2WJM

Lipidic sponge phase crystal structure of the photosynthetic reaction centre from Blastochloris viridis (low dose)

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	ESRF BEAMLINE ID14-3
Synchrotron site	ESRF
Beamline	ID14-3
Temperature [K]	100
Detector technology	CCD
Collection date	2007-02-08
Detector	ADSC CCD
Spacegroup name	P 21 21 2
Unit cell lengths	84.450, 138.498, 177.770
Unit cell angles	90.00, 90.00, 90.00

Refinement procedure

Resolution	176.780 - 1.950
R-factor	0.17446
Rwork	0.173
R-free	0.20122
Structure solution method	MOLECULAR REPLACEMENT
Starting model (for MR)	2prc
RMSD bond length	0.017
RMSD bond angle	2.090
Data reduction software	MOSFLM
Data scaling software	SCALA
Phasing software	AMoRE
Refinement software	REFMAC (5.2.0019)

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	45.900	2.060
High resolution limit [Å]	1.950	1.950
Rmerge	0.090	0.730
Number of reflections	152112
<I/σ(I)>	10.9	2.1
Completeness [%]	96.2	86.4
Redundancy	4.3	3.6

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	LIPIDIC CUBIC PHASE	8		MONOOLEIN WAS MIXED WITH WATER IN RATIO OF 60:40 (W/W) UNTIL A VISCOUS NON-BIREFRINGENT LCP WAS FORMED. THEREAFTER, LIPIDIC-SPONGE PHASE INITIATING SOLUTION (20% JEFFAMINE M600, 1M HEPES PH=8.0, 0.7M (NH4)2SO4 AND 2.5% 1,2,3-HEPTANETRIOL) WAS ADDED IN A RATIO OF 1 TO 4 (V/V) AND EQUILIBRATED UNTIL PHASE SEPARATION HAS OCCURRED. THE UPPER LIPIDIC-SPONGE PHASE WAS HARVESTED AND 1UL WAS USED AS A PRECIPITANT SOLUTION TOGETHER WITH 1UL OF 25 MG/ML PROTEIN SOLUTION IN A HANGING-DROP, VAPOUR-DIFFUSION EXPERIMENT. TO IMPROVE CRYSTAL QUALITY 1UL OF ADDITIVE 1M TRI-NA-CITRATE HAS BEEN ADDED TO THE CRYSTALLIZATION DROP.