6YN4

Structure of D169A/E171A double mutant of chitinase Chit42 from Trichoderma harzianum complexed with chitintetraose.

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8	291	15 PEG 3000, 0.2 M Zinc Acetate, 0.1 M imidazole pH 8, 3% MPD Co-crystallization 2mM EDTA, 20mM chitintetraose. Cryoprotectant mother liquor supplemented with 20% PEG 400, 5 mM chitintetraose, 2 mM EDTA.

Crystal Properties
Matthews coefficient	Solvent content
2.47	50.27

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 68.352	α = 90
b = 68.352	β = 90
c = 177.757	γ = 90

Symmetry
Space Group	P 41 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	100	PIXEL	DECTRIS PILATUS 6M	KB focusing mirrors	2018-09-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALBA BEAMLINE XALOC	0.979240	ALBA	XALOC

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	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	1.82	48.38	99.9	0.107	0.117	0.045	0.997	14.2	6.5		38716

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.82	1.86	100		0.701	0.758	0.286	0.917	4.8	6.7

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	6EPB	1.82	48.38	36690	1987	99.76	0.1813	0.1797	0.2113	RANDOM	15.511

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]
0.58			0.58		-1.15

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.617
r_dihedral_angle_3_deg	12.748
r_dihedral_angle_4_deg	9.165
r_dihedral_angle_1_deg	6.452
r_angle_other_deg	1.565
r_angle_refined_deg	1.478
r_chiral_restr	0.075
r_bond_other_d	0.009
r_bond_refined_d	0.006
r_gen_planes_refined	0.006

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.617
r_dihedral_angle_3_deg	12.748
r_dihedral_angle_4_deg	9.165
r_dihedral_angle_1_deg	6.452
r_angle_other_deg	1.565
r_angle_refined_deg	1.478
r_chiral_restr	0.075
r_bond_other_d	0.009
r_bond_refined_d	0.006
r_gen_planes_refined	0.006
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2994
Nucleic Acid Atoms
Solvent Atoms	393
Heterogen Atoms	128

Software

Software
Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
Aimless	data scaling
MOLREP	phasing

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 R01GM133198.