4PER

Structure of Gallus gallus ribonuclease inhibitor complexed with Gallus gallus ribonuclease I

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	APS BEAMLINE 21-ID-G
Synchrotron site	APS
Beamline	21-ID-G
Temperature [K]	100
Detector technology	CCD
Collection date	2012-07-11
Detector	MARMOSAIC 300 mm CCD
Wavelength(s)	0.97857
Spacegroup name	P 21 21 21
Unit cell lengths	52.662, 84.538, 121.661
Unit cell angles	90.00, 90.00, 90.00

Refinement procedure

Resolution	39.815 - 1.920
R-factor	0.2049
Rwork	0.202
R-free	0.25350
Structure solution method	MOLECULAR REPLACEMENT
RMSD bond length	0.009
RMSD bond angle	1.158
Phasing software	PHASER
Refinement software	PHENIX ((phenix.refine: 1.8.4_1496))

Data quality characteristics

	Overall	Inner shell	Outer shell
Low resolution limit [Å]	50.000	50.000	1.850
High resolution limit [Å]	1.820	4.940	1.820
Rmerge	0.134	0.032	0.687
Total number of observations	201341
Number of reflections	50875
<I/σ(I)>	10.4
Completeness [%]	99.4	94	99.8
Redundancy	4	3.9	3.7

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION, HANGING DROP	3.5	298	1:1 protein solution (20 mM HEPES-NaOH, 10 mM DTT, 2% w/v glycerol, pH 7.5) to well solution (100 mM citric acid, pH 3.5, 21% PEG1500), cryoprotectant: 100 mM citric acid, pH 3.5, 21% PEG1500, 15% ethylene glycol