A domain of clathrin that forms coats

Area of Science:

• Cell biology
• Molecular biology
• Biochemistry

Background:

• Triskelions are the fundamental assembly units of clathrin coats.
• Clathrin coats are essential for intracellular membrane trafficking.

Purpose of the Study:

• To investigate the role of triskelion outer arms in clathrin coat assembly.
• To determine if clathrin triskelions can assemble into coats after partial proteolysis.

Main Methods:

• Trypsin digestion of purified triskelions.
• In vitro assembly assays to assess coat formation.
• Analysis of digested triskelion components.

Main Results:

• Triskelions with outer arms removed by trypsin digestion retained assembly competence.
• Digested triskelions contained a 110,000 molecular weight clathrin domain.
• Intact light chains were absent in the assembled structures.

Conclusions:

• The outer arms of clathrin triskelions are not essential for coat assembly.
• A core domain of clathrin, lacking intact light chains, is sufficient for forming clathrin coats.
• These findings refine our understanding of clathrin coat structure and assembly mechanisms.