2F98

Crystal structure of the polyketide cyclase AknH with bound substrate and product analogue: implications for catalytic mechanism and product stereoselectivity.

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.5	293	2.0M ammonium Chloride, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
3.4	63.81

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 152.271	α = 90
b = 152.271	β = 90
c = 109.43	γ = 120

Symmetry
Space Group	H 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	MAR CCD 165 mm		2003-12-27	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-3	0.931	ESRF	ID14-3

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.1	56.48	100			55241	55241		-3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.1	2.2	100

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1SJW	2.1	56.48	55241	52433	2804	100	0.19469	0.19342	0.21838	RANDOM	29.42

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]
-0.82	-0.41		-0.82		1.24

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	5.637
r_scangle_it	2.451
r_scbond_it	1.517
r_angle_refined_deg	1.17
r_mcangle_it	1.03
r_mcbond_it	0.55
r_symmetry_hbond_refined	0.223
r_nbd_refined	0.204
r_symmetry_vdw_refined	0.188
r_xyhbond_nbd_refined	0.144

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	5.637
r_scangle_it	2.451
r_scbond_it	1.517
r_angle_refined_deg	1.17
r_mcangle_it	1.03
r_mcbond_it	0.55
r_symmetry_hbond_refined	0.223
r_nbd_refined	0.204
r_symmetry_vdw_refined	0.188
r_xyhbond_nbd_refined	0.144
r_chiral_restr	0.085
r_bond_refined_d	0.01
r_gen_planes_refined	0.004
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4631
Nucleic Acid Atoms
Solvent Atoms	245
Heterogen Atoms	132

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling
MOLREP	phasing

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.