Experiment: 1914

SIGNAL RECOGNITION PARTICLE ALU RNA BINDING HETERODIMER, SRP9/14

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	hanging drop	7.7	277	THE SRPPHI14-9 PROTEIN WAS CRYSTALLIZED (BIRSE ET AL., FEBS LETTERS, 1996) BY THE HANGING DROP METHOD IN 2.0 M NAH2/K2H PO4, PH 7.7, 2% MPD, 1.0 MM NAN3 AT 4 DEGREES C WITH A FINAL PROTEIN CONCENTRATION OF 5-8 MG ML-1. CRYSTALS FORMED OVER 2-3 WEEKS AND WERE TYPICALLY 150 X 150 X 300 MM3 IN SPACE, hanging drop, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
3	34

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.02	α = 90
b = 69.02	β = 90
c = 90.44	γ = 90

Symmetry
Space Group	P 43 2 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 MIRRORS	1996-09-19	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID2	0.900, 1.100	ESRF	ID2

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	2.53	30	98.7	0.069	0.069	5.8	5		36596		3

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)
	2.53	2.6	97.2		0.0218	0.0218	2.4	4.2

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 (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MULTIPLE ISOMORPHOUS REPLACEMENT	THROUGHOUT	2.53	20	2	7634		98.7	0.248	0.248	0.2506	0.299	0.289	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]

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1383
Nucleic Acid Atoms
Solvent Atoms	39
Heterogen Atoms	2

Software

Software
Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
MOSFLM	data reduction
CCP4	data scaling
X-PLOR	phasing