2IH2

Crystal structure of the adenine-specific DNA methyltransferase M.TaqI complexed with the cofactor analog AETA and a 10 bp DNA containing 5-methylpyrimidin-2(1H)-one at the target base partner position

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.3	293	3 microliters crystallization buffer (10 mM Tris/HCl, 300 mM NaCl, pH 7.3) containing the complex plus 1 microliter reservoir solution (100 mM KCl, 100 mM MgCl2, 6% isopropanol, 50 mM sodium cacodylate, pH 6.0), VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.15	42.66

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 59.439	α = 90
b = 68.875	β = 92.27
c = 114.349	γ = 90

Symmetry
Space Group	P 1 21 1

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 105	ID14-2 (mirror)	2003-02-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-2		ESRF	ID14-2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym I (Observed)	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	1.6	19.66	95.8	0.117	0.117	11.95	7.2	121645	116532			18.55

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.6	1.65	58.6		0.34	0.34	3.58	3.92	10668

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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	PDB ENTRY 1G38	1.61	19.64	121568	116531	5826	95.86	0.16195	0.16022	0.19508	RANDOM	14.678

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]
-0.13		-0.17	0.32		-0.2

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.363
r_dihedral_angle_4_deg	14.224
r_dihedral_angle_3_deg	12.89
r_dihedral_angle_1_deg	6.023
r_scangle_it	2.589
r_scbond_it	1.69
r_angle_refined_deg	1.409
r_mcangle_it	1.196
r_mcbond_it	0.772
r_nbtor_refined	0.311
r_nbd_refined	0.197
r_symmetry_vdw_refined	0.149
r_symmetry_hbond_refined	0.147
r_xyhbond_nbd_refined	0.138
r_chiral_restr	0.086
r_bond_refined_d	0.009
r_gen_planes_refined	0.006
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6378
Nucleic Acid Atoms	808
Solvent Atoms	1413
Heterogen Atoms	74

Software

Software
Software Name	Purpose
REFMAC	refinement
ProDC	data collection
MAR345	data collection
XDS	data scaling
MOLREP	phasing