2P6A

The structure of the Activin:Follistatin 315 complex

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	298	20-23% PEG 1000, 200mM MgCl2, 3% EtOH, 20mM Trimethyl-amine HCl, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298 K

Crystal Properties
Matthews coefficient	Solvent content
2.53	51.47

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 104.641	α = 90
b = 106.584	β = 90
c = 87.568	γ = 90

Symmetry
Space Group	P 2 2 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	298	CCD	MARMOSAIC 300 mm CCD		2006-06-26	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 5ID-B	1.0	APS	5ID-B

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	3.4	34.344	99.7	0.16	0.16	4	7.2		13978

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)
1	3.4	3.58	100		0.708	0.708	1	7.3	1994

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	one activin A monomer and ND, FSD1, and FSD2 of one follistatin 288 molecule (PDB 2B0U)	3.4	31.01	13955	283	99.69	0.225	0.223	0.324	RANDOM	46.862

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]
-0.01			-0.01		0.03

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.349
r_scangle_it	25.907
r_scbond_it	22.456
r_dihedral_angle_3_deg	21.821
r_mcangle_it	21.07
r_dihedral_angle_4_deg	18.124
r_mcbond_it	16.71
r_dihedral_angle_1_deg	8.805
r_angle_refined_deg	1.945
r_symmetry_vdw_refined	0.524
r_symmetry_hbond_refined	0.478
r_nbd_refined	0.402
r_nbtor_refined	0.367
r_xyhbond_nbd_refined	0.318
r_chiral_restr	0.128
r_bond_refined_d	0.014
r_gen_planes_refined	0.009

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5952
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
SCALA	data scaling
PHASER	phasing
DM	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
MOSFLM	data reduction
CCP4	data scaling