Structural highlights
Function
[STAM2_HUMAN] Involved in intracellular signal transduction mediated by cytokines and growth factors. Upon IL-2 and GM-CSL stimulation, it plays a role in signaling leading to DNA synthesis and MYC induction. May also play a role in T-cell development. Involved in down-regulation of receptor tyrosine kinase via multivesicular body (MVBs) when complexed with HGS (ESCRT-0 complex). The ESCRT-0 complex binds ubiquitin and acts as sorting machinery that recognizes ubiquitinated receptors and transfers them to further sequential lysosomal sorting/trafficking processes (By similarity).
Publication Abstract from PubMed
The VHS domain of the Stam2 protein is a ubiquitin binding domain involved in the recognition of ubiquitinated proteins committed to lysosomal degradation. Among all VHS domains, the VHS domain of Stam proteins is the strongest binder to monoubiqiuitin and exhibits preferences for K63-linked chains. In the present paper, we report the solution NMR structure of the Stam2-VHS domain in complex with monoubiquitin by means of chemical shift perturbations, spin relaxation, and paramagnetic relaxation enhancements. We also characterize the interaction of Stam2-VHS with K48- and K63-linked diubiquitin chains and report the first evidence that VHS binds differently to these two chains. Our data reveal that VHS enters the hydrophobic pocket of K48-linked diubiquitin and binds the two ubiquitin subunits with different affinities. In contrast, VHS interacts with K63-linked diubiquitin in a mode similar to its interaction with monoubiquitin. We also suggest possible structural models for both K48- and K63-linked diubiquitin in interaction with VHS. Our results, which demonstrate a different mode of binding of VHS for K48- and K63-linked diubiquitin, may explain the preference of VHS for K63- over K48-linked diubiquitin chains and monoubiquitin.
NMR Reveals a Different Mode of Binding of the Stam2 VHS Domain to Ubiquitin and Diubiquitin .,Lange A, Hoeller D, Wienk H, Marcillat O, Lancelin JM, Walker O Biochemistry. 2010 Dec 13. PMID:21121635[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Lange A, Hoeller D, Wienk H, Marcillat O, Lancelin JM, Walker O. NMR Reveals a Different Mode of Binding of the Stam2 VHS Domain to Ubiquitin and Diubiquitin . Biochemistry. 2010 Dec 13. PMID:21121635 doi:10.1021/bi101594a
