| X-RAY DIFFRACTION |
5.2 |
? |
PROTEIN WAS CRYSTALLIZED BY HANGING-DROP VAPOR DIFFUSION AGAINST RESERVOIRS OF 1.0 M NH4(SO4)2, 20 MM NA-CITRATE (PH 5.2), 200 MM NACL, STARTING WITH 6 MICROLITERS OF PROTEIN AT 2 MG/ML IN 20 MM NA-CITRATE (PH 5.2), 200 MM NACL, 5 MM DTT, AND 4 MICROLITERS RESERVOIR SOLUTION. THESE DROPS OF MUTANT PROTEIN WERE STREAK-SEEDED FROM STOCKS GENERATED FROM CRUSHED DIFFRACTION-QUALITY WILD-TYPE COLICIN IA CRYSTALS. CRYSTALS WERE HARVESTED TO 1.1 M NA2SO4, 200 MM NACL, 20 MM NA-CITRATE (PH 5.2), AND 5 MM DTT. FOR DERIVATIZATION, CRYSTALS WERE WASHED IN DTT-FREE HARVEST BUFFER AND SOAKED FOR ONE WEEK IN 1 MM CH3HGCL., vapor diffusion - hanging drop - streak seeding |
