1SA3 | pdb_00001sa3

An asymmetric complex of restriction endonuclease MspI on its palindromic DNA recognition site

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5		MES, ammonium sulfate, calcium chloride, PEG 8000, glycerol, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 100K

Crystal Properties
Matthews coefficient	Solvent content
2.67	53.58

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 50.193	α = 90
b = 131.601	β = 109.69
c = 59.318	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	BRANDEIS - B4	double-crystal monochromator Si(111), beam focused by a toroidal mirror	2000-05-20	M	SINGLE WAVELENGTH
2	1	x-ray		M	SINGLE WAVELENGTH
3	1	x-ray		M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X12C	0.9207	NSLS	X12C

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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
1,2,3	1.95	100	97.4	0.043	24.5	2.93	53664	52241		-2.5	12.3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.95	1.98	99.9		0.275	3.6	2.89	2671

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	combination of MAD and MIRAS	THROUGHOUT	1.95	42.58	51260	51260	5172	97.3	0.225	0.225	0.223	0.22	0.252	0.25	RANDOM	28.2

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]
-2.04		2.02	5.24		-3.2

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	20.8
c_scangle_it	3.84
c_scbond_it	2.69
c_mcangle_it	2.5
c_mcbond_it	1.83
c_angle_deg	1.2
c_improper_angle_d	0.88
c_bond_d	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4206
Nucleic Acid Atoms	726
Solvent Atoms	331
Heterogen Atoms	2

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
DM	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.