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- PDB-10nh: Crystal Structure of Apurinic endonuclease (APN1) from Babesia bovis -

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Basic information

Entry
Database: PDB / ID: 10nh
TitleCrystal Structure of Apurinic endonuclease (APN1) from Babesia bovis
ComponentsApurinic endonuclease (APN1)
KeywordsHYDROLASE / SSGCID / STRUCTURAL GENOMICS / SEATTLE STRUCTURAL GENOMICS CENTER FOR INFECTIOUS DISEASE / Apurinic endonuclease (APN1) / Babesia bovis
Function / homology
Function and homology information


phosphoric diester hydrolase activity / DNA-(apurinic or apyrimidinic site) endonuclease activity / base-excision repair / mitochondrion / DNA binding / zinc ion binding / nucleus
Similarity search - Function
AP endonucleases family 2 signature 1. / AP endonucleases family 2 signature 2. / AP endonuclease 2, zinc binding site / AP endonucleases family 2 profile. / AP endonuclease family 2 / AP endonuclease 2 / Xylose isomerase-like, TIM barrel domain / Xylose isomerase-like TIM barrel / Xylose isomerase-like superfamily
Similarity search - Domain/homology
HEXANE-1,6-DIOL / IMIDAZOLE / Apurinic endonuclease (APN1) family protein
Similarity search - Component
Biological speciesBabesia bovis T2Bo (eukaryote)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.65 Å
AuthorsSeattle Structural Genomics Center for Infectious Disease (SSGCID)
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)75N93022C00036 United States
National Institutes of Health/Office of the DirectorS10OD030394 United States
CitationJournal: To be published
Title: Crystal Structure of Apurinic endonuclease (APN1) from Babesia bovis
Authors: Lovell, S. / Cooper, A. / Battaile, K.P.
History
DepositionJan 28, 2026Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 11, 2026Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Apurinic endonuclease (APN1)
B: Apurinic endonuclease (APN1)
C: Apurinic endonuclease (APN1)
D: Apurinic endonuclease (APN1)
E: Apurinic endonuclease (APN1)
F: Apurinic endonuclease (APN1)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)219,41631
Polymers217,7066
Non-polymers1,71025
Water2,792155
1
A: Apurinic endonuclease (APN1)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)36,5505
Polymers36,2841
Non-polymers2654
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
2
B: Apurinic endonuclease (APN1)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)36,5505
Polymers36,2841
Non-polymers2654
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
3
C: Apurinic endonuclease (APN1)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)36,5505
Polymers36,2841
Non-polymers2654
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
4
D: Apurinic endonuclease (APN1)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)36,5505
Polymers36,2841
Non-polymers2654
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
5
E: Apurinic endonuclease (APN1)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)36,5505
Polymers36,2841
Non-polymers2654
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
6
F: Apurinic endonuclease (APN1)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)36,6686
Polymers36,2841
Non-polymers3835
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
Unit cell
Length a, b, c (Å)59.625, 93.089, 102.879
Angle α, β, γ (deg.)91.66, 91.18, 91.09
Int Tables number1
Space group name H-MP1

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Components

#1: Protein
Apurinic endonuclease (APN1)


Mass: 36284.277 Da / Num. of mol.: 6 / Fragment: P53-G367
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Babesia bovis T2Bo (eukaryote) / Gene: BBOV_III005900 / Plasmid: BaboA.18322.a.B2 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: S6B9Y3
#2: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 18 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical
ChemComp-IMD / IMIDAZOLE


Mass: 69.085 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C3H5N2
#4: Chemical ChemComp-HEZ / HEXANE-1,6-DIOL


Mass: 118.174 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H14O2
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 155 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
Has protein modificationN

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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: 2.62 Å3/Da / Density % sol: 53.07 %
Crystal growTemperature: 291 K / Method: vapor diffusion, sitting drop / pH: 6.5
Details: Morpheous D1: 20%(v/v) PEG 500 MME, 10%(w/v) PEG 20000, 100 mM Imidazole/MES, pH 6.5, 20 mM 1,6-Hexanediol, 20 mM 1-Butanol, 20 mM 1,2-Propanediol, 20 mM 2-Propanol, 20 mM 1,4-Butanediol and ...Details: Morpheous D1: 20%(v/v) PEG 500 MME, 10%(w/v) PEG 20000, 100 mM Imidazole/MES, pH 6.5, 20 mM 1,6-Hexanediol, 20 mM 1-Butanol, 20 mM 1,2-Propanediol, 20 mM 2-Propanol, 20 mM 1,4-Butanediol and 20 mM 1,3-Propanediol. BaboA.18322.a.B2.PW39407 at 19.1 mg/mL. 3 Zn ions per subunit. Positive density was observed between the Zn ions which were assigned as imidazole molecules from the crystallant. plate 19997 D1 drop 1, Puck: PSL-2115, Cryo: direct

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: NSLS-II / Beamline: 19-ID / Wavelength: 0.9786 Å
DetectorType: DECTRIS EIGER2 XE 9M / Detector: PIXEL / Date: Jun 14, 2025
RadiationMonochromator: Double Crystal Si 111 / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.9786 Å / Relative weight: 1
ReflectionResolution: 2.65→46.52 Å / Num. obs: 62383 / % possible obs: 97.1 % / Redundancy: 3.5 % / CC1/2: 0.976 / Rmerge(I) obs: 0.096 / Rpim(I) all: 0.061 / Rrim(I) all: 0.114 / Χ2: 1.01 / Net I/σ(I): 7.6 / Num. measured all: 218014
Reflection shellResolution: 2.65→2.72 Å / % possible obs: 97.7 % / Redundancy: 3.6 % / Rmerge(I) obs: 0.706 / Num. measured all: 17068 / Num. unique obs: 4698 / CC1/2: 0.736 / Rpim(I) all: 0.432 / Rrim(I) all: 0.83 / Χ2: 1.03 / Net I/σ(I) obs: 1.8

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Processing

Software
NameVersionClassification
PHENIX(2.0_5936: ???)refinement
Aimlessdata scaling
XDSdata reduction
PHASERphasing
PDB_EXTRACTdata extraction
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2.65→46.52 Å / SU ML: 0.43 / Cross valid method: FREE R-VALUE / σ(F): 1.96 / Phase error: 32.18 / Stereochemistry target values: ML
RfactorNum. reflection% reflection
Rfree0.2635 3210 5.15 %
Rwork0.2052 --
obs0.2083 62274 96.95 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.1 Å / Solvent model: FLAT BULK SOLVENT MODEL
Refinement stepCycle: LAST / Resolution: 2.65→46.52 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms14736 0 56 155 14947
Refine LS restraints
Refine-IDTypeDev idealNumber
X-RAY DIFFRACTIONf_bond_d0.00415101
X-RAY DIFFRACTIONf_angle_d0.63520364
X-RAY DIFFRACTIONf_dihedral_angle_d16.4635555
X-RAY DIFFRACTIONf_chiral_restr0.0422242
X-RAY DIFFRACTIONf_plane_restr0.0052652
LS refinement shell
Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRefine-ID% reflection obs (%)
2.65-2.690.35391760.29192567X-RAY DIFFRACTION97
2.69-2.730.34161420.28662621X-RAY DIFFRACTION98
2.73-2.780.34691290.27832578X-RAY DIFFRACTION98
2.78-2.820.38011440.28232573X-RAY DIFFRACTION98
2.82-2.880.42721380.30182603X-RAY DIFFRACTION98
2.88-2.930.37881270.29862593X-RAY DIFFRACTION97
2.93-2.990.3611390.27312565X-RAY DIFFRACTION97
2.99-3.060.33611260.26012582X-RAY DIFFRACTION98
3.06-3.130.31951380.24282645X-RAY DIFFRACTION98
3.13-3.20.33421180.24252525X-RAY DIFFRACTION97
3.2-3.290.31411700.23952517X-RAY DIFFRACTION96
3.29-3.390.29271530.24272563X-RAY DIFFRACTION97
3.39-3.50.31171220.23542600X-RAY DIFFRACTION97
3.5-3.620.27861490.20382534X-RAY DIFFRACTION97
3.62-3.770.2491510.19182551X-RAY DIFFRACTION97
3.77-3.940.25751550.18642568X-RAY DIFFRACTION97
3.94-4.150.23331500.17662554X-RAY DIFFRACTION97
4.15-4.410.27061130.16852560X-RAY DIFFRACTION96
4.41-4.750.18491120.15892595X-RAY DIFFRACTION97
4.75-5.220.20751720.15762514X-RAY DIFFRACTION96
5.22-5.980.2245900.18682609X-RAY DIFFRACTION96
5.98-7.530.25821250.19322532X-RAY DIFFRACTION96
7.53-46.520.20481710.1822515X-RAY DIFFRACTION96
Refinement TLS params.

Method: refined / Refine-ID: X-RAY DIFFRACTION

IDL112)L122)L132)L222)L232)L332)S11 (Å °)S12 (Å °)S13 (Å °)S21 (Å °)S22 (Å °)S23 (Å °)S31 (Å °)S32 (Å °)S33 (Å °)T112)T122)T132)T222)T232)T332)Origin x (Å)Origin y (Å)Origin z (Å)
12.05751.0177-0.30093.1372-0.34282.7372-0.08080.5149-0.1431-0.45910.0040.37390.0158-0.56750.08780.45020.0048-0.06920.7183-0.1020.5578-10.4197-5.4604-7.8092
25.33192.8549-0.94563.7893-0.5761.3966-0.04750.1147-0.016-0.492-0.0823-0.1275-0.1383-0.14340.13210.59780.1030.01730.5332-0.00410.48441.08029.7283-7.4761
38.4556-0.3266-1.76864.08190.16752.60130.3583-0.18210.3351-0.4327-0.2132-0.4487-0.45860.0785-0.14020.5231-0.00240.0470.41490.00490.45499.153613.1903-0.8759
41.74590.36360.06923.93850.44431.64340.1428-0.0103-0.2733-0.008-0.1631-0.1540.0614-0.0683-0.01190.3232-0.00410.02250.48070.0390.41043.0593-3.99556.3674
53.0564-1.0939-0.38661.381-1.03452.44980.16940.2118-0.8032-0.22710.06630.48960.5008-0.5410.03480.5549-0.15230.06610.9237-0.25410.858-11.714928.003838.0455
62.4879-0.4833-0.91.7334-0.88853.69170.10890.7095-0.2721-0.289-0.1288-0.0867-0.1406-0.7495-0.08360.5476-0.00750.05730.8976-0.070.5702-7.019645.216327.4803
77.07811.5863-0.98971.6986-0.41863.28640.13040.37450.114-0.0383-0.0303-0.5118-0.6127-0.1092-0.07130.65840.01710.1210.459-0.04580.72626.816756.684533.7127
82.5126-0.63960.46371.95040.09632.21780.08070.0838-0.1508-0.0029-0.0577-0.24110.0711-0.1182-0.02010.3767-0.05670.10760.5808-0.08560.57824.910941.658244.9297
92.33480.9957-0.44424.5633-0.27223.1539-0.3392-0.49650.15891.42150.7836-0.6156-0.06630.5213-0.3750.67960.2736-0.14661.17880.02910.7463-11.3105-12.667847.7523
101.4229-0.2625-0.67622.44930.95663.0352-0.0684-0.3886-0.32870.39980.4365-0.07780.37960.0562-0.27260.45510.1270.01550.69340.09320.6009-18.071-20.569529.6483
113.9166-1.32820.95452.9372-1.16925.05150.05410.1162-0.3-0.30840.26220.1560.1432-0.3322-0.23940.3282-0.09850.00520.53340.15150.5535-31.2628-12.152719.9559
122.63590.30540.85172.119-0.17964.4537-0.1457-0.27360.29180.21730.25590.0544-0.6435-0.029-0.12830.57020.06460.08380.56360.12270.4808-26.8401-1.636434.9055
133.331-0.5219-0.59411.93730.7454.0657-0.2321-0.2833-0.50670.10.1128-0.23640.55630.54230.09910.43730.04330.05910.48580.04650.6284-13.506428.609274.017
142.94-0.38311.42541.5276-0.1614.2243-0.09030.3882-0.2406-0.13560.05020.210.2312-0.06910.02630.4368-0.10350.120.50080.02140.6644-29.271234.896859.4954
152.36590.71191.04571.55490.05394.1547-0.2014-0.08210.06760.20870.04920.0812-0.2440.07130.17240.44650.04310.09290.39320.06290.4414-24.142245.052574.7819
166.97261.8774-1.1745.93170.05915.68850.08110.08780.50390.4672-0.14390.5164-0.76280.58260.01650.70890.04470.01270.45940.12120.4266-41.96374.775171.7453
171.2258-0.4324-0.63653.7497-0.53630.70920.0272-0.14620.06630.0981-0.0044-0.3866-0.08720.5554-0.10220.6054-0.0239-0.04771.01870.07460.475-27.0324-6.665269.2536
181.35380.1265-0.78444.21280.68190.9351-0.17430.13-0.3008-0.19340.1227-0.11880.38310.33270.02150.68590.1284-0.09730.84040.08940.4944-28.7405-21.954468.2479
193.0572-0.8639-0.92884.94390.14982.62860.10480.2501-0.3031-0.009-0.26090.65670.0215-0.31010.15270.6066-0.0542-0.00540.6195-0.02570.4071-47.4805-13.667770.135
204.31921.3330.76322.96632.27984.48420.2236-0.33660.7445-0.258-0.63580.7652-0.64260.34990.20410.77910.26580.08480.4442-0.02410.871414.176655.51857.4365
212.35770.31360.65583.0931.86782.6918-0.1433-0.13490.19940.13420.106-0.445-0.06580.7049-0.0120.559-0.0010.0080.55890.11490.468534.352249.90735.0879
224.7376-2.1389-0.75886.60032.16152.8042-0.1848-0.106-0.120.33280.2652-0.3840.55790.48910.14240.48250.09890.04950.59530.07180.55439.527436.45864.8773
232.38690.8678-0.02383.02380.92421.73560.0863-0.3074-0.78040.3237-0.2074-0.86640.28810.20490.04170.60880.1569-0.03350.5660.10560.562238.307526.48365.6856
243.40050.56140.27872.32770.2391.88340.0171-0.2654-0.19940.185-0.043-0.09120.43750.0850.0310.54940.06320.04640.48530.0550.384223.612727.86418.2973
257.0779-1.01741.2357.6109-0.68174.0312-0.00140.04850.32340.19820.09980.6049-0.3722-0.8121-0.14760.46730.00690.0560.47530.04560.41815.465142.32634.473
Refinement TLS group
IDRefine-IDRefine TLS-IDSelection details
1X-RAY DIFFRACTION1chain 'A' and (resid 55 through 140 )
2X-RAY DIFFRACTION2chain 'A' and (resid 141 through 183 )
3X-RAY DIFFRACTION3chain 'A' and (resid 184 through 218 )
4X-RAY DIFFRACTION4chain 'A' and (resid 219 through 367 )
5X-RAY DIFFRACTION5chain 'B' and (resid 55 through 82 )
6X-RAY DIFFRACTION6chain 'B' and (resid 83 through 141 )
7X-RAY DIFFRACTION7chain 'B' and (resid 142 through 217 )
8X-RAY DIFFRACTION8chain 'B' and (resid 218 through 367 )
9X-RAY DIFFRACTION9chain 'C' and (resid 56 through 82 )
10X-RAY DIFFRACTION10chain 'C' and (resid 83 through 140 )
11X-RAY DIFFRACTION11chain 'C' and (resid 141 through 218 )
12X-RAY DIFFRACTION12chain 'C' and (resid 219 through 366 )
13X-RAY DIFFRACTION13chain 'D' and (resid 55 through 140 )
14X-RAY DIFFRACTION14chain 'D' and (resid 141 through 239 )
15X-RAY DIFFRACTION15chain 'D' and (resid 240 through 367 )
16X-RAY DIFFRACTION16chain 'E' and (resid 56 through 112 )
17X-RAY DIFFRACTION17chain 'E' and (resid 113 through 162 )
18X-RAY DIFFRACTION18chain 'E' and (resid 163 through 239 )
19X-RAY DIFFRACTION19chain 'E' and (resid 240 through 367 )
20X-RAY DIFFRACTION20chain 'F' and (resid 55 through 82 )
21X-RAY DIFFRACTION21chain 'F' and (resid 83 through 140 )
22X-RAY DIFFRACTION22chain 'F' and (resid 141 through 182 )
23X-RAY DIFFRACTION23chain 'F' and (resid 183 through 218 )
24X-RAY DIFFRACTION24chain 'F' and (resid 219 through 309 )
25X-RAY DIFFRACTION25chain 'F' and (resid 310 through 366 )

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