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Membrane-SPINE: A Biochemical Tool to Identify Protein-protein Interactions of Membrane Proteins In Vivo

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A zyxin head-tail interaction regulates zyxin-VASP complex formation.

James D Moody¹, Jacob Grange, Marc P A Ascione

¹Physiology and Developmental Biology, Brigham Young University, 574 WIDB, Provo, UT 84602, USA.

Biochemical and Biophysical Research Communications

|December 9, 2008

Summary

Zyxin

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Area of Science:

Cell biology
Biochemistry
Molecular dynamics

Background:

Zyxin is an adhesion protein crucial for regulating actin assembly.
Its N-terminal proline-rich motifs bind to VASP family members.
The C-terminal LIM domains of zyxin are suggested to negatively regulate zyxin-VASP complexes.

Purpose of the Study:

To elucidate the mechanism by which zyxin's LIM domains regulate zyxin-VASP complex assembly.
To investigate the role of intramolecular interactions in controlling zyxin function.

Main Methods:

Biochemical assays to study protein-protein interactions.
Analysis of zyxin-VASP complex formation under different phosphorylation states.

Main Results:

Zyxin's LIM domains directly associate with zyxin's VASP-binding sites.
This association prevents zyxin from binding to PKA-phosphorylated VASP.
Unphosphorylated VASP can overcome this intramolecular inhibition through direct LIM domain interaction.

Conclusions:

Zyxin regulates its interaction with VASP family members via an intramolecular head-tail mechanism.
The LIM domains act as a gatekeeper, controlling access to VASP binding sites.
Zyxin's activity, similar to other actin regulators, is modulated by intramolecular interactions.