3AXI

Crystal structure of isomaltase in complex with maltose

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.3	288	50mM HEPES, 0.2M lithium acetate, 21% (w/v) PEG 3350, 0.2M maltose , pH 7.3, VAPOR DIFFUSION, HANGING DROP, temperature 288K

Crystal Properties
Matthews coefficient	Solvent content
2.47	50.23

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 95.474	α = 90
b = 115.373	β = 91.07
c = 61.594	γ = 90

Symmetry
Space Group	C 1 2 1

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 210		2010-05-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	PHOTON FACTORY BEAMLINE AR-NW12A	1.0000	Photon Factory	AR-NW12A

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	1.4	18.83	92.9	0.062	18		131180	121866	2	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	1.4	1.42	94		0.12	10.5

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 ENTRY 3AJ7	1.4	18.83	115699	6163	92.72	0.17991	0.17915	0.19432	RANDOM	11.585

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
r_dihedral_angle_2_deg	34.194
r_dihedral_angle_4_deg	16.884
r_dihedral_angle_3_deg	11.304
r_dihedral_angle_1_deg	5.896
r_scangle_it	2.326
r_scbond_it	1.472
r_angle_refined_deg	1.427
r_mcangle_it	0.917
r_mcbond_it	0.559
r_nbtor_refined	0.314
r_nbd_refined	0.195
r_symmetry_vdw_refined	0.171
r_metal_ion_refined	0.116
r_chiral_restr	0.084
r_xyhbond_nbd_refined	0.072
r_symmetry_hbond_refined	0.071
r_bond_refined_d	0.007
r_gen_planes_refined	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4831
Nucleic Acid Atoms
Solvent Atoms	601
Heterogen Atoms	13

Software

Software
Software Name	Purpose
HKL-2000	data collection
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling