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- PDB-13th: Orf9b homodimer in complex with fragment ZINC000018154848 -

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Basic information

Entry
Database: PDB / ID: 13th
TitleOrf9b homodimer in complex with fragment ZINC000018154848
ComponentsORF9b protein
KeywordsVIRAL PROTEIN / Homodimer / SARS-CoV-2 / Innate immunity
Function / homology
Function and homology information


Translation of Accessory Proteins / negative regulation of defense response to virus / positive regulation of autophagosome assembly / negative regulation of mitochondrial fission / host cell mitochondrion / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity / protein sequestering activity / DDX58/IFIH1-mediated induction of interferon-alpha/beta / mitochondrial membrane / symbiont-mediated suppression of host type I interferon-mediated signaling pathway ...Translation of Accessory Proteins / negative regulation of defense response to virus / positive regulation of autophagosome assembly / negative regulation of mitochondrial fission / host cell mitochondrion / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity / protein sequestering activity / DDX58/IFIH1-mediated induction of interferon-alpha/beta / mitochondrial membrane / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / SARS-CoV-2 activates/modulates innate and adaptive immune responses / identical protein binding
Similarity search - Function
Protein 9b, Betacoronavirus / Protein 9b, SARS-CoV / Betacoronavirus lipid binding protein / Sarbecovirus 9b domain profile.
Similarity search - Domain/homology
4-HYDROXY-2H-CHROMEN-2-ONE / DECANE / ORF9b protein
Similarity search - Component
Biological speciesSevere acute respiratory syndrome coronavirus 2
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.2 Å
AuthorsSan Felipe, C.J. / Fraser, J.S.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)U19AI171110 United States
CitationJournal: to be published
Title: Orf9b homodimer in complex with fragments
Authors: San Felipe, C.J. / Fraser, J.S.
History
DepositionOct 19, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 26, 2026Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: ORF9b protein
B: ORF9b protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)22,0005
Polymers21,6172
Non-polymers3833
Water45025
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area4350 Å2
ΔGint-12 kcal/mol
Surface area9360 Å2
MethodPISA
Unit cell
Length a, b, c (Å)35.853, 65.125, 73.694
Angle α, β, γ (deg.)90.000, 90.000, 90.000
Int Tables number19
Space group name H-MP212121
Space group name HallP2ac2ab
Symmetry operation#1: x,y,z
#2: x+1/2,-y+1/2,-z
#3: -x,y+1/2,-z+1/2
#4: -x+1/2,-y,z+1/2

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Components

#1: Protein ORF9b protein / ORF9b / Accessory protein 9b / ORF-9b / Protein 9b


Mass: 10808.636 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Severe acute respiratory syndrome coronavirus 2
Gene: 9b / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0DTD2
#2: Chemical ChemComp-DMS / DIMETHYL SULFOXIDE


Mass: 78.133 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C2H6OS / Comment: DMSO, precipitant*YM
#3: Chemical ChemComp-D10 / DECANE


Mass: 142.282 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H22
#4: Chemical ChemComp-4HC / 4-HYDROXY-2H-CHROMEN-2-ONE / 4-HYDROXY-1-BENZOPYRAN-2-ONE / 4-HYDROXYCOUMARIN


Mass: 162.142 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C9H6O3 / Feature type: SUBJECT OF INVESTIGATION
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 25 / 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: 1.99 Å3/Da / Density % sol: 38.19 %
Crystal growTemperature: 291 K / Method: vapor diffusion, sitting drop / pH: 6.5
Details: 10% PEG3350, 10% PEG1000, 10% MPD, 0.15M Ethylene Glycol, 0.1M MES pH 6.5, 0.1M Imidazole pH 6.5

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: ALS / Beamline: 8.3.1 / Wavelength: 1.116 Å
DetectorType: DECTRIS PILATUS3 S 6M / Detector: PIXEL / Date: Oct 21, 2023
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.116 Å / Relative weight: 1
ReflectionResolution: 2.2→48.8 Å / Num. obs: 9233 / % possible obs: 99.9 % / Redundancy: 6.3 % / Biso Wilson estimate: 43.64 Å2 / CC1/2: 0.997 / Rmerge(I) obs: 0.155 / Rpim(I) all: 0.067 / Rrim(I) all: 0.17 / Χ2: 0.97 / Net I/σ(I): 8.7 / Num. measured all: 58442
Reflection shellResolution: 2.2→2.27 Å / % possible obs: 99.1 % / Redundancy: 6.2 % / Rmerge(I) obs: 1.516 / Num. measured all: 4779 / Num. unique obs: 772 / CC1/2: 0.398 / Rpim(I) all: 0.659 / Rrim(I) all: 1.656 / Χ2: 0.85 / Net I/σ(I) obs: 1.1

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Processing

Software
NameVersionClassificationNB
PHENIX1.21.1_5286refinement
Aimlessdata scaling
XDSdata reduction
PHASERphasing
EM softwareName: PHENIX / Version: 1.21.1_5286 / Category: model refinement
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2.2→36.85 Å / SU ML: 0.3427 / Cross valid method: FREE R-VALUE / σ(F): 1.35 / Phase error: 34.9743
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
RfactorNum. reflection% reflection
Rfree0.2912 719 7.82 %
Rwork0.2508 8470 -
obs0.254 9189 99.84 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.1 Å / Solvent model: FLAT BULK SOLVENT MODEL
Displacement parametersBiso mean: 59.89 Å2
Refinement stepCycle: LAST / Resolution: 2.2→36.85 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1265 0 26 25 1316
Refine LS restraints
Refine-IDTypeDev idealNumber
X-RAY DIFFRACTIONf_bond_d0.00711309
X-RAY DIFFRACTIONf_angle_d0.75851774
X-RAY DIFFRACTIONf_chiral_restr0.0517224
X-RAY DIFFRACTIONf_plane_restr0.0053218
X-RAY DIFFRACTIONf_dihedral_angle_d17.0345511
LS refinement shell
Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRefine-ID% reflection obs (%)
2.2-2.370.39171390.37781654X-RAY DIFFRACTION99.56
2.37-2.610.35791410.32021658X-RAY DIFFRACTION99.94
2.61-2.990.30181420.27051680X-RAY DIFFRACTION99.78
2.99-3.760.29841450.23271683X-RAY DIFFRACTION99.95
3.77-36.850.261520.22451795X-RAY DIFFRACTION99.95
Refinement TLS params.Method: refined / Origin x: 8.15862525415 Å / Origin y: -0.959371780592 Å / Origin z: -4.2533984924 Å
111213212223313233
T0.266302430951 Å20.0195674413207 Å2-0.0151897029474 Å2-0.30297347809 Å20.0872247853737 Å2--0.273096376177 Å2
L2.28127235656 °2-1.07643404366 °2-1.29873044981 °2-3.71611509905 °22.91336672841 °2--4.53708715782 °2
S-0.187219701146 Å °-0.0781599005285 Å °0.0797209326573 Å °0.219536481368 Å °0.0530887503938 Å °0.133416211686 Å °0.477758599686 Å °0.0256885704066 Å °0.120609380954 Å °
Refinement TLS groupSelection details: all

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