The twin-arginine protein translocation pathway

Area of Science:

• Biochemistry
• Molecular Biology
• Cellular Biology

Background:

• The twin-arginine translocation (Tat) system facilitates the transport of folded proteins across biological membranes in various organisms.
• A key mechanistic question involves how the Tat system achieves protein transport without causing significant ion leakage.
• Tat transport relies on protein complexes composed of small integral membrane proteins from two distinct families.

Purpose of the Study:

• To review the current understanding of the twin-arginine translocation (Tat) system's mechanism.
• To integrate recent atomic-resolution structural data into the mechanistic model of Tat transport.
• To elucidate how the Tat machinery facilitates folded protein translocation across membranes.

Main Methods:

• Review of existing literature on the twin-arginine translocation (Tat) system.
• Analysis of recently determined atomic-resolution structures of key Tat protein families.
• Integration of structural insights with functional and mechanistic data.

Main Results:

• Recent atomic-resolution structures provide the first molecular-level view of the Tat machinery.
• These structures illuminate the components involved in Tat-mediated protein transport.
• The data offer new perspectives on how the Tat system operates.

Conclusions:

• The newly available structural data are crucial for understanding the Tat transport mechanism.
• Insights into the Tat machinery's structure advance our knowledge of protein translocation.
• Further research can build upon these structural findings to fully elucidate Tat function.