1JIA

STRUCTURE OF A BASIC PHOSPHOLIPASE A2 FROM AGKISTRODON HALYS PALLAS AT 2.13A RESOLUTION

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		9.5		THE PROTEIN SOLUTIONS CONTAINED 10MM CA2+, 0.1M NACL, 5% PEG 4K IN 0.01M CHESS BUFFER (PH 9.5) AND AN ENZYME CONCENTRATION OF 11MG/ML; THE SOLUTION IN RESERVOIR CONTAINED 10% PEG 4K IN SAME BUFFER, ROOM TEMPERATURE OF 17 DEGREES C.

Crystal Properties
Matthews coefficient	Solvent content
2.09	37

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 97.13	α = 90
b = 103.69	β = 90
c = 23.27	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	280	AREA DETECTOR	SIEMENS-NICOLET X200B		1995-05-19	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH2R

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	2.13	40	86.1	0.0459	31.2	2.5		12001			26.24

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)
	2.13	2.23	46.28		0.176	4.9	1.6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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	STRUCTURE REFINEMENT	FULL REFINEMENT CONSISTING OF INITIAL MINIMIZATION, SLOW COOLING-SA 3000K, POSITIONAL AND B-FACTOR REFINEMENT.	2.13	6	3	10174	1063	77.8	0.152	0.152	0.255	RANDOM	25.41

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_dihedral_angle_d	23.4
x_angle_deg	2.72
x_improper_angle_d	1.29
x_bond_d	0.013
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1916
Nucleic Acid Atoms
Solvent Atoms	190
Heterogen Atoms	2

Software

Software
Software Name	Purpose
XENGEN	data collection
XENGEN	data reduction
X-PLOR	model building
X-PLOR	refinement
XENGEN	data scaling
X-PLOR	phasing