1XEK

THE CRYSTAL STRUCTURES OF LYSOZYME AT VERY LOW LEVELS OF HYDRATION

X-RAY DIFFRACTION

---

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		88% low humidity structure

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		4.6		pH 4.6

Crystal Properties
Matthews coefficient	Solvent content
1.38	11.08

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 25.318	α = 90
b = 54.729	β = 111.15
c = 30.681	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	293	AREA DETECTOR	SIEMENS		1993-12-03

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1

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	2.3	10	86.02	0.041	29.55	1.87		3175

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	2.265	2.362	32.4		0.247	3.146	1.13

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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	A POSTERIORI	88% LOW HUMIDITY STRUCTURE	2.3	10	4	2705		73.29	0.197	0.304	RANDOM	29.12

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_transverse_tor	28.1
p_staggered_tor	26.3
p_scangle_it	4.7
p_scbond_it	3.9
p_planar_tor	2.5
p_mcangle_it	1.91
p_mcbond_it	1.103
p_multtor_nbd	0.37
p_xyhbond_nbd	0.287
p_singtor_nbd	0.239
p_chiral_restr	0.125
p_planar_d	0.048
p_angle_d	0.047
p_bond_d	0.012
p_plane_restr	0.012
p_angle_deg
p_hb_or_metal_coord
p_xhyhbond_nbd
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1001
Nucleic Acid Atoms
Solvent Atoms	46
Heterogen Atoms

Software

Software
Software Name	Purpose
XENGEN	data collection
XENGEN	data reduction
X-PLOR	model building
PROLSQ	refinement
X-PLOR	refinement
XENGEN	data scaling
X-PLOR	phasing