Experiment: 1QBB

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1QBA	PDB ENTRY 1QBA

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.6		CRYSTAL WERE GROWN AT ROOM TEMPERATURE FROM HANGING DROPS CONTAINING 62% SATURATED AMMONIUM SULFATE, 1.5% ISOPROPANOL AND 100 MM CACODYLATE, PH 5.6. DERIVATIZATION CONDITIONS: SOLID CHITOBIOSE WAS ADDED TO THE MOTHER LIQUOR TO MAKE UP HIGH CONCENTRATED STOCK SOLUTION, 0.5 TO 1.0 MICRO LITERS OF THE STOCK SOLUTION WERE ADDED TO THE CRYSTALLISATION DROP CONTAINING CRYSTALS. THE CRYSTALS WERE MOUNTED IMMEDIATELY IN GLASS CAPILLARY. EXPOSURE TIME WAS LIMITED TO 10 MINUTES OR LESS. THESE CRYSTALS: 4 MINS 50 SECS. THE CHITOBIOSE WAS SUPPLIED BY SIGMA., vapor diffusion - hanging drop

Crystal Properties
Matthews coefficient	Solvent content
2.4	44.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 110.7	α = 90
b = 99.9	β = 90
c = 87.7	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	277	IMAGE PLATE	MARRESEARCH	SEGMENTED TOROIDAL MIRROR	1994-09-09	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X31		EMBL/DESY, HAMBURG	X31

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.99	15	99.7	0.084	14.8	4.1		66148		-3	16.6

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2.02	2.06	99.9		0.237	3.4	2.9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	R-FREE	PDB ENTRY 1QBA	2	15	-4	66148	66148	6509	99.7	0.148	0.151	0.14	0.212	RANDOM	14.3

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	26.4
p_staggered_tor	17.7
p_scangle_it	7.4
p_scbond_it	5
p_planar_tor	4.8
p_mcangle_it	3
p_mcbond_it	2.2
p_multtor_nbd	0.264
p_singtor_nbd	0.179
p_xyhbond_nbd	0.163

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6795
Nucleic Acid Atoms
Solvent Atoms	542
Heterogen Atoms	50

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
ARP/wARP	model building
PROLSQ	refinement

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.