2I2R

Crystal structure of the KChIP1/Kv4.3 T1 complex

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1S1G	PDB entry 1S1G (For Kv4.3 T1 domain), PDB entry 1S6C (For KChIP1)
experimental model	PDB	1S6C	PDB entry 1S1G (For Kv4.3 T1 domain), PDB entry 1S6C (For KChIP1)

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	296	15% PEG3000, 0.2M sodium chloride, 0.1M Bis-Tris, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K

Crystal Properties
Matthews coefficient	Solvent content
2.49	50.51

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 93.151	α = 91
b = 98.105	β = 112.56
c = 97.783	γ = 111.77

Symmetry
Space Group	P 1

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 210	Double Crystal Si(111)	2005-03-06	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 8.3.1	1.116	ALS	8.3.1

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	3.35	91.29	96.9	0.059	8.2	2.2	41773	40483			103

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	3.35	3.54	96.9		0.425	1.7	2.2	5873

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1S1G (For Kv4.3 T1 domain), PDB entry 1S6C (For KChIP1)	3.35	91.29	38594	38594	2038	96.92	0.23807	0.23651	0.26811	RANDOM	124.874

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]
8.03	-0.81	3.49	-4.31	0.73	-1.62

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.977
r_dihedral_angle_3_deg	20.652
r_dihedral_angle_4_deg	19.737
r_dihedral_angle_1_deg	6.698
r_scangle_it	1.924
r_angle_refined_deg	1.415
r_scbond_it	1.076
r_mcangle_it	0.705
r_symmetry_hbond_refined	0.427
r_symmetry_vdw_refined	0.372
r_mcbond_it	0.347
r_nbtor_refined	0.317
r_nbd_refined	0.252
r_metal_ion_refined	0.21
r_xyhbond_nbd_refined	0.158
r_chiral_restr	0.101
r_bond_refined_d	0.014
r_gen_planes_refined	0.004
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	18942
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	28

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling
MOLREP	phasing