7TPV

Selenium-free nitrogenase Fe protein (Av2) from A. vinelandii (5mM KSeCN Soaked)

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	SSRL BEAMLINE BL12-2
Synchrotron site	SSRL
Beamline	BL12-2
Temperature [K]	100
Detector technology	PIXEL
Collection date	2021-03-12
Detector	DECTRIS PILATUS 6M
Wavelength(s)	0.97869, 0.98062
Spacegroup name	P 2 21 21
Unit cell lengths	45.363, 73.691, 74.170
Unit cell angles	90.00, 90.00, 90.00

Refinement procedure

Resolution	38.700 - 1.490
R-factor	0.176
Rwork	0.175
R-free	0.19890
Structure solution method	MOLECULAR REPLACEMENT
Starting model (for MR)	6n4l
Data reduction software	XDS
Data scaling software	Aimless (0.7.7)
Phasing software	MOLREP
Refinement software	PHENIX (1.19.2-4158)

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	45.350	1.520
High resolution limit [Å]	1.490	1.490
Rmerge	0.071	1.095
Rmeas	0.076	1.191
Rpim	0.029	0.462
Number of reflections	41143	2448
<I/σ(I)>	17.9
Completeness [%]	99.4	99.5
Redundancy	13	12.4
CC(1/2)	0.999	0.877

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION, SITTING DROP	7.5	298	36-41% PEG400, 0.1-0.3 M sodium chloride, 0.1 M HEPES, pH 7.5, 2.5 mM dithionite, 0.17 mM Cymal-7, 5 mM potassium selenocyanate