6HUX

HmdII from Methanocaldococcus jannaschii reconstitued with Fe-guanylylpyridinol (FeGP) cofactor and co-crystallized with methenyl-tetrahydromethanopterin at 2.5 A resolution

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	4YT4

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	5.5	281	HmdII from Methanocaldococcus jannaschii reconstituted with Fe-guanylylpyridinol cofactor was cocrystallized with methenyl-tetrahydromethanopterin using the sitting drop vapor diffusion method under N2/H2 (95%/5%) in red light condition. 20 mg/ml of reconstituted enzyme in 25 mM Tris pH 7.5, 5% glycerol, 150 mM NaCl, 2 mM DTT and 3 mM methenyl-tetrahydromethanopterin was spotted on a 96-well 2-drop MRC Crystallization Plates (Molecular Dimensions, Suffolk, UK) with a ratio of 0.7 ul of protein and 0.7 ul of reservoir solution. After several weeks, crystals appeared in 2 M LiSO4, 100 mM Sodium acetate pH 5.5, 100 mM MgSO4 and 5% v/v PEG 400. jHmdII crystal was cryoprotected in its mother liquor supplemented with 30% ethylene glycol before freezing in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.75	55.25

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 124.281	α = 90
b = 124.281	β = 90
c = 150.086	γ = 120

Symmetry
Space Group	H 3 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	CCD	ADSC QUANTUM 315r		2017-04-22	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE BM30A	0.9799	ESRF	BM30A

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	2.5	43.73	100	0.122	0.129	0.041	0.997	13.1	9.8		15610			64.85

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	2.5	2.64	99.9		1.341	1.415	0.447	0.686	2.2	9.9

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	4YT4	2.5	38.97	15602	739	99.9	0.168	0.165	0.219	RANDOM	64.84

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]
2.8028			2.8028		-5.6056

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	15.91
t_omega_torsion	2.07
t_angle_deg	0.99
t_bond_d	0.008
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	2790
Nucleic Acid Atoms
Solvent Atoms	53
Heterogen Atoms	157

Software

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