1SZA

The RNA polymerase II CTD in mRNA processing: beta-turn recognition and beta-spiral model

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5	298	25 % (v/v) ethylene glycol, 5 % (v/v) PEG 550, pH 7.5, VAPOR DIFFUSION, HANGING DROP; native crystals were soaked with synthetic peptide, temperature 298K, pH 7.50

Crystal Properties
Matthews coefficient	Solvent content
2.53	51.45

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.62	α = 90
b = 67	β = 90
c = 135	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	MARRESEARCH		2003-12-13	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X06SA		SLS	X06SA

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	2.2	20	99.4	0.064	12.5	5.5		25002

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)
	2.2	2.3	98.6		0.152	7.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	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	2.2	20	27237	25002	1265	99.4	0.211	0.211	0.257	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
c_scangle_it	3.294
c_scbond_it	2.301
c_mcangle_it	2.196
c_mcbond_it	1.408
c_angle_deg	1.104
c_bond_d	0.007
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3508
Nucleic Acid Atoms
Solvent Atoms	145
Heterogen Atoms

Software

Software
Software Name	Purpose
MAR345	data collection
XDS	data reduction
AMoRE	phasing
CNS	refinement
XDS	data scaling