2B9C | pdb_00002b9c

Structure of tropomyosin's mid-region: bending and binding sites for actin

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	289	Native: Three microliters of protein solution [6.35mg/ml MidTm; 20mM Tris-HCl pH7.0; 100mM NaCl; 2mM 2-mercaptoethanol and 2mM NaN3] were combined with two microliters of 14% PEG2k-MME, and the resultant drop was equilibrated against 1ml reservoir solution [7.5% PEG2k-MME; 120mM NaCl; 24mM Tris-HCl pH7.0] by vapor diffusion at 16 C. Se-Met: Two microliters of protein solution [18mg/ml MidTm; 20mM Tris-HCl pH6.9; 100mM NaCl; 10mM mercaptoethanol and 2mM NaN3] were combined with two microliters of precipitant solution [28-32% PEG2K-MME; 50mM NaCl; 20mM Tris-HCl pH6.9 and 5mM mercaptoethanol]. The resultant mixture was equilibrated against 1ml reservoir solution [24% PEG2K-MME; 50mM NaCl; 20mM Tris-HCL pH6.9 and 5mM mercaptoethanol] by vapor diffusion at 16C. , VAPOR DIFFUSION, HANGING DROP, temperature 289K

Crystal Properties
Matthews coefficient	Solvent content
3.07	59.94

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 80.515	α = 90
b = 80.515	β = 90
c = 112.453	γ = 120

Symmetry
Space Group	P 65

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 4			M	SINGLE WAVELENGTH
2	1	x-ray	100	CCD				M	MAD
3	1

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	CHESS BEAMLINE F1	0.9474	CHESS	F1
2	SYNCHROTRON	NSLS BEAMLINE X29A	0.9786, 0.9793, 0.9611	NSLS	X29A

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	2.3	20	99.4	0.069	15.9	4.7		18253		2

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)
	2.3	2.38	100		0.337	4.6	4.5

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	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	MAD	2.3	20	17760	706	96.8	0.256	0.2673	0.296	0.3011	random	63.133

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]
3.759	-7.579		3.759		-7.518

RMS Deviations
Key	Refinement Restraint Deviation
c_angle_deg	3.86603
c_bond_d	0.050567

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2301
Nucleic Acid Atoms
Solvent Atoms	349
Heterogen Atoms

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
RESOLVE	phasing
CNS	refinement
PDB_EXTRACT	data extraction