Experiment: 1TUW

Structural and Functional Analysis of Tetracenomycin F2 Cyclase from Streptomyces glaucescens: A Type-II Polyketide Cyclase

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICROBATCH	7.5	278	Crystals of tetracenomycin F2 cyclase were grown by microbatch from a solution composed of 2.2 M (NH4)2SO4, 3 mg/ml protein, 50 mM HEPES pH 7.5 at 4 C (11). Large crystals were obtained by macroseeding with small crystals (0.06 mm x 0.08 mm) washed in macroseeding 1.4 M (NH4)2SO4, 50 mM HEPES pH 7.5 to slightly dissolve the crystal surfaces. After 3 to 4 weeks the crystals attained a size of 0.3 x 0.3 x 0.6 mm. Crystals of the selenomethionine labeled protein were obtained in a similar manner., Micro batch, temperature 278K

Crystal Properties
Matthews coefficient	Solvent content
2.32	47

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.7	α = 90
b = 46.7	β = 90
c = 188.3	γ = 120

Symmetry
Space Group	P 65 2 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	273	AREA DETECTOR	SIEMENS HI-STAR	gobel	2000-03-01	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200

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	1.9	30	92	0.027	23.1	8.8	11605	11355

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)
1	1.9	2	84		0.088	5.4

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work (Depositor)	R-Free (Depositor)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	1.9	30	9599	9599	480		0.199	0.199	0.199	0.245	random

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
t_dihedral_angle_d	19.3
t_angle_deg	2.61
t_bond_d	0.017

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	850
Nucleic Acid Atoms
Solvent Atoms	79
Heterogen Atoms	5

Software

Software
Software Name	Purpose
Histar	data collection
XDS	data reduction
SOLVE	phasing
TNT	refinement
HISTAR	data reduction
XDS	data scaling