1C74 | pdb_00001c74

Structure of the double mutant (K53,56M) of phospholipase A2

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1MKT

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	vapor diffusion method	7.2	293	Tris Buffer, MPD, 50% MPD reservoir, 15Mg/ml protein, 5 mM CaCl2, pH 7.2, vapor diffusion method, temperature 293.0K

Crystal Properties
Matthews coefficient	Solvent content
2.31	46.79

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.41	α = 90
b = 46.41	β = 90
c = 102.72	γ = 120

Symmetry
Space Group	P 31 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	293	IMAGE PLATE	MARRESEARCH		1999-08-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	SIEMENS

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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	1.9	15	89	0.092		4.32	9733	9733

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.9	1.97	71		0.333			857

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-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	x-plor	1MKT	1.9	10	42068	949	89	0.189	0.1768	0.224	0.2033	random

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_bond_d	0.011

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	955
Nucleic Acid Atoms
Solvent Atoms	106
Heterogen Atoms	1

Software

Software
Software Name	Purpose
DENZO	data reduction
X-PLOR	model building
X-PLOR	refinement
SCALEPACK	data scaling
X-PLOR	phasing