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Bacterial Protein Maturation

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
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Beef carcass electrical stimulation enhances Calpain-1 autolysis but not proteolysis.

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Related Experiment Video

Updated: May 27, 2026

Species Determination and Quantitation in Mixtures Using MRM Mass Spectrometry of Peptides Applied to Meat Authentication
09:26

Species Determination and Quantitation in Mixtures Using MRM Mass Spectrometry of Peptides Applied to Meat Authentication

Published on: September 20, 2016

Muscle proteinases and meat aging.

M Koohmaraie1

  • 1USRA-ARS, Roman L. Hruska US Meat Animal Research Center, P.O. Box 166, Clay Center, Nebraska 68933, USA.

Meat Science
|November 9, 2011
PubMed
Summary

Meat tenderization during refrigerated post mortem storage is primarily driven by proteolysis of myofibrillar proteins. The calpain proteolytic system is key to this process, breaking down structural proteins and improving meat tenderness.

Area of Science:

  • Food Science
  • Biochemistry
  • Muscle Biology

Background:

  • Meat tenderization is a complex process occurring during post mortem storage.
  • Understanding the biochemical mechanisms is crucial for improving meat quality.

Purpose of the Study:

  • To review and summarize experimental findings on the mechanism of meat tenderization.
  • To highlight the role of proteolysis in improving meat tenderness.

Main Methods:

  • Review of laboratory experiments on post mortem meat tenderization.
  • Analysis of proteolysis of key myofibrillar proteins.

Main Results:

  • Proteolysis of myofibrillar proteins is the principal cause of increased meat tenderness.

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  • The calpain proteolytic system is identified as responsible for post mortem proteolysis.
  • Degradation of Z-disks and specific proteins like desmin and titin contribute to myofibril fragility.

    • Conclusions:

    • The calpain system's regulation is critical for post mortem meat tenderization.
    • Proteolysis extent and rate are primary determinants of meat tenderness variation.
    • Further research should focus on understanding calpain system regulation in post mortem muscle.