Download MendeleySame structure, different function crystal structure of the Epstein-Barr virus IL-10 bound to the soluble IL-10R1 chain.
Yoon, S.I., Jones, B.C., Logsdon, N.J., Walter, M.R.(2005) Structure 13: 551-564
- PubMed: 15837194 Search on PubMed
- DOI: https://doi.org/10.1016/j.str.2005.01.016
- Primary Citation Related Structures:
1Y6K, 1Y6M, 1Y6N - PubMed Abstract:
Human IL-10 (hIL-10) is a cytokine that modulates diverse immune responses. The Epstein-Barr virus (EBV) genome contains an IL-10 homolog (vIL-10) that shares high sequence and structural similarity with hIL-10. Although vIL-10 suppresses inflammatory responses like hIL-10, it cannot activate many other immunostimulatory functions performed by the cellular cytokine. These functional differences have been correlated with the approximately 1000-fold lower affinity of vIL-10, compared to hIL-10, for the IL-10R1 receptor chain. To define the structural basis for these observations, crystal structures of vIL-10 and a vIL-10 point mutant were determined bound to the soluble IL-10R1 receptor fragment (sIL-10R1) at 2.8 and 2.7 A resolution, respectively. The structures reveal that subtle changes in the conformation and dynamics of the vIL-10 AB and CD loops and an orientation change of vIL-10 on sIL-10R1 are the main factors responsible for vIL-10's reduced affinity for sIL-10R1 and its distinct biological profile.
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.
Organizational Affiliation:
