3O3X

Crystal structure of gp41-5, a single-chain 5-helix-bundle based on HIV gp41

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	298	0.1 M HEPES pH 7.5, 20% v/v iPrOH, 20% w/v PEG 4000 , VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.19	43.76

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 54.459	α = 90
b = 57.936	β = 90
c = 61.689	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	MARMOSAIC 225 mm CCD		2008-02-05	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 21-ID-F	0.97872	APS	21-ID-F

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.45	50	99.7	0.097	21.3	7.2		34965

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	5-helix-bundle derived from PDB entry 1AIK	1.45	25	33160	1748	99.45	0.15195	0.15033	0.18121	RANDOM	15.144

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]
-0.79			-0.87		1.66

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.859
r_dihedral_angle_4_deg	26.842
r_dihedral_angle_3_deg	12.122
r_sphericity_free	7.183
r_scangle_it	5.11
r_sphericity_bonded	4.681
r_dihedral_angle_1_deg	4.522
r_scbond_it	3.387
r_mcangle_it	2.378
r_rigid_bond_restr	1.627
r_mcbond_it	1.54
r_angle_refined_deg	1.446
r_angle_other_deg	0.95
r_mcbond_other	0.804
r_chiral_restr	0.089
r_bond_refined_d	0.013
r_gen_planes_refined	0.006
r_bond_other_d	0.001
r_gen_planes_other	0.001
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1548
Nucleic Acid Atoms
Solvent Atoms	238
Heterogen Atoms	12

Software

Software
Software Name	Purpose
MD2	data collection
PHASER	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling