Proteomic analyses of mitochondrial damage in postmortem beef muscles

Area of Science:

• Proteomics
• Mitochondrial Biology
• Meat Science

Background:

• Mitochondria play a crucial role in cellular processes.
• Understanding mitochondrial changes postmortem is key to meat quality.
• Tenderization mechanisms are not fully elucidated.

Purpose of the Study:

• To investigate mitochondrial protein expression profiles at death and 24 hours postmortem.
• To identify mitochondrial mechanisms associated with beef tenderization.
• To characterize the role of mitochondrial damage in postmortem changes.

Main Methods:

• Tandem Mass Tag (TMT) quantitative proteomics approach.
• Analysis of mitochondrial protein expression at two postmortem time points.
• Bioinformatic analysis of differentially expressed proteins.

Main Results:

• Significant mitochondrial damage observed in tender meat at 24 hours postmortem.
• 456 mitochondrial proteins identified, with 442 down-regulated and 14 up-regulated.
• Key proteins involved in oxidative phosphorylation, MPTP damage, mitochondrial morphology, and apoptosis were identified.

Conclusions:

• Mitochondrial damage is a potential indicator of beef tenderness.
• Mitochondrial damage influences postmortem tenderization through energy metabolism and apoptosis.
• Specific mitochondrial proteins are validated as regulators of tenderness.