International Union of Crystallography, Acta Crystallographica Section F: Structural Biology Communications, 2(74), p. 82-85, 2018
DOI: 10.1107/s2053230x17018544
Full text: Unavailable
The chemokine CCL5 is considered to be a potential therapeutic target because of its ability to recruit immune cells to inflammatory sites. CCL5 aggregates under physiological conditions, and high-order oligomer formation is considered to be significant for cell migration, immune-cell activation and HIV cell entry. The structure of the high-order oligomer is unknown and the mechanism by which the oligomer is derived has yet to be established. Here, a CCL5 mutant (CCL5-E66S) which is deficient in oligomer formation was mixed with native CCL5 to prepare a protein trimer. At an optimized ratio the trimeric CCL5 crystallized, and the crystal belonged to the tetragonal space groupP41212, with unit-cell parametersa= 56.6,b= 56.6,c= 154.1 Å. The Matthews coefficient (VM) of the crystal is 2.58 Å3 Da−1(three molecules in the asymmetric unit), with a solvent content of 52.32%. Diffraction data were collected to a resolution of 1.87 Å and the statistics indicated satisfactory data quality. The new structure will reveal the interfaces in the CCL5 oligomer, therefore assisting in understanding the mechanism of CCL5 oligomerization.