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Evidence for CALM in directing VAMP2 trafficking.

Asaff Harel¹, Fangbai Wu, Mark P Mattson

¹Laboratory of Neurosciences, National Institute on Aging Intramural Research Program, Baltimore, MD 21224, USA.

Traffic (Copenhagen, Denmark)

|January 10, 2008

Summary

Clathrin assembly lymphoid myeloid leukemia protein (CALM) facilitates synaptic vesicle endocytosis. CALM

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Area of Science:

Neurobiology
Cell Biology
Protein Dynamics

Background:

Clathrin assembly lymphoid myeloid leukemia protein (CALM) shares structural similarity with neuron-specific protein AP180.
CALM is known to be expressed in neurons and localized to synapses.

Purpose of the Study:

To investigate the function of CALM in neuronal endocytosis.
To determine CALM's role in the trafficking of synaptic vesicle protein VAMP2.

Main Methods:

Utilizing overexpression and RNA interference (RNAi) techniques to modulate CALM levels.
Analyzing the cell surface levels of VAMP2 in response to CALM manipulation.
Investigating the role of the AP180 N-terminal homology (ANTH) domain of CALM.

Main Results:

Overexpression of CALM reduced cell surface VAMP2 levels.
CALM knockdown via RNAi led to an accumulation of VAMP2 on the cell surface.
The ANTH domain of CALM was essential for its effect on VAMP2 trafficking and acted as a dominant-negative mutant.

Conclusions:

CALM plays a crucial role in facilitating the endocytosis of VAMP2 from the plasma membrane.
The ANTH domain of CALM is critical for its function in VAMP2 trafficking during endocytosis.