6HAE

Crystal structure of [Fe]-hydrogenase (Hmd) from Methanococcus aeolicus in complex with FeGP cofactor and methenyl-tetrahydromethanopterin (close form B)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7	298	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).

Crystal Properties
Matthews coefficient	Solvent content
2.29	46.22

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 80.015	α = 90
b = 156.48	β = 90
c = 53.654	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	PIXEL	DECTRIS PILATUS 6M		2017-07-06	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X10SA	0.99992	SLS	X10SA

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.85	44.56	97.4	0.124	0.135	0.055	0.997	8.6	6		56771			26.94

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.85	1.95	85		1.133	1.301	0.627	0.323	1.2	4.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	6HAC	1.85	44.56	56710	2804	97.1	0.163	0.161	0.192	RANDOM	28.83

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]
3.8163			-1.9962		-1.8201

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	12.5
t_omega_torsion	2.83
t_angle_deg	1.11
t_bond_d	0.01
t_dihedral_angle_d
t_incorr_chiral_ct
t_pseud_angle
t_trig_c_planes
t_gen_planes
t_it
t_nbd
t_improper_torsion
t_chiral_improper_torsion
t_sum_occupancies
t_utility_distance
t_utility_angle
t_utility_torsion
t_ideal_dist_contact

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5132
Nucleic Acid Atoms
Solvent Atoms	592
Heterogen Atoms	264

Software

Software
Software Name	Purpose
BUSTER	refinement
XDS	data reduction
SCALA	data scaling
PHASER	phasing