Experiment: 1HW7

HSP33, HEAT SHOCK PROTEIN WITH REDOX-REGULATED CHAPERONE ACTIVITY

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		Structure phased by three-wavelength MAD experiment of AUCN-derived crystals and refined to 2.4 A.

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.8	298	Drops contained 2 microlitres of protein solution (10mg/ml in 20mM KCL, 40mM HEPES pH 7.5) supplemented with 2mM DTT and 0.3 mM ZnCl2 and 2 microlitres of precipitant (1.5 M ammonium sulfate, 10% dioxane, 0.1 M MES pH 6.8) and were equilibrated against 1ml of the same precipitant., VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
3.12	60.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 77.18	α = 90
b = 77.18	β = 90
c = 199.21	γ = 120

Symmetry
Space Group	P 65 2 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	CCD	ADSC QUANTUM 4	Bent conical Si-mirror (Rh coating)	2000-03-31	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 14-BM-C	1.0	APS	14-BM-C

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	2.2	30	99.7	0.048	45.7	23.9	18629	18629			32.2

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	2.2	2.28	99.9		0.323	14	6.9	1968

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-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	Free R	Structure phased by three-wavelength MAD experiment of AUCN-derived crystals and refined to 2.4 A.	2.2	30	33455	33455	1671	99.3	0.2295	0.2384	0.2567	0.2697	RANDOM	39.9

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
c_dihedral_angle_d	24.2
c_scangle_it	5.8
c_mcangle_it	4.3
c_scbond_it	4.1
c_mcbond_it	2.8
c_angle_deg	1.9
c_improper_angle_d	1.2
c_bond_d	0.015

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1789
Nucleic Acid Atoms
Solvent Atoms	144
Heterogen Atoms	33

Software

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