1CAH

STRUCTURE OF COBALT CARBONIC ANHYDRASE COMPLEXED WITH BICARBONATE

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1				CRYSTALLIZED IN 50 MM TRIS-HC1 2.4 M AMMONIUM SULFATE PH 8. 5 AND 1 MM HGC12 AT 4 DEG C (TILANDER, B., STRANDBERG, B. & FRIDBORG, K. (1965). CRYSTAL STRUCTURE ON HUMAN ERYTHROCYTIC CARBONIC ANHYDRASE C. J. MOL. BIOL. 12, 740-760). THE MERCURY IS SUBSEQUENTLY REMOVED BY MERCAPTOETHANOL AND THE ZINC ION WITH DIPICOLINATE. AFTER INSERTION OF COBALT (II), THE CRYSTALS ARE SOAKED IN 0.25 M BICARBONATE 3M AMMONIUM SULFATE 50 MM TRIS-HC1 PH 8.1 OVERNIGHT. THE PROCEDURE IS DESCRIBED IN DETAIL IN THE PAPER MENTIONED ABOVE.

Crystal Properties
Matthews coefficient	Solvent content
2.15	42.89

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 42.7	α = 90
b = 41.7	β = 104.6
c = 73	γ = 90

Symmetry
Space Group	P 1 21 1

Refinement

Statistics
Diffraction ID	Structure Solution Method	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		1.88	10	17858			0.16

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
p_orthonormal_tor	30.7
p_staggered_tor	16.4
p_planar_tor	3.4
p_scangle_it	3.053
p_scbond_it	1.964
p_mcangle_it	1.553
p_mcbond_it	0.96
p_chiral_restr	0.229
p_singtor_nbd	0.161
p_multtor_nbd	0.159
p_xhyhbond_nbd	0.155
p_planar_d	0.047
p_angle_d	0.037
p_bond_d	0.02
p_plane_restr	0.018
p_angle_deg
p_hb_or_metal_coord
p_xyhbond_nbd
p_transverse_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2079
Nucleic Acid Atoms
Solvent Atoms	217
Heterogen Atoms	5

Software

Software
Software Name	Purpose
PROFFT	refinement