1KQL

Crystal structure of the C-terminal region of striated muscle alpha-tropomyosin at 2.7 angstrom resolution

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		a specially built 56-residue two-stranded coiled-coil that contains a 24 residue fragment from the high resolution structure of the GCN4 leucine zipper

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.3	295	PEG 550 monomethylether, glycerol, sodium chloride, magnesium acetate, bicine, tris buffer, dithiothreitol, pH 8.3, VAPOR DIFFUSION, SITTING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
4.12	70

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 137.202	α = 90
b = 137.202	β = 90
c = 40.071	γ = 120

Symmetry
Space Group	P 64 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	95	CCD	ADSC QUANTUM 4	mirrors	2001-04-20	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	CHESS BEAMLINE A1	0.909	CHESS	A1

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	2.6	50	99.9	0.052	34.9	12	7229	7221	2	2	82.3

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)
	2.6	2.69	99.9		0.217	9.14	8.2	708

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 (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	Molecular replacement using a specially built model	THROUGHOUT	a specially built 56-residue two-stranded coiled-coil that contains a 24 residue fragment from the high resolution structure of the GCN4 leucine zipper	2.7	44.91	6469	6469	508	99.6	0.2551	0.2551	0.2523	0.2889	RANDOM	93.4

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]
2.22	15.96		2.22		-4.43

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	15.6
c_angle_deg	1
c_improper_angle_d	0.64
c_bond_d	0.007

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	892
Nucleic Acid Atoms
Solvent Atoms	27
Heterogen Atoms

Software

Software
Software Name	Purpose
AMoRE	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	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.