1ABS

PHOTOLYSED CARBONMONOXY-MYOGLOBIN AT 20 K

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		9		PROTEIN WAS CRYSTALLIZED FROM 3.6 M AMMONIUM SULFATE. CRYSTALS WER SOAKED FOR 1 HOUR IN A THOROUGHLY DEGASSED AND N2 - SATURATED CRYOPROTECTANT SOLUTION MADE BY ADDITION OF 100 MG SUCROSE, 100 MG GLUCOSE AND 8 MG NA-DITHIONATE TO 1 ML OF 70% SATURATED AMMONIUM SULFATE WITH 50 MM TRIS. HCL PH 9.0. THEN THE SOLUTION WAS EXCHANGED AGAINST A CO SATURATED ONE. DISTINCT COLOR CHANGES ACCOMPANIED THE FORMATION OF UNLIGATED MYOGLOBIN FROM MET-MB AND MBCO FROM UNLIGATED MB.

Crystal Properties
Matthews coefficient	Solvent content
3.08	60.12

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 90.42	α = 90
b = 90.42	β = 90
c = 45.4	γ = 120

Symmetry
Space Group	P 6

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	20	IMAGE PLATE AREA DETECTOR	MARRESEARCH	YES	1994-03-19	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X12C		NSLS	X12C

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	1.5		90	0.063	0.068		3		30947

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.5	1.7	78

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	DIFFERENCE FOURIER	2MGK	1.5	7	29798		89	0.207	0.207		6.4

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_angle_deg	1.7
x_bond_d	0.01
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1225
Nucleic Acid Atoms
Solvent Atoms	119
Heterogen Atoms	50

Software

Software
Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
XSCALE	data scaling
X-PLOR	phasing