Expression, purification and crystallization of CTB-MPR, a candidate mucosal vaccine component against HIV-1

Lee, H.-H.; Cherni, I.; Yu, H.; Fromme, R.; Doran, J.D.; Grotjohann, I.; Mittman, M.; Basu, S.; Deb, A.; Dörner, K.; Aquila, A.; Barty, A.; Boutet, S.; Chapman, H.N.; Doak, R.B.; Hunter, M.S.; James, D.; Kirian, R.A.; Kupitz, C.; Lawrence, R.M.; Liu, H.; Nass, K.; Schlichting, I.; Schmidt, K.E.; Seibert, M.M.; Shoeman, R.L.; Spence, J.C.H.; Stellato, F.; Weierstall, U.; Williams, G.J.; Yoon, C.; Wang, D.; Zatsepin, N.A.; Hogue, B.G.; Matoba, N.; Fromme, P.; Mor, T.S.

doi:10.1107/S2052252514014900

Figure 3
The CTB^GPGPMPR structure reveals the expected pentameric ring arrangement typical of wild-type CTB but not the structure of the MPR. Cartoon representation of the crystal structure of CTB^GPGPMPR in two orientations: (a) top view, (b) side view. Each subunit is indicated by a different color. The C-terminus of one of the subunits is indicated in red. This region is shown in close-up in (c). (c) 2F_o − F_c electron-density map at a contour level of 1.5σ of the C-terminus of CTB in CTB^GPGPMPR, which was phased with the pentameric CTB model (PDB entry 1jr0 ; Pickens et al., 2002