4AHT

Parallel screening of a low molecular weight compound library: do differences in methodology affect hit identification

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	AUSTRALIAN SYNCHROTRON BEAMLINE MX1
Synchrotron site	Australian Synchrotron
Beamline	MX1
Temperature [K]	100
Detector technology	CCD
Collection date	2008-04-25
Detector	ADSC QUANTUM 210r
Spacegroup name	P 31
Unit cell lengths	70.742, 70.742, 66.608
Unit cell angles	90.00, 90.00, 120.00

Refinement procedure

Resolution	61.310 - 1.800
R-factor	0.16173
Rwork	0.160
R-free	0.19820
Structure solution method	MOLECULAR REPLACEMENT
Starting model (for MR)	4ahr
RMSD bond length	0.024
RMSD bond angle	2.428
Data reduction software	MOSFLM
Data scaling software	SCALA
Phasing software	PHASER
Refinement software	REFMAC (5.6.0117)

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	61.300	1.900
High resolution limit [Å]	1.800	1.800
Rmerge	0.070	0.500
Number of reflections	32746
<I/σ(I)>	16.6	2.4
Completeness [%]	94.7	73.4
Redundancy	5.3	3.5

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION, SITTING DROP	5.5	293	PROTEIN: 5.5MG/ML IN 40MM TRIS BUFFER AT PH 8.0, 250MM NACL, 30MM MGCL2, 5MM DTT. CRYSTALLANT: 100MM SODIUM ACETATE PH 5.0 TO 5.5, 1.2 TO 1.5M AMMONIUM SULFATE AT 20C IN SITTING DROP PLATES. FRAGMENTS WERE SOAKED INTO PREFORMED CRYSTALS 24-48 HOURS PRIOR TO DATA COLLECTION.