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- PDB-38fv: CYP3A4 bound to ritonavir -

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Basic information

Entry
Database: PDB / ID: 38fv
TitleCYP3A4 bound to ritonavir
ComponentsCytochrome P450 3A4
KeywordsOXIDOREDUCTASE / inhibited complex / cytochrome p450
Function / homology
Function and homology information


quinine 3-monooxygenase / 1,8-cineole 2-exo-monooxygenase / albendazole monooxygenase (sulfoxide-forming) / quinine 3-monooxygenase activity / 1,8-cineole 2-exo-monooxygenase activity / 1-alpha,25-dihydroxyvitamin D3 23-hydroxylase activity / vitamin D 25-hydroxylase activity / vitamin D 24-hydroxylase activity / vitamin D catabolic process / retinoic acid 4-hydroxylase activity ...quinine 3-monooxygenase / 1,8-cineole 2-exo-monooxygenase / albendazole monooxygenase (sulfoxide-forming) / quinine 3-monooxygenase activity / 1,8-cineole 2-exo-monooxygenase activity / 1-alpha,25-dihydroxyvitamin D3 23-hydroxylase activity / vitamin D 25-hydroxylase activity / vitamin D 24-hydroxylase activity / vitamin D catabolic process / retinoic acid 4-hydroxylase activity / aflatoxin metabolic process / caffeine oxidase activity / estrogen 16-alpha-hydroxylase activity / lipid hydroxylation / anandamide 8,9 epoxidase activity / anandamide 11,12 epoxidase activity / anandamide 14,15 epoxidase activity / testosterone 6-beta-hydroxylase activity / alkaloid catabolic process / Aflatoxin activation and detoxification / Biosynthesis of maresin-like SPMs / monoterpenoid metabolic process / estrogen 2-hydroxylase activity / steroid catabolic process / oxidative demethylation / androgen metabolic process / vitamin D metabolic process / Atorvastatin ADME / steroid hydroxylase activity / Xenobiotics / retinoic acid metabolic process / Phase I - Functionalization of compounds / estrogen metabolic process / long-chain fatty acid biosynthetic process / retinol metabolic process / unspecific monooxygenase / Prednisone ADME / steroid metabolic process / Aspirin ADME / cholesterol metabolic process / intracellular membrane-bounded organelle / xenobiotic catabolic process / steroid binding / xenobiotic metabolic process / lipid metabolic process / monooxygenase activity / oxygen binding / oxidoreductase activity / iron ion binding / heme binding / endoplasmic reticulum membrane / enzyme binding / cytoplasm
Similarity search - Function
Cytochrome P450, E-class, group II / Cytochrome P450, E-class, CYP3A / : / Cytochrome P450, conserved site / Cytochrome P450 cysteine heme-iron ligand signature. / Cytochrome P450 / Cytochrome P450 superfamily / Cytochrome P450
Similarity search - Domain/homology
PROTOPORPHYRIN IX CONTAINING FE / RITONAVIR / Cytochrome P450 3A4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.55 Å
AuthorsOrta, A.K. / Fraser, J.S.
Funding support United States, 1items
OrganizationGrant numberCountry
Other government1AY1AX000035-01 United States
CitationJournal: To Be Published
Title: Structural analysis of CYP3A4 inhibition by Cryo-EM
Authors: Orta, A.K. / Fraser, J.S.
History
DepositionAug 24, 2026Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 30, 2026Provider: repository / Type: Initial release
Revision 1.0Sep 30, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Cytochrome P450 3A4
B: Cytochrome P450 3A4
C: Cytochrome P450 3A4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)171,2869
Polymers167,2733
Non-polymers4,0126
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Cytochrome P450 3A4 / 1 / 4-cineole 2-exo-monooxygenase / 8-cineole 2-exo-monooxygenase / Albendazole monooxygenase ...1 / 4-cineole 2-exo-monooxygenase / 8-cineole 2-exo-monooxygenase / Albendazole monooxygenase (sulfoxide-forming) / Albendazole sulfoxidase / CYPIIIA3 / CYPIIIA4 / Cholesterol 25-hydroxylase / Cytochrome P450 3A3 / Cytochrome P450 HLp / Cytochrome P450 NF-25 / Cytochrome P450-PCN1 / Nifedipine oxidase / Quinine 3-monooxygenase


Mass: 55757.812 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CYP3A4, CYP3A3 / Production host: Escherichia coli BL21(DE3) (bacteria)
References: UniProt: P08684, unspecific monooxygenase, 1,8-cineole 2-exo-monooxygenase, albendazole monooxygenase (sulfoxide-forming), quinine 3-monooxygenase
#2: Chemical ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C34H32FeN4O4 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-RIT / RITONAVIR / A-84538


Type: peptide-like / Mass: 720.944 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C37H48N6O5S2 / Feature type: SUBJECT OF INVESTIGATION / Comment: medication, antiretroviral*YM
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: homotrimeric complex of CYP3A4 bound to ritonavir / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.4
SpecimenConc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal magnification: 19000 X / Nominal defocus max: 1800 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.6.2particle selection
2PHENIX1.21.2_5419model refinement
3EPU3.9.1.8206image acquisition
13cryoSPARC4.6.23D reconstruction
CTF correctionType: PHASE FLIPPING ONLY
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 3.55 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 67638 / Symmetry type: POINT

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