Structural basis of Wiskott-Aldrich syndrome causing mutations in the WH1 domain.
Wiskott-Aldrich syndrome (WAS) is an X-linked recessive immunodeficiency disease associated with eczema, hemorrhagic episodes, and recurrent severe infections. The N-terminus of the cytoplasmic WAS protein (WASP) has similarity to WH1 domains, which recognize proline-rich sequences and direct protein localization and formation of multicomponent assemblies. About one-half of the WAS-causing mutations affect the WH1 domain, but this forms only about one-fifth of the length of the protein. To understand the structural and functional effects of WAS-causing mutations within the WH1 domain, the three-dimensional model of the WASP WH1 domain was constructed based on the crystal structures of the Mena and Ev1 EVH1 (WH1) domains. Based on the model, the protein structural effects of the mutations were evaluated and putative ligand-binding regions identified. Mutations in the WASP WH1 domain were found to influence both the function and structure of the WASP. The amino acid substitutions cause general and local structural changes because of steric clashes and changes to the positions of adjacent strands and the fold of the protein. Some mutations alter the electrostatics and interactions with partners and other domains of WASP.
Rong
S B
SB
Institute of Medical Technology, University of Tampere, Finland.
Vihinen
M
M
D000595:Amino Acid Sequence; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment; D014923:Wiskott-Aldrich Syndrome / Q000235:genetics*; D051316:Wiskott-Aldrich Syndrome Protein
D011506:Proteins; C495767:WAS protein, human; D051316:Wiskott-Aldrich Syndrome Protein