1A9N

CRYSTAL STRUCTURE OF THE SPLICEOSOMAL U2B''-U2A' PROTEIN COMPLEX BOUND TO A FRAGMENT OF U2 SMALL NUCLEAR RNA

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.3		50MM NACL, 9MM MGCL2, 0.25 MM SPERMINE, 0.25% N-OCTYL-BETA-D-GLUCOPYRANOSIDE, 50MM TRIS-CL PH 7.3, 1% PEG600

Crystal Properties
Matthews coefficient	Solvent content
2.69	42

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 98.37	α = 90
b = 128.24	β = 90
c = 66.65	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MARRESEARCH	TOROIDAL MIRROR	1996-09-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ELETTRA BEAMLINE 5.2R		ELETTRA	5.2R

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	2.38	25.9	94.7	0.061	0.061	8.3	4.2		32587		6	59

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)
	2.38	2.51	95		0.236	0.236	3	2.5

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-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	SIR	THROUGHOUT	2.38	15	32138	32138	1647	95.8	0.282	0.25	0.328	0.29	RANDOM	55

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]
0.3			-3.2		0.5

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	21.9
p_staggered_tor	20
p_scangle_it	4.9
p_mcangle_it	3.9
p_scbond_it	3.4
p_mcbond_it	2.6
p_planar_tor	1.2
p_multtor_nbd	0.253
p_singtor_nbd	0.189
p_chiral_restr	0.113

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4182
Nucleic Acid Atoms	1006
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
SHARP	phasing
REFMAC	refinement
CCP4	data scaling

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.