1XZ4

Intersubunit Interactions Associated with Tyr42alpha Stabilize the Quaternary-T Tetramer but are not Major Quaternary Constraints in Deoxyhemoglobin: alphaY42A deoxyhemoglobin no-salt

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	batch	4.6	298	15% PEG 4000, 50 mM sodium acetate, 100 mM ammonium acetate, 3 mM sodium dithionite, 20 mg/ml Hb, pH 4.6, batch, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.43	49.38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 84.1	α = 90
b = 111.9	β = 90
c = 64	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	298	AREA DETECTOR	SDMS	graphite	1996-09-30	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200	1.5418

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	1.98	50	96.7	0.065	9.8	6.5	41133	41133

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)
	1.98	2.13	84.1		0.242	1.7	2.9	7049

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 plus local R-free analysis	pdb entry 1XZ2	2	10	41133	36294	3999	97.98	0.18674	0.18274	0.22372	10 mutaully exclusive test sets matched to pdb entry 1XZ2	25.021

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]
-0.53			1.05		-0.51

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_3_deg	16.282
r_scangle_it	4.836
r_dihedral_angle_1_deg	3.853
r_scbond_it	3.022
r_angle_refined_deg	1.89
r_mcangle_it	1.808
r_angle_other_deg	1.187
r_mcbond_it	0.957
r_symmetry_vdw_other	0.41
r_symmetry_vdw_refined	0.358
r_xyhbond_nbd_refined	0.24
r_nbd_refined	0.229
r_symmetry_hbond_refined	0.225
r_nbd_other	0.197
r_xyhbond_nbd_other	0.152
r_chiral_restr	0.103
r_bond_refined_d	0.02
r_gen_planes_refined	0.008
r_gen_planes_other	0.007
r_bond_other_d

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4366
Nucleic Acid Atoms
Solvent Atoms	182
Heterogen Atoms	172

Software

Software
Software Name	Purpose
REFMAC	refinement
SDMS	data reduction
SDMS	data scaling
X-PLOR	phasing