3K4Z

Crystal Structure of the Cellulosomal CBM4 from Clostridium thermocellum Cellulase CbhA

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1RQ5	PDB entries 1RQ5 and 1GU3
experimental model	PDB	1GU3	PDB entries 1RQ5 and 1GU3

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.5	298	30% PEG 4000, 0.2 M magnesium chloride hexahydrate, Tris hydrochloride, pH 8.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.45	49.78

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 60.578	α = 90
b = 94.315	β = 90
c = 113.487	γ = 90

Symmetry
Space Group	C 2 2 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	CCD	Bruker Platinum 135		2009-05-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	BRUKER AXS MICROSTAR	1.5418

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	2.11	50	99.7	0.0991	10.83	4.1	19168	19105

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2.11	2.21	99.1		0.4193	2.51	2.84	2461

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entries 1RQ5 and 1GU3	2.11	25.04	2.33	18089	18089	978	99.6	0.16391	0.16391	0.16075	0.22447	RANDOM	11.203

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]
			0.24		-0.23

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.787
r_dihedral_angle_4_deg	19.35
r_dihedral_angle_3_deg	14.526
r_dihedral_angle_1_deg	7.218
r_scangle_it	3.913
r_scbond_it	2.699
r_angle_refined_deg	1.79
r_mcangle_it	1.564
r_mcbond_it	0.949
r_angle_other_deg	0.927
r_mcbond_other	0.296
r_chiral_restr	0.107
r_bond_refined_d	0.021
r_gen_planes_refined	0.009
r_gen_planes_other	0.002
r_bond_other_d	0.001
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2210
Nucleic Acid Atoms
Solvent Atoms	271
Heterogen Atoms	48

Software

Software
Software Name	Purpose
MrBUMP	phasing
REFMAC	refinement