PMID: 26057800

Authors:

Krumm B, Meng X, Xiang Y, Deng J

Title:

Crystallization of interleukin-18 for structure-based inhibitor design.

Journal:

Acta Crystallogr F Struct Biol Commun. 2015 Jun 1;71(Pt 6):710-7. doi:, 10.1107/S2053230X15006871. Epub 2015 May 20.

Abstract:

Interleukin-18 (IL-18) is a pleiotropic pro-inflammatory cytokine belonging to the IL-1 superfamily. IL-18 plays an important role in host innate and acquired immune defense, with its activity being modulated in vivo by its naturally occurring antagonist IL-18 binding protein (IL-18BP). Recent crystal structures of human IL-18 (hIL-18) in complex with its antagonist or cognate receptor(s) have revealed a conserved binding interface on hIL-18 representing a promising drug target. An important step in this process is obtaining crystals of apo hIL-18 or hIL-18 in complex with small-molecule inhibitors, preferably under low ionic strength conditions. In this study, surface-entropy reduction (SER) and rational protein design were employed to facilitate the crystallization of hIL-18. The results provide an excellent platform for structure-based drug design.