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The Hybrid Cluster Protein from the thermophilic methanogen Methanothermococcus thermolithotrophicus in a mixed redox state after soaking with hydroxylamine, at 1.36-A resolution.
Crystallisation was performed anaerobically by initial screening at 20 degree Celsius using the sitting drop method on 96-Well MRC 2-Drop polystyrene Crystallisation Plates (SWISSCI) in a Coy tent containing a N2/H2 (97:3%) atmosphere. The reservoir chamber was filled with 90 ul of crystallisation condition, and the crystallisation drop was formed by spotting 0.55 ul protein with 0.55 ul of 20% (w/v) PEG 3,350 and 200 mM Magnesium formate. The protein was crystallised at 9.9 mg/ml in 25 mM Tris/HCl pH 7.6, 2 mM dithiothreitol, 10% (v/v) glycerol. Densities in the electron density map suggest a contamination of another crystallisation condition spatially close and containing 30% (v/v) 2-Methyl-2,4-pentanediol, 20 mM Calcium chloride and 100 mM Sodium acetate, pH 4.6.
The crystal was soaked for 5.7 min in a solution of 100 mM hydroxylamine/HCl in the crystallisation condition and then soaked in the crystallisation solution supplemented with 20% v/v ethylene glycol for a few seconds before freezing in liquid nitrogen.