Hiload 16 600 superdex 200 size exclusion chromatography

BG505 SOSIP.664 trimers were recombinantly expressed in HEK293T, 293F, or 293S (GnTI-/-) cells, and 2G12-affinity purified^{13 (link),21 (link),27 (link),48 (link)}. The JR-FL SOSIP.664 trimers were produced in 293T cells and PGT145-affinity purified^{49 (link)}. The supernatant was flown over Sepharose resin cross-linked to 2G12 or PGT145 IgG, then washed with 20 mM Tris pH 8, 500 mM NaCl, and eluted with 3M MgCl₂. The eluted trimers were dialyzed into 20 mM Tris pH8, 500 mM NaCl. BG505 SOSIP.664 trimers were further purified through a HiLoad 16/600 Superdex 200 size exclusion chromatography (SEC) column (GE Healthcare) for structural and biophysical studies.
3BC315 and 3BC176 were expressed in HEK293F cells as Fabs or IgGs, where the HC and LC genes were co-transfected at a ratio of 2:1. The IgGs were purified in a single step, through a 5 mL Protein A column (GE Healthcare). Fabs were purified in three steps. First, the harvested media was loaded onto a 5 mL Lambda Select column (GE Healthcare), followed by cation exchange chromatography using a MonoS column (GE Healthcare). Fractions corresponding to the proper HC-LC dimer paring were then SEC-purified through a Superdex 200 column (GE Healthcare).