1QRF

A CLOSER LOOK AT THE ACTIVE SITE OF GAMMA-CARBONIC ANHYDRASES: HIGH RESOLUTION CRYSTALLOGRAPHIC STUDIES OF THE CARBONIC ANHYDRASE FROM METHANOSARCINA THERMOPHILA

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	SSRL BEAMLINE BL7-1
Synchrotron site	SSRL
Beamline	BL7-1
Temperature [K]	100
Detector technology	IMAGE PLATE
Collection date	1997-07-19
Detector	MARRESEARCH
Spacegroup name	P 21 3
Unit cell lengths	82.608, 82.608, 82.608
Unit cell angles	90.00, 90.00, 90.00

Refinement procedure

Resolution	20.000 - 1.550
R-factor	0.21
Rwork	0.205
R-free	0.22900
Structure solution method	ISOMORPHOUS REPLACEMENT
RMSD bond length	0.014
RMSD bond angle	1.700
Data reduction software	DENZO
Data scaling software	SCALEPACK
Refinement software	REFMAC

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	20.000	1.610
High resolution limit [Å]	1.550	1.550
Rmerge	0.071	0.276
Total number of observations	91423 *
Number of reflections	25247
<I/σ(I)>	15
Completeness [%]	91.5 *	90.3
Redundancy	3.6	3

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION, HANGING DROP	6.2 *	22 *	PEG 8000, ammonium sulfate, pH 5.8, VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystallization Reagents in Literatures

ID	crystal ID	solution	reagent name	concentration (unit)	details
1	1	drop	protein	10 (mg/ml)
2	1	drop	phosphate	5 (mM)
3	1	reservoir	PEG8000	5 (%)
4	1	reservoir	ammonium sulfate	0.5 (M)