Palmitoylation of membrane proteins (Review)

Area of Science:

• Biochemistry
• Cell Biology
• Molecular Biology

Background:

• S-palmitoylation is a reversible post-translational modification involving the addition of a fatty acyl chain to cysteine residues.
• While its role in soluble proteins is understood, its impact on transmembrane proteins is less clear.
• This modification is mediated by Palmitoyl-acyl Transferases and reversed by Protein Palmitoyl Thioesterases.

Purpose of the Study:

• To review the diverse consequences of S-palmitoylation on membrane proteins.
• To explore the underlying mechanisms driving these palmitoylation-induced changes.
• To highlight the current limitations in predicting these effects.

Main Methods:

• Literature review of studies on S-palmitoylation in membrane proteins.
• Analysis of reported effects on protein folding, localization, assembly, signaling, and trafficking.
• Discussion of proposed molecular mechanisms.

Main Results:

• Palmitoylation of transmembrane proteins can lead to improper folding, ER retention, Golgi retention, impaired assembly, altered signaling, and endocytic pathway mis-sorting.
• Mechanisms include controlling transmembrane segment conformation, altering membrane domain affinity, and modulating protein-protein interactions.

Conclusions:

• S-palmitoylation significantly impacts transmembrane protein behavior in complex ways.
• Further research is needed to fully elucidate and predict these effects due to limited data.
• Understanding these modifications is key to deciphering membrane protein function.