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Tethering factor P115: a new model for tether-SNARE interactions.

Robert Grabski¹, Jesse Hay², Elizabeth Sztul¹

¹Department of Cell Biology, Developmental and Integrative; University of Alabama at Birmingham; Birmingham, AL USA.

Bioarchitecture

|September 21, 2012

Summary

The membrane tethering factor p115 uses its CC1 and CC4 domains to bind distinct SNARE proteins. This dual interaction is crucial for p115

Keywords:

Golgi SNARE coiled-coil domain p115 tethering

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Area of Science:

Cell Biology
Molecular Biology
Membrane Trafficking

Background:

The p115 protein is a key tethering factor involved in endoplasmic reticulum (ER) to Golgi transport and Golgi biogenesis.
p115's multidomain structure enables interactions with various proteins regulating cargo movement at the ER-Golgi interface.
Previously, only the CC1 domain of p115 was known to be essential for its function, binding SNARE proteins and Rab1.

Purpose of the Study:

To investigate the role of the CC4 coiled-coil domain of p115 in membrane tethering and fusion.
To elucidate the mechanism by which p115 facilitates Golgi homeostasis and cargo trafficking.

Main Methods:

Analysis of p115 protein structure and function, focusing on its coiled-coil domains (CC1-CC4).
Investigating interactions between p115 domains and SNARE proteins.
Assessing the requirement of CC4 for Golgi homeostasis and transmembrane/soluble cargo trafficking.

Main Results:

The C-terminal region of p115 contains four coiled-coil domains (CC1-CC4).
CC4, in addition to CC1, interacts with SNARE proteins and is necessary for p115 function in Golgi homeostasis and transmembrane cargo trafficking.
A novel model is proposed where p115 simultaneously engages CC1 and CC4 with distinct SNARE proteins.

Conclusions:

p115 utilizes both its CC1 and CC4 domains to interact with different SNARE proteins.
This simultaneous engagement promotes SNARE complex formation, facilitating membrane tethering and fusion.
The findings reveal a new mechanism for p115-mediated membrane trafficking and Golgi maintenance.