Download MendeleyStructural characterization of the MIT domain from human Vps4b
Takasu, H., Jee, J.G., Ohno, A., Goda, N., Fujiwara, K., Tochio, H., Shirakawa, M., Hiroaki, H.(2005) Biochem Biophys Res Commun 334: 460-465
- PubMed: 16018968
- DOI: https://doi.org/10.1016/j.bbrc.2005.06.110
- Primary Citation of Related Structures:
1WR0 - PubMed Abstract:
The microtubule interacting and trafficking (MIT) domain is a small protein module of unknown function that is conserved in proteins of diverse function, such as Vps4, sorting nexin 15 (SNX15), and spastin. One non-synonymous single nucleotide polymorphism was reported, which results in a Ile58-to-Met (I58M) substitution in hVps4b. Here, we have determined the solution structure of the MIT domain isolated from the NH(2)-terminus of human Vps4b, an AAA-ATPase involved in multivesicular body formation. The MIT domain adopts an 'up-and-down' three-helix bundle. Comparison with the sequences of other MIT domains clearly shows that the residues involved in inter-helical contacts are well conserved. The Ile58-to-Met substitution resulted a substantial thermal instability. In addition, we found a shallow crevice between helices A and C that may serve as a protein-binding site. We propose that the MIT domain serves as a putative adaptor domain for the ESCRT-III complex involved in endosomal trafficking.
Organizational Affiliation:
International Graduate School of Arts and Sciences, Yokohama City University, Yokohama, Kanagawa 230 0045, Japan.
