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| PROSITE documentation PDOC51082 |
The WH2 (WASP-Homology 2, or Wiskott-Aldrich homology 2) domain is an ~18 amino acids actin-binding motif. This domain was first recognized as an essential element for the regulation of the cytoskeleton by the mammalian Wiskott-Aldrich syndrome protein (WASP) family. WH2 proteins occur in eukaryotes from yeast to mammals, in insect viruses, and in some bacteria. The WH2 domain is found as a modular part of larger proteins; it can be associated with the WH1 or EVH1 domain (see <PDOC50229>) and with the CRIB domain (see <PDOC50108>), and the WH2 domain can occur as a tandem repeat. The WH2 domain binds actin monomers and can facilitate the assembly of actin monomers into newly forming actin filaments [1,2,3,4].
Some proteins known to contain a WH2 domain:
- Mammalian Wiskott-Aldrich syndrome protein (WASP), a possible regulator of lymphocyte and platelet function. Defects in WASP are the cause of Wiskott- Aldrich syndrome (WAS), an X-linked recessive disease characterized by immune dysregulation and microthrombocytopenia. WASP proteins bind the actin nucleating protein complex Arp2/3.
- Mammalian N-WASP/WASL and WASF/SCAR/WAVE1-3, and yeast LAS17, which are also proteins from the WASP family that participate in the transduction of signals from the cell surface to the actin cytoskeleton.
- Baker's yeast Verprolin, a protein involved in cytoskeletal organization and cellular growth.
- Human WASP interacting protein (WASPIP/WIP), a WASP-, profilin- and actin-binding protein which induces actin polymerization and redistribution.
- Nuclear polyhedrosis virus (NPV) P61/78/83 capsid protein, which may be important for the persistence and survival of the virus.
- Fruit fly Spir(e) protein, an actin nucleation factor involved in the development of oocytes and embryos. Spir is conserved among metazoans.
- Mammalian metastasis suppressor 1 or Missing in Metastasis (MIM) protein, an actin-binding protein that may be related to cancer progression or tumor metastasis.
The profile we developed covers the entire WH2 domain.
Last update:February 2005 / First entry.
PROSITE method (with tools and information) covered by this documentation:
| 1 | Authors | Machesky L.M., Insall R.H., Volkman L.E. |
| Title | WASP homology sequences in baculoviruses. | |
| Source | Trends Cell Biol. 11:286-287(2001). | |
| PubMed ID | 11434350 |
| 2 | Authors | Edwards J. |
| Title | Are beta-thymosins WH2 domains? | |
| Source | FEBS Lett. 573:231-232(2004). | |
| PubMed ID | 15328003 | |
| DOI | 10.1016/j.febslet.2004.07.038 |
| 3 | Authors | Paunola E., Mattila P.K., Lappalainen P. |
| Title | WH2 domain: a small, versatile adapter for actin monomers. | |
| Source | FEBS Lett. 513:92-97(2002). | |
| PubMed ID | 11911886 |
| 4 | Authors | Quinlan M.E., Heuser J.E., Kerkhoff E., Mullins R.D. |
| Title | Drosophila Spire is an actin nucleation factor. | |
| Source | Nature 433:382-388(2005). | |
| PubMed ID | 15674283 | |
| DOI | 10.1038/nature03241 |
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