1W1P

Crystal structure of S. marcescens chitinase B in complex with the cyclic dipeptide inhibitor cyclo-(Gly-L-Pro) at 2.1 A resolution

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1O6I	WWPDB ENTRY 1O6I

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7		1.5 M AMMONIUM SULPHATE 0.1 M HEPES PH 7 25 % GLYCEROL

Crystal Properties
Matthews coefficient	Solvent content
2.47	49

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 56.07	α = 90
b = 103.906	β = 90
c = 186.439	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	RIGAKU RAXIS IV	MIRRORS		M	SINGLE WAVELENGTH

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

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	2.1	20	89.7	0.07	22.79	3.22		57855		1	20.5

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	2.1	2.18	90.9		0.26	5.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	WWPDB ENTRY 1O6I	2.1	24.91	57797	581	48.1	0.199	0.199	0.249	RANDOM	29.46

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]
0.86			3.18		-4.04

RMS Deviations
Key	Refinement Restraint Deviation
c_scangle_it	2.86
c_scbond_it	2.15
c_mcangle_it	2.12
c_mcbond_it	1.49
c_angle_deg	1.45177
c_bond_d	0.009586
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	7815
Nucleic Acid Atoms
Solvent Atoms	949
Heterogen Atoms	172

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing