1C7T

BETA-N-ACETYLHEXOSAMINIDASE MUTANT E540D COMPLEXED WITH DI-N ACETYL-D-GLUCOSAMINE (CHITOBIASE)

X-RAY DIFFRACTION

---

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1C7S	PDB ENTRY 1C7S

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	4.8		CO-CRYSTALS WERE GROWN BY THE HANGING-DROP VAPOR DIFFUSION METHOD. RESERVOIR BUFFER CONTAINED 2.3 MOLAR AMMONIUM SULFATE AND 100 MILLIMOLAR CACODYLATE BUFFER PH 4.8. PROTEIN SOLUTION 40 MILLIGRAM PER MILLILITER WAS MIXED WITH AN EQUAL VOLUME OF RESERVOIR CONTAINING 10 MILLIMOLAR DI-NAG. CRYSTALS ABOUT 0.5 X 0.2 X 0.2 MILLIMETER IN SIZE WERE FORMED WITHIN 2-3 DAYS., VAPOR DIFFUSION, HANGING DROP

Crystal Properties
Matthews coefficient	Solvent content
2.45	49.72

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 109.174	α = 90
b = 99.416	β = 90
c = 86.556	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	100	IMAGE PLATE	MARRESEARCH	300 MM IMAGE PLATE	1999-11-12	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	1.9	10	96.9	0.055	10122.5			71983			20.95

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)
	1.9	1.97	94		0.217		2.9

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-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	R-FREE	PDB ENTRY 1C7S	1.9	10	71983	3626	96.9	0.191	0.246	RANDOM R VALUE (WORKING TEST SET) : 0.204	25.7

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_orthonormal_tor	25.1
p_staggered_tor	15.6
p_scangle_it	4.076
p_planar_tor	3.9
p_scbond_it	3.189
p_mcangle_it	2.333
p_mcbond_it	1.802
p_multtor_nbd	0.241
p_singtor_nbd	0.196
p_xyhbond_nbd	0.171
p_planar_d	0.038
p_angle_d	0.032
p_bond_d	0.017
p_angle_deg
p_hb_or_metal_coord
p_plane_restr
p_chiral_restr
p_xhyhbond_nbd
p_transverse_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6776
Nucleic Acid Atoms
Solvent Atoms	834
Heterogen Atoms	49

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
REFMAC	refinement
ARP	model building