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HmdII from Desulfurobacterium thermolithotrophum reconstitued with Fe-guanylylpyridinol (FeGP) cofactor and co-crystallized with methenyl-tetrahydrofolate form A
dHmdII reconstituted with the Fe-guanylylpyridinol cofactor from Methanothermobacter marburgensis was cocrystallized with methenyl-tetrahydrofolate using the sitting drop vapor diffusion method at 281 K under N2/H2 (95%/5%) in red light condition. The reconstituted dHmdII holoenzyme was mixed with methenyl-tetrahydrofolate at the final concentrations of 1.6 mM. Methenyl-tetrahydrofolate was dissolved in 10% DMSO, and the final concentration of DMSO in the protein solution was 1.6%. 0.7 ul of dHmdII at 21 mg/ml (with Fe-guanylylpryridinol and methenyl-tetrahydrofolate) was spotted on a 96-well 2-drop MRC Crystallization Plates (Molecular Dimensions, Suffolk, UK) and 0.7 ul of reservoir solution was mixed. After 10 days, the crystals appeared in 20% PEG 3000 (w/v), 100 mM Tri-Sodium Citrate pH 5.5 (from the kit Wizard, Jean Bioscience).
Crystals were cryoprotected by a soak of few seconds in 20% PEG 3000 (w/v), 100 mM Tri-Sodium Citrate pH 5.5 and 20% glycerol before a flash freeze in liquid nitrogen.