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Crystal structure of [Fe]-hydrogenase (Hmd) from Methanococcus aeolicus in complex with FeGP cofactor and methenyl-tetrahydromethanopterin (close form B)
Crystallization of [Fe]-hydrogenase-methenyl-H4MPT+ complex was performed in an anaerobic tent with gas phase 100%N2 at room temperature under dark condition. The reconstituted [Fe]-hydrogenase holoenzyme (50 mg/ml) was mixed with 10-mM methenyl-H4MPT+, both of which contained 10-mM MOPS/KOH pH 7.0. The final concentrations of [Fe]-hydrogenase and methenyl-H4MPT+ were 24 mg/ml and 3 mM, respectively. After incubating the mixture in this tent under dark condition for 5 min, the enzyme solution was centrifuged using MiniSpin-plus (Eppendorf) at 8000 rpm for 5 min by using centrifugal filters made of polyvinylidene fluoride (PVDF, Millipore). The crystallization solution contained 20 % w/v polyethylene glycol 3350, 200 mM sodium thiocyanate and 3% w/v 1,5-diaminopentane dihydrochloride with a ratio of protein mixture and crystallization reservoir of 0.7 ul / 0.7 ul drops (in 96 well-plates).