3U11

Tetramerization dynamics of the C-terminus underlies isoform-specific cAMP-gating in HCN channels

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	5	278	25% PEG 3350, 0.4M Sodium Acetate buffer, pH 5.0, 0.5M dibasic Ammonium phosphate, VAPOR DIFFUSION, temperature 278K

Crystal Properties
Matthews coefficient	Solvent content
2.29	46.28

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 88.31	α = 90
b = 88.31	β = 90
c = 57.84	γ = 90

Symmetry
Space Group	P 4

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 315r		2010-02-26	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID29	0.97238	ESRF	ID29

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	2.5	62.44	100	0.132		4.8		15615	10	10

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.5	2.64	100

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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	THROUGHOUT	1Q43	2.5	62.44	2	14834	14834	781	99.99	0.19727	0.19727	0.19306	0.27737	RANDOM	21.282

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]
-0.14			-0.14		0.27

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.727
r_dihedral_angle_3_deg	20.164
r_dihedral_angle_4_deg	19.452
r_dihedral_angle_1_deg	11.298
r_scangle_it	3.822
r_scbond_it	2.301
r_angle_refined_deg	1.746
r_mcangle_it	1.445
r_mcbond_it	0.738
r_chiral_restr	0.132

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.727
r_dihedral_angle_3_deg	20.164
r_dihedral_angle_4_deg	19.452
r_dihedral_angle_1_deg	11.298
r_scangle_it	3.822
r_scbond_it	2.301
r_angle_refined_deg	1.746
r_mcangle_it	1.445
r_mcbond_it	0.738
r_chiral_restr	0.132
r_bond_refined_d	0.015
r_gen_planes_refined	0.007

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3310
Nucleic Acid Atoms
Solvent Atoms	147
Heterogen Atoms	74

Software

Software
Software Name	Purpose
ADSC	data collection
MOLREP	phasing
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.