2IH4

Crystal structure of the adenine-specific DNA methyltransferase M.TaqI complexed with the cofactor analog AETA and a 10 bp DNA containing pyrrolo-dC 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	298	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 298K

Crystal Properties
Matthews coefficient	Solvent content
2.01	38.81

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 59.197	α = 90
b = 66.576	β = 90.99
c = 111.308	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 4	ID14-3 (mirror)	2005-05-13	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-3		ESRF	ID14-3

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	2.1	20	93.4	0.129	0.129	6.96	3.04	50786	47417			27.88

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	2.1	2.2	96.1		0.504	0.504	2.17	2.96	6569

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	2.1	19.99	50716	47415	2370	93.49	0.20867	0.20567	0.26476	RANDOM	23.449

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]
-1.77		0.16	2.24		-0.46

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.702
r_dihedral_angle_4_deg	16.313
r_dihedral_angle_3_deg	15.75
r_dihedral_angle_1_deg	6.29
r_scangle_it	1.75
r_angle_refined_deg	1.23
r_scbond_it	1.068
r_mcangle_it	0.828
r_mcbond_it	0.472
r_nbtor_refined	0.307
r_symmetry_vdw_refined	0.196
r_nbd_refined	0.188
r_symmetry_hbond_refined	0.143
r_xyhbond_nbd_refined	0.14
r_chiral_restr	0.072
r_bond_refined_d	0.007
r_gen_planes_refined	0.004
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	814
Solvent Atoms	493
Heterogen Atoms	56

Software

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