2BBC

Structure of Cobalamin-complexed Bovine Transcobalamin in trigonal crystal form

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.5	293	28% PEG 8000, 0.2M magnesium acetate, 20% 2-methyl-2,4-pentadiol, 0.1M TRIS 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
3.97	69.03

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 99.57	α = 90
b = 99.57	β = 90
c = 128.631	γ = 120

Symmetry
Space Group	P 31 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	MARRESEARCH		2004-04-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ELETTRA BEAMLINE 5.2R	1.0	ELETTRA	5.2R

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	2.4	50	99	0.054	24.3	3.7	29190	29142			55.7

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	2.4	2.49	98.7	98.7	0.607	2.1	3.5	2875

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-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	Structure of Bovine Transcobalamin in monoclinic crystal form (PDB 2BB6).	2.4	20	27934	27934	1192	99.34	0.205	0.205	0.204	0.24	RANDOM	54.845

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]
0.64	0.32		0.64		-0.96

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	38.804
r_dihedral_angle_4_deg	21.175
r_dihedral_angle_3_deg	19.003
r_dihedral_angle_1_deg	6.987
r_scangle_it	3.59
r_scbond_it	2.239
r_mcangle_it	1.768
r_angle_refined_deg	1.543
r_mcbond_it	0.95
r_nbtor_refined	0.312
r_symmetry_vdw_refined	0.29
r_nbd_refined	0.225
r_symmetry_hbond_refined	0.173
r_xyhbond_nbd_refined	0.155
r_chiral_restr	0.098
r_bond_refined_d	0.013
r_gen_planes_refined	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3254
Nucleic Acid Atoms
Solvent Atoms	185
Heterogen Atoms	94

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
AMoRE	phasing