= SGC clone accession =
= Tag =
= Construct comments =
= Construct sequence =
DNA sequence has been verified by sequencing
= Vector =
= Expression host =
= Growth method =
The recombinant donor vector pFBOH-MHL: CORO6 was transformed into DH10Bac E. coli cells (Invitrogen) to generate recombinant viral DNA.
Sf9 cells (Invitrogen) were transfected with Bacmid DNA using jetPRIME® transfection reagent (PolyPlus Transfection), and recombinant baculovirus particles were recovered.
The recombinant virus sequentially amplified from P1 to P3 viral stocks. Sf9 cells grown in I-Max Insect medium (Wisent Biocenter, Cat.# 301-045-LL) to a density of 4mln/mL and with viability not less than 97% were infected with 10 mL of P3 viral stock for each 1 L of cell culture.
Cultured cells were collected when cell viability dropped to 75-80%, normally after 4 days of post-infection time
= Extraction buffers =
20 mM Tris [pH 8.0], 500 mM NaCl with 5% glycerol
= Extraction procedure =
Native cell pellet was resuspended in extraction buffer and the cells disrupted by sonication for
10 mins at 5" on 10" off duty cycle at 90W output power.
= Purification buffers =
loading buffer: 20 mM Tris [pH 8.0], 500 mM NaCl with 5% glycerol
Washing Buffer: 20 mM Tris [pH 8.0], 500 mM NaCl with 5% glycerol, 5 mM imidazole
Elution Buffer: 20 mM Tris [pH 8.0], 500 mM NaCl with 5% glycerol, 250 mM imidazole
= Purification procedure =
The crude extract was cleared by centrifugation. The lysate was loaded onto (1ml/L) Talon Metal Affinity Resin (Cat# 635504 Clontech).
The resin was washed with 50 CV of loading buffer (20mM Tris [pH 8.0], 500 mM NaCl with 5% glycerol) and 5 CV loading buffer with 5mM imidazole.
The protein was eluted with elution buffer (loading buffer with 250 imidazole). The protein was further purified by Superdex200 (GE Healthcare) using 20 mM Tris [pH 7.5], 300 mM NaCl.
= Protein stock concentration =
Concentration used for crystallization : 8.1 mg/mL
= Mass spec =
= Functional multimerization =
= Crystallization =
Crystallization of CORO6 was performed in 96 well vapor diffusion sitting drop plates by mixing equal volumes of protein and reservoir solution at 20°C.
Diffracting quality crystals were grown in 30% (w/v) PEG 550 MME, 0.05 M Magnesium Chloride and 0.1 M Hepes [pH 7.4].
Crystals were cryoprotected in reservoir solution supplemented with 10% Glycerol and cryo-cooled in liquid nitrogen.