4CVW

Structure of the barley limit dextrinase-limit dextrinase inhibitor complex

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1				PROTEIN STOCK: PURIFIED 1:1 ENZYME:INHIBITOR COMPLEX (A280NM = 12.1) IN 50 MM MES PH 6.6, 250 MM NACL, 0.5 MM CACL2. RESERVOIR: 24% POLYETHYLENE GLYCOL (PEG) 8000 AND 0.05 M KH2PO4. 0.5 MICROLITRE 0.1 M NAD WAS ADDED TO THE DROPLET TO A CONCENTRATION OF 0.01 M.

Crystal Properties
Matthews coefficient	Solvent content
2.5	50.83

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 166.979	α = 90
b = 168.606	β = 90
c = 157.708	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	MARRESEARCH		2011-04-24	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID23-2		ESRF	ID23-2

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	2.67	157.76	99.4	0.18	8	4.9		60740

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	2.67	2.85	99.7		0.68	2.2	4.4

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	PDB ENTRIES 2Y4S AND 1B1U	2.67	157.76	57661	3078	96.3	0.257	0.255	0.293	RANDOM	24.8

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]
2.46			10.7		-13.15

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.791
r_dihedral_angle_3_deg	13.176
r_dihedral_angle_4_deg	12.929
r_dihedral_angle_1_deg	4.194
r_angle_refined_deg	0.847
r_scangle_it	0.444
r_mcangle_it	0.309
r_scbond_it	0.252
r_mcbond_it	0.167
r_chiral_restr	0.055
r_bond_refined_d	0.006
r_gen_planes_refined	0.003
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
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_mcbond_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	15044
Nucleic Acid Atoms
Solvent Atoms	98
Heterogen Atoms	4

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing