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- PDB-2ost: The structure of a bacterial homing endonuclease : I-Ssp6803I -

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Basic information

Entry
Database: PDB / ID: 2ost
TitleThe structure of a bacterial homing endonuclease : I-Ssp6803I
Components
  • (Synthetic DNA 29 MER) x 2
  • Putative endonuclease
Keywordshydrolase/DNA / protein-DNA complex / restriction enzyme fold / PD-(D/E)-XK motif / homing endonuclease / group I intron / hydrolase-DNA COMPLEX
Function / homology
Function and homology information


endonuclease activity / nucleic acid binding / metal ion binding
Similarity search - Function
PD(D/E)XK endonuclease / PD-(D/E)XK endonuclease / Trna Endonuclease; Chain: A, domain 1 - #10 / Trna Endonuclease; Chain: A, domain 1 / tRNA endonuclease-like domain superfamily / 3-Layer(aba) Sandwich / Alpha Beta
Similarity search - Domain/homology
DNA / DNA (> 10) / Endonuclease
Similarity search - Component
Biological speciesSynechocystis sp. (bacteria)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MAD / Resolution: 3.1 Å
AuthorsZhao, L. / Bonocora, R.P. / Shub, D.A. / Stoddard, B.L.
CitationJournal: Embo J. / Year: 2007
Title: The restriction fold turns to the dark side: a bacterial homing endonuclease with a PD-(D/E)-XK motif.
Authors: Zhao, L. / Bonocora, R.P. / Shub, D.A. / Stoddard, B.L.
History
DepositionFeb 6, 2007Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 20, 2007Provider: repository / Type: Initial release
Revision 1.1May 1, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Source and taxonomy / Version format compliance
Revision 1.3Oct 18, 2017Group: Refinement description / Category: software
Revision 1.4Oct 20, 2021Group: Database references / Derived calculations
Category: database_2 / pdbx_struct_conn_angle ...database_2 / pdbx_struct_conn_angle / struct_conn / struct_ref_seq_dif / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_conn_angle.ptnr1_auth_asym_id / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr3_auth_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.pdbx_dist_value / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id / _struct_ref_seq_dif.details / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id
Revision 1.5Feb 21, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond / struct_ncs_dom_lim
Item: _struct_ncs_dom_lim.beg_auth_comp_id / _struct_ncs_dom_lim.end_auth_comp_id

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
Y: Synthetic DNA 29 MER
Z: Synthetic DNA 29 MER
A: Putative endonuclease
B: Putative endonuclease
C: Putative endonuclease
D: Putative endonuclease
hetero molecules


Theoretical massNumber of molelcules
Total (without water)87,5328
Polymers87,4526
Non-polymers802
Water28816
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)143.777, 143.777, 319.179
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number97
Space group name H-MI422
Noncrystallographic symmetry (NCS)NCS domain:
IDEns-IDDetails
11A
21B
31C
41D
51A
61B
71C
81D

NCS domain segments:

Ens-ID: 1 / Refine code: 5

Dom-IDComponent-IDBeg auth comp-IDBeg label comp-IDEnd auth comp-IDEnd label comp-IDAuth asym-IDLabel asym-IDAuth seq-IDLabel seq-ID
11THRTHRARGARGAC3 - 704 - 71
21THRTHRARGARGBD3 - 704 - 71
31THRTHRARGARGCE3 - 704 - 71
41THRTHRARGARGDF3 - 674 - 68
52ASPASPLYSLYSAC87 - 14688 - 147
62ASPASPLYSLYSBD87 - 14688 - 147
72ASPASPLYSLYSCE87 - 14688 - 147
82ASPASPLYSLYSDF87 - 14688 - 147
DetailsThe structure of the I-SspI/DNA complex consists of one protein tetramer bound to a single DNA duplex; the crystallographic asymmetric unit contains one copy of this complex .

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Components

#1: DNA chain Synthetic DNA 29 MER


Mass: 8969.772 Da / Num. of mol.: 1 / Source method: obtained synthetically
Details: synthetic construct containing natural homing site of I-SspI6803I
#2: DNA chain Synthetic DNA 29 MER


Mass: 8862.685 Da / Num. of mol.: 1 / Source method: obtained synthetically
Details: synthetic construct containing natural homing site of I-SspI6803I
#3: Protein
Putative endonuclease


Mass: 17404.945 Da / Num. of mol.: 4 / Mutation: E11Q,F55K,L16M,L21M
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Synechocystis sp. (bacteria) / Strain: PCC 6803 / Plasmid: pET15b / Species (production host): Escherichia coli / Production host: Escherichia coli BL21 (bacteria) / Strain (production host): BL21 / References: UniProt: Q57253
#4: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Ca
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 16 / Source method: isolated from a natural source / Formula: H2O

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 4.67 Å3/Da / Density % sol: 73.69 %
Crystal growTemperature: 277 K / Method: vapor diffusion, hanging drop / pH: 6
Details: 15% to 20% MPD, 100 mM MES buffer, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 277K
Components of the solutions
IDNameCrystal-IDSol-ID
1MPD11
2MES11
3MPD12

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Data collection

Diffraction
IDMean temperature (K)Crystal-ID
11001
21001
31001
Diffraction source
SourceSiteBeamlineTypeIDWavelength (Å)Wavelength
SYNCHROTRONALS 5.0.210.979
SYNCHROTRONALS 5.0.220.965
ROTATING ANODERIGAKU RU20031.5418
Detector
TypeIDDetectorDate
ADSC QUANTUM 3151CCDJun 8, 2006
ADSC QUANTUM 3152CCDAug 25, 2006
RIGAKU RAXIS V3IMAGE PLATEMay 8, 2006
Radiation
IDMonochromatorProtocolMonochromatic (M) / Laue (L)Scattering typeWavelength-ID
1Double-crystal, Si(111) liquid N2 cooledSINGLE WAVELENGTHMx-ray1
2Double-crystal, Si(111) liquid N2 cooledSINGLE WAVELENGTHMx-ray1
3GRAPHITESINGLE WAVELENGTHMx-ray1
Radiation wavelength
IDWavelength (Å)Relative weight
10.9791
20.9651
31.54181
Reflection

D res low: 50 Å

Redundancy (%)IDAv σ(I) over netINumberRmerge(I) obsΧ2D res high (Å)Num. obs% possible obs
7.6110.72200380.0831.113.12889994
9.526.72431440.1521.173.325721100
Diffraction reflection shell
Highest resolution (Å)Lowest resolution (Å)% possible obs (%)IDRmerge(I) obsChi squaredRedundancy
8.45096.510.0410.9537.3
6.678.497.810.0551.1157.3
5.836.6798.710.081.2857.6
5.35.8398.510.0741.2597.7
4.925.399.410.0651.1937.7
4.634.9299.310.0671.2687.8
4.44.6399.510.0671.337.7
4.214.499.710.0781.2477.8
4.044.2199.710.091.1187.8
3.914.0499.910.111.0597.8
3.783.9199.810.1311.1267.8
3.683.7899.910.1431.1467.8
3.583.6899.910.1571.0757.7
3.493.5899.810.1891.0367.7
3.413.4998.410.1921.0057.5
3.343.4194.710.1841.0067.3
3.273.3487.910.19317.3
3.213.2778.210.2710.9317.3
3.153.2169.310.2980.9267.6
3.13.1561.410.3740.9077.6
8.945099.720.0381.1658.9
7.18.9410020.0511.0319.5
6.217.110020.0821.1129
5.646.2110020.1071.0039.3
5.245.6410020.1071.0479.4
4.935.2410020.1091.1769.6
4.684.9310020.1261.2099.7
4.484.6810020.1251.2459.7
4.314.4810020.141.1569.6
4.164.3199.820.1811.1249.6
4.034.1610020.2341.1289.6
3.914.0310020.31.1879.6
3.813.9199.920.3571.2989.5
3.723.8199.920.3881.1399.5
3.633.7210020.4191.4349.4
3.553.6310020.5591.1779.5
3.483.5599.920.5871.1759.5
3.423.4899.920.6161.2979.4
3.363.4210020.5971.1829.4
3.33.3610020.6281.1479.4
ReflectionResolution: 3.1→160.13 Å / Num. obs: 28899 / % possible obs: 94 % / Redundancy: 7.6 % / Rmerge(I) obs: 0.083 / Χ2: 1.111 / Net I/σ(I): 10.7
Reflection shell
Resolution (Å)Redundancy (%)Rmerge(I) obsNum. unique allΧ2Diffraction-ID% possible all
3.1-3.157.60.3749280.9071,2,361.4
3.15-3.217.60.29810290.9261,2,369.3
3.21-3.277.30.27111920.9311,2,378.2
3.27-3.347.30.193131911,2,387.9
3.34-3.417.30.18414201.0061,2,394.7
3.41-3.497.50.19214911.0051,2,398.4
3.49-3.587.70.18915311.0361,2,399.8
3.58-3.687.70.15715111.0751,2,399.9
3.68-3.787.80.14315291.1461,2,399.9
3.78-3.917.80.13114981.1261,2,399.8
3.91-4.047.80.1115231.0591,2,399.9
4.04-4.217.80.0915491.1181,2,399.7
4.21-4.47.80.07815151.2471,2,399.7
4.4-4.637.70.06715331.331,2,399.5
4.63-4.927.80.06715161.2681,2,399.3
4.92-5.37.70.06515291.1931,2,399.4
5.3-5.837.70.07415431.2591,2,398.5
5.83-6.677.60.0815431.2851,2,398.7
6.67-8.47.30.05515661.1151,2,397.8
8.4-507.30.04116340.9531,2,396.5

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Phasing

PhasingMethod: MAD
Phasing MAD set site
IDCartn x (Å)Cartn y (Å)Cartn z (Å)Atom type symbolB isoOccupancy
1-38.362-15.456-63.143SE71.250.74
2-38.299-49.252-50.778SE112.211.2
3-33.355-41.094-45.778SE93.141.07
4-19.776-34.049-39.32SE140.11.28
5-35.709-18.056-67.057SE83.370.59
6-28.713-40.155-46.549SE166.511.24
7-41.981-24.697-76.047SE90.541.12
8-32.936-7.045-58.308SE134.881.2
Phasing dmMethod: Solvent flattening

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Processing

Software
NameVersionClassificationNB
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing
DM6phasing
REFMACrefinement
PDB_EXTRACT2data extraction
ADSCQUANTUMdata collection
RefinementMethod to determine structure: MAD / Resolution: 3.1→160.13 Å / Cor.coef. Fo:Fc: 0.891 / Cor.coef. Fo:Fc free: 0.845 / SU B: 22.095 / SU ML: 0.402 / Cross valid method: THROUGHOUT / σ(F): 0 / ESU R: 1.024 / ESU R Free: 0.484 / Stereochemistry target values: MAXIMUM LIKELIHOOD
RfactorNum. reflection% reflectionSelection details
Rfree0.328 1459 5 %RANDOM
Rwork0.278 ---
obs0.281 28898 93.96 %-
Solvent computationIon probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.4 Å / Solvent model: MASK
Displacement parametersBiso mean: 83.07 Å2
Baniso -1Baniso -2Baniso -3
1-3.44 Å20 Å20 Å2
2--3.44 Å20 Å2
3----6.88 Å2
Refinement stepCycle: LAST / Resolution: 3.1→160.13 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms4540 1189 2 16 5747
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
X-RAY DIFFRACTIONr_bond_refined_d0.0070.0225974
X-RAY DIFFRACTIONr_angle_refined_deg1.8892.218317
X-RAY DIFFRACTIONr_dihedral_angle_1_deg5.4975561
X-RAY DIFFRACTIONr_dihedral_angle_2_deg36.07923.244225
X-RAY DIFFRACTIONr_dihedral_angle_3_deg19.41515803
X-RAY DIFFRACTIONr_dihedral_angle_4_deg14.3921539
X-RAY DIFFRACTIONr_chiral_restr0.2280.2909
X-RAY DIFFRACTIONr_gen_planes_refined0.0020.024140
X-RAY DIFFRACTIONr_nbd_refined0.1940.22776
X-RAY DIFFRACTIONr_nbtor_refined0.3020.23915
X-RAY DIFFRACTIONr_xyhbond_nbd_refined0.1460.2227
X-RAY DIFFRACTIONr_metal_ion_refined0.1110.26
X-RAY DIFFRACTIONr_symmetry_vdw_refined0.1480.252
X-RAY DIFFRACTIONr_symmetry_hbond_refined0.140.21
X-RAY DIFFRACTIONr_mcbond_it0.3741.52857
X-RAY DIFFRACTIONr_mcangle_it0.68224492
X-RAY DIFFRACTIONr_scbond_it0.60933964
X-RAY DIFFRACTIONr_scangle_it1.1584.53825
Refine LS restraints NCS

Ens-ID: 1 / Refine-ID: X-RAY DIFFRACTION

Dom-IDAuth asym-IDNumberTypeRms dev position (Å)Weight position
1A500MEDIUM POSITIONAL0.590.5
2B500MEDIUM POSITIONAL0.420.5
3C500MEDIUM POSITIONAL0.580.5
4D500MEDIUM POSITIONAL0.430.5
1A471LOOSE POSITIONAL1.325
2B471LOOSE POSITIONAL1.085
3C471LOOSE POSITIONAL1.235
4D471LOOSE POSITIONAL1.085
1A500MEDIUM THERMAL0.552
2B500MEDIUM THERMAL0.362
3C500MEDIUM THERMAL0.372
4D500MEDIUM THERMAL0.452
1A471LOOSE THERMAL1.3110
2B471LOOSE THERMAL0.9510
3C471LOOSE THERMAL0.9710
4D471LOOSE THERMAL1.1210
LS refinement shellResolution: 3.1→3.183 Å / Total num. of bins used: 20
RfactorNum. reflection% reflection
Rfree0.401 78 -
Rwork0.328 1305 -
obs-1383 62.58 %

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