3DEO

Structural basis for specific substrate recognition by the chloroplast signal recognition particle protein cpSRP43

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.5	293	0.2M MgCl2, 0.1M Bis-Tris pH 5.5, 25%(w/v) PEG 3350, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.12	41.89

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 51.146	α = 90
b = 52.794	β = 90
c = 62.849	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	100	CCD	ADSC QUANTUM 315		2006-02-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID23-1	0.9793	ESRF	ID23-1

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	1.5	40	0.99	0.055	7.6	5.4	27821	27737

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)
	1.5	1.58	0.99		0.418	1.8	5.5	3951

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1NOR	1.5	40	27821	27735	1394	99.43	0.171	0.168	0.211	RANDOM	17.598

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]
-0.04			-0.14		0.18

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.604
r_dihedral_angle_4_deg	17.185
r_dihedral_angle_3_deg	12.212
r_sphericity_free	5.334
r_dihedral_angle_1_deg	5.194
r_scangle_it	4.273
r_sphericity_bonded	3.848
r_scbond_it	3.095
r_mcangle_it	2.197
r_rigid_bond_restr	1.915
r_mcbond_it	1.553
r_angle_refined_deg	1.38
r_nbtor_refined	0.307
r_symmetry_vdw_refined	0.271
r_nbd_refined	0.207
r_symmetry_hbond_refined	0.169
r_xyhbond_nbd_refined	0.147
r_chiral_restr	0.086
r_metal_ion_refined	0.014
r_bond_refined_d	0.013
r_gen_planes_refined	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1482
Nucleic Acid Atoms
Solvent Atoms	229
Heterogen Atoms	1

Software

Software
Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection