2AAA | pdb_00002aaa

CALCIUM BINDING IN ALPHA-AMYLASES: AN X-RAY DIFFRACTION STUDY AT 2.1 ANGSTROMS RESOLUTION OF TWO ENZYMES FROM ASPERGILLUS

X-RAY DIFFRACTION

---

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2TAA

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	BATCH MODE			PEG 8000, PH 3.0-4.0

Crystal Properties
Matthews coefficient	Solvent content
2.6	52.61

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 81.1	α = 90
b = 98.3	β = 90
c = 138	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		AREA DETECTOR	SIEMENS-XENTRONICS			M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SRS BEAMLINE PX7.2		SRS	PX7.2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	2.119	69	30940	1650	97.62	0.1116	0.1313		Random selection	19.33

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]
0.929429118			-0.375499689		-0.55392943

RMS Deviations
Key	Refinement Restraint Deviation
s_dihedral_angle_6_deg	14.9692
s_dihedral_angle_3_deg	10.0648
s_dihedral_angle_1_deg	6.6411
s_dihedral_angle_2_deg	3.3146
s_angle_nonh_deg	1.9318
s_nbtor	0.2284
s_nbd	0.2057
s_symmetry_hbond_nbd	0.1977
s_symmetry_nbd	0.1838
s_hbond_nbd	0.1213
s_chiral_restr	0.0845
s_bond_nonh_d	0.0117
s_planes	0.0097

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3679
Nucleic Acid Atoms
Solvent Atoms	284
Heterogen Atoms	157

Software

Software
Software Name	Purpose
Servalcat	refinement
PDB-REDO	refinement