2RGQ

Crystal structure of a protein of unknown function with a cystatin-like fold (npun_r3134) from nostoc punctiforme pcc 73102 at 1.80 A resolution

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP		277	NANODROP, 0.05M KH2PO4, 20.0% PEG 8000, VAPOR DIFFUSION, SITTING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.34	47.38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 92.487	α = 90
b = 93.768	β = 90
c = 53.069	γ = 90

Symmetry
Space Group	P 21 21 2

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 315		2007-09-15	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 8.2.1	1.0000, 0.9796	ALS	8.2.1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	1.8	29.285	99.6	0.104	0.104	4.9	3.5		43329			16

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.8	1.85	99.1		0.571	0.571	1.3	3.4	3126

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-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	1.8	29.285	43295	2179	99.45	0.164	0.163	0.196	RANDOM	12.837

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]
-0.36			1.6		-1.24

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	29.499
r_dihedral_angle_4_deg	22.164
r_dihedral_angle_3_deg	10.784
r_dihedral_angle_1_deg	4.615
r_scangle_it	2.846
r_mcangle_it	2.207
r_scbond_it	1.953
r_angle_refined_deg	1.739
r_angle_other_deg	1.439
r_mcbond_it	1.388
r_mcbond_other	0.405
r_symmetry_hbond_refined	0.224
r_symmetry_vdw_refined	0.193
r_nbd_refined	0.192
r_symmetry_vdw_other	0.187
r_xyhbond_nbd_refined	0.179
r_nbtor_refined	0.169
r_nbd_other	0.168
r_chiral_restr	0.093
r_nbtor_other	0.083
r_bond_refined_d	0.017
r_gen_planes_refined	0.008
r_bond_other_d	0.005
r_gen_planes_other	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3143
Nucleic Acid Atoms
Solvent Atoms	439
Heterogen Atoms	38

Software

Software
Software Name	Purpose
REFMAC	refinement
PHENIX	refinement
SHELX	phasing
MolProbity	model building
SCALA	data scaling
PDB_EXTRACT	data extraction
ADSC	data collection
MOSFLM	data reduction
SHARP	phasing