1KFF

An engineered streptavidin with improved affinity for the strep-tag II peptide: apo-SAM1

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	ROTATING ANODE
Source details	RIGAKU RU300
Temperature [K]	298
Detector technology	IMAGE PLATE
Collection date	2001-01-10
Detector	MARRESEARCH
Wavelength(s)	1.5418
Spacegroup name	P 1 21 1
Unit cell lengths	58.419, 86.916, 47.196
Unit cell angles	90.00, 98.90, 90.00

Refinement procedure

Resolution	41.100 - 1.900
R-factor	0.17 *
Rwork	0.170
R-free	0.22900 *
Structure solution method	FOURIER SYNTHESIS
Starting model (for MR)	1swu
RMSD bond length	0.016
RMSD bond angle	2.868
Data reduction software	DENZO
Data scaling software	SCALEPACK
Phasing software	CNS
Refinement software	CNS

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	99.000 *	1.970
High resolution limit [Å]	1.900	1.900
Rmerge	0.050 *
Total number of observations	52768 *
Number of reflections	33067 *
<I/σ(I)>	13.2	1.9
Completeness [%]	89.2	85.5
Redundancy	1.6	1.5

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION, HANGING DROP	8 *	20 *	100 mM Na2HPO4, 1.2-M (NH4)2SO4, pH 7.3, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystallization Reagents in Literatures

ID	crystal ID	solution	reagent name	concentration (unit)	details
1	1	drop	protein	22 (mg/ml)
2	1	drop	Tris-HCl	5 (mM)	pH8.0