes (Vitis vinifera).
• To establish a high-throughput method for discovering proteins related to seedlessness.
• To explore the potential of identified proteins for breeding seedless fruits.

Main Methods:

• Employed a monoclonal antibody (mAb)-array-based proteomics approach to screen differentially accumulated proteins between seeded and seedless grapes.
• Utilized immunoblotting, mass spectrometry (MS), and immunoprecipitation (IP)-MS for protein identification and validation.
• Constructed an in planta protein-protein interaction (PPI) network to analyze pathway alterations.

Main Results:

• Identified 2,587 differentially accumulated proteins, with 71 validated by MS.
• Established a PPI network revealing altered carbon metabolism and glycolysis pathways.
• Ectopic overexpression of VvDUF642 and VvPAE in tomato reduced seed production and altered fruit ripening characteristics.

Conclusions:

• Developed a high-throughput proteomics strategy for identifying seed development regulators.
• VvDUF642 and VvPAE are identified as key proteins influencing seed formation.
• These proteins represent promising targets for breeding seedless varieties of grapes and other fruits.