Recognition of sorting signals by clathrin adaptors

Area of Science:

• Cell biology
• Molecular biology
• Protein trafficking

Background:

• Membrane protein sorting relies on cytosolic coats that form vesicles and concentrate cargo.
• Clathrin coats and adaptor proteins are key players, especially in endocytosis, by clustering receptors with specific motifs.
• Similar sorting signals are involved in lysosomal and basolateral transport, suggesting related coat machinery.

Purpose of the Study:

• To review the recognition mechanisms of sorting signals by clathrin-associated adaptor proteins.
• To highlight recent progress in understanding these protein sorting pathways.
• To focus on the role of adaptor proteins in cargo selection.

Main Methods:

• Literature review focusing on recent methodological and conceptual advances.
• Analysis of known sorting signals (tyrosine and dileucine motifs).
• Discussion of clathrin-associated adaptor protein functions in various cellular compartments.

Main Results:

• Clathrin-associated adaptor proteins recognize specific sorting signals on cargo.
• These adaptor proteins are crucial for cargo clustering and vesicle formation.
• Similar recognition principles apply across different sorting pathways, including endocytosis, lysosomal, and basolateral sorting.

Conclusions:

• Adaptor protein-mediated signal recognition is central to membrane protein sorting.
• Recent advancements have significantly improved our understanding of these molecular mechanisms.
• The clathrin-associated adaptor protein system is a conserved mechanism for cellular trafficking.