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The beta-thymosin/WH2 fold: multifunctionality and structure.

Roberto Dominguez¹

¹Department of Physiology, University of Pennsylvania School of Medicine, 3700 Hamilton Walk, Philadelphia, PA 19104, USA. droberto@mail.med.upenn.edu

Annals of the New York Academy of Sciences

|May 1, 2007

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The beta-thymosin/WH2 domain is a small, versatile protein motif crucial for actin cytoskeleton regulation. Its structure dictates diverse functions, from actin monomer sequestration to filament nucleation and elongation.

Area of Science:

Cell Biology
Biochemistry
Structural Biology

Background:

Actin cytoskeleton remodeling is vital for cellular processes.
Actin-binding proteins (ABPs) regulate actin dynamics through conserved motifs.
The beta-thymosin fold and its shorter form, WASP homology domain 2 (WH2), are abundant ABPs.

Purpose of the Study:

To explore the structure-function relationship of the beta-thymosin/WH2 fold.
To illustrate the diverse roles of this domain in actin regulation.

Main Methods:

Review of existing literature and structural data.
Analysis of four key protein examples: thymosin-beta4, WASP-Arp2/3 complex, Ena/VASP, and IRSp53/MIM.

Main Results:

Related Experiment Videos

The beta-thymosin/WH2 domain, despite sequence variability, consistently binds actin.
Specific sequence and modular organization enable distinct functions: sequestration, nucleation, elongation, and scaffolding.
Examples include thymosin-beta4 (sequestration), WASP-Arp2/3, Lmod, spire (nucleation), Ena/VASP (elongation), and IRSp53/MIM (scaffolding).

Conclusions:

The beta-thymosin/WH2 fold is a multifunctional actin-binding motif.
Its structural adaptability underlies diverse roles in regulating the actin cytoskeleton.