Structural changes of proteins in liver cirrhosis and consequential changes in their function.

Area of Science:

• Biochemistry
• Molecular Biology
• Hepatology

Background:

• The liver synthesizes most circulating proteins, requiring extensive posttranslational modifications (PTMs) for proper function.
• PTMs involve adding or removing molecular groups, tailoring proteins for specific physiological roles.
• Aberrant PTMs can arise in pathological conditions, leading to altered protein structure and function.

Purpose of the Study:

• To review posttranslational modifications (PTMs) affected in cirrhosis.
• To highlight PTMs with significant functional consequences in liver disease.
• To explore the potential of altered PTMs as biomarkers for cirrhosis.

Main Methods:

• Literature review focusing on PTMs in liver disease.
• Analysis of specific PTMs including oxidation, nitration, glycosylation, acetylation, and ubiquitination.
• Discussion of PTMs affecting intracellular and extracellular proteins in cirrhosis.

Main Results:

• Cirrhosis is associated with specific PTMs like oxidation, nitration, glycosylation, acetylation, and ubiquitination.
• These modifications can affect proteins retained in hepatocytes or secreted into circulation.
• Altered PTMs in cirrhosis can lead to significant functional consequences for affected proteins.

Conclusions:

• PTMs play a critical role in protein function and quality control within the liver.
• Specific PTMs are altered in cirrhosis, impacting protein structure and function.
• Investigating these altered PTMs may yield valuable biomarkers for diagnosing and managing liver cirrhosis.