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- PDB-21tv: Cryo-EM structure of the TNF-alpha-Ozoralizumab (OZR)-HSA complex -

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Basic information

Entry
Database: PDB / ID: 21tv
TitleCryo-EM structure of the TNF-alpha-Ozoralizumab (OZR)-HSA complex
Components
  • Ozoralizumab (OZR)
  • Serum albumin
  • Tumor necrosis factor
KeywordsCYTOKINE / NANOBODY / VHH / TNF-alpha / HSA / Ozoralizumab / OZR
Function / homology
Function and homology information


response to Gram-negative bacterium / negative regulation of L-glutamate import across plasma membrane / positive regulation of chronic inflammatory response to antigenic stimulus / negative regulation of bile acid secretion / positive regulation of interleukin-33 production / positive regulation of neutrophil activation / negative regulation of branching involved in lung morphogenesis / positive regulation of fractalkine production / positive regulation of blood microparticle formation / : ...response to Gram-negative bacterium / negative regulation of L-glutamate import across plasma membrane / positive regulation of chronic inflammatory response to antigenic stimulus / negative regulation of bile acid secretion / positive regulation of interleukin-33 production / positive regulation of neutrophil activation / negative regulation of branching involved in lung morphogenesis / positive regulation of fractalkine production / positive regulation of blood microparticle formation / : / response to 3,3',5-triiodo-L-thyronine / death receptor agonist activity / positive regulation of translational initiation by iron / positive regulation of protein transport / positive regulation of vitamin D biosynthetic process / regulation of branching involved in salivary gland morphogenesis / regulation of endothelial cell apoptotic process / chronic inflammatory response to antigenic stimulus / negative regulation of protein-containing complex disassembly / response to macrophage colony-stimulating factor / positive regulation of humoral immune response mediated by circulating immunoglobulin / positive regulation of leukocyte adhesion to arterial endothelial cell / response to gold nanoparticle / negative regulation of myelination / positive regulation of JUN kinase activity / negative regulation of vascular wound healing / negative regulation of amyloid-beta clearance / negative regulation of cytokine production involved in immune response / reactive gliosis / positive regulation of hair follicle development / positive regulation of interleukin-18 production / inflammatory response to wounding / response to resveratrol / epithelial cell proliferation involved in salivary gland morphogenesis / positive regulation of action potential / response to quercetin / TNF signaling / toll-like receptor 3 signaling pathway / negative regulation of D-glucose import across plasma membrane / vascular endothelial growth factor production / embryonic digestive tract development / positive regulation of fever generation / positive regulation of calcineurin-NFAT signaling cascade / necroptotic signaling pathway / positive regulation of synoviocyte proliferation / leukocyte tethering or rolling / negative regulation of myoblast differentiation / bilirubin transport / positive regulation of mononuclear cell migration / response to fructose / positive regulation of hepatocyte proliferation / regulation of establishment of endothelial barrier / endothelial cell apoptotic process / negative regulation of oxidative phosphorylation / response to hydrogen sulfide / Ciprofloxacin ADME / positive regulation of protein-containing complex disassembly / exogenous protein binding / cellular response to calcium ion starvation / positive regulation of protein localization to cell surface / positive regulation of osteoclast differentiation / cellular response to toxic substance / macrophage activation involved in immune response / positive regulation of macrophage derived foam cell differentiation / tumor necrosis factor receptor binding / negative regulation of mitotic cell cycle / positive regulation of chemokine (C-X-C motif) ligand 2 production / positive regulation of cytokine production involved in inflammatory response / enterobactin binding / positive regulation of podosome assembly / regulation of fat cell differentiation / Heme biosynthesis / positive regulation of heterotypic cell-cell adhesion / positive regulation of programmed cell death / positive regulation of membrane protein ectodomain proteolysis / regulation of canonical NF-kappaB signal transduction / HDL remodeling / molecular carrier activity / response to L-glutamate / negative regulation of mitochondrial depolarization / positive regulation of leukocyte adhesion to vascular endothelial cell / negative regulation of systemic arterial blood pressure / TNFR1-induced proapoptotic signaling / positive regulation of extrinsic apoptotic signaling pathway / Prednisone ADME / TNFR1-mediated ceramide production / Heme degradation / mRNA stabilization / regulation of reactive oxygen species metabolic process / negative regulation of heart rate / positive regulation of DNA biosynthetic process / positive regulation of amyloid-beta formation / positive regulation of neuroinflammatory response / negative regulation of viral genome replication / positive regulation of immunoglobulin production / negative regulation of bicellular tight junction assembly / negative regulation of fat cell differentiation / Aspirin ADME / negative regulation of endothelial cell proliferation / antioxidant activity
Similarity search - Function
Tumour necrosis factor alpha / Tumour necrosis factor / Tumour necrosis factor, conserved site / Tumor necrosis factor (TNF) homology domain (THD) signature. / Tumour necrosis factor family. / TNF(Tumour Necrosis Factor) family / Tumour necrosis factor domain / Tumor necrosis factor (TNF) homology domain (THD) profile. / Tumour necrosis factor-like domain superfamily / Serum albumin/Alpha-fetoprotein/Afamin ...Tumour necrosis factor alpha / Tumour necrosis factor / Tumour necrosis factor, conserved site / Tumor necrosis factor (TNF) homology domain (THD) signature. / Tumour necrosis factor family. / TNF(Tumour Necrosis Factor) family / Tumour necrosis factor domain / Tumor necrosis factor (TNF) homology domain (THD) profile. / Tumour necrosis factor-like domain superfamily / Serum albumin/Alpha-fetoprotein/Afamin / ALB/AFP/VDB / Serum albumin, N-terminal / Serum albumin, conserved site / Serum albumin-like / Serum albumin family / Albumin domain signature. / Albumin domain profile. / serum albumin
Similarity search - Domain/homology
Tumor necrosis factor / Albumin
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 6.19 Å
AuthorsTanaka, Y. / Sato, K. / Mima, M. / Mishima-Tsumagari, C.
Funding support Japan, 1items
OrganizationGrant numberCountry
Other private Japan
CitationJournal: Biochem Biophys Res Commun / Year: 2026
Title: Cryo-EM elucidates the interaction mechanism of ozoralizumab, a humanized anti-TNFα NANOBODY® compound.
Authors: Masashi Mima / Kyohei Sato / Takeshi Yokoyama / Chiemi Mishima-Tsumagari / Tatsuya Ohnuki / Yoshikazu Tanaka / Kunihiko Iwamoto /
Abstract: Ozoralizumab (OZR) is a next-generation TNF inhibitor composed of two identical humanized anti-TNFα NANOBODY® molecules (TNF30s) recombinantly linked via one humanized anti-human serum albumin (HSA) ...Ozoralizumab (OZR) is a next-generation TNF inhibitor composed of two identical humanized anti-TNFα NANOBODY® molecules (TNF30s) recombinantly linked via one humanized anti-human serum albumin (HSA) NANOBODY® molecule (ALB8) and two peptide linkers. OZR is designed as a unique format to exert potent inhibitory effects against TNFα with long plasma half-life. However, the three-dimensional structure of OZR-TNFα-HSA complex has not yet been elucidated, and a complete understanding of its interaction mechanism with TNFα is yet to be gained. In this study, we successfully observed the formation of the OZR-TNFα-HSA ternary complex by single-particle cryo-electron microscopy. The single-particle analysis revealed that the two TNF30 molecules of OZR simultaneously bind bivalently to TNFα in a 1:1-bivalent binding mode, while the ALB8 molecule binds to HSA, forming a ternary complex. Thus, OZR exhibits a binding mode significantly different from that of other IgG-type TNFα inhibitors. Furthermore, surface plasmon resonance (SPR) analysis demonstrated that the 1:1-bivalent binding mode confers an exceptionally slow dissociation rate, thereby contributing to the potent TNFα-neutralizing activity of OZR. These findings not only lend support to the favorable clinical efficacy of OZR from a structural standpoint but also lay the foundation for the rational design and development of next-generation TNFα inhibitors with enhanced and sustained efficacy.
History
DepositionDec 26, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 29, 2026Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Ozoralizumab (OZR)
B: Tumor necrosis factor
C: Tumor necrosis factor
D: Tumor necrosis factor
E: Serum albumin


Theoretical massNumber of molelcules
Total (without water)157,3265
Polymers157,3265
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Ozoralizumab (OZR)


Mass: 38471.664 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Cricetulus griseus (Chinese hamster)
#2: Protein Tumor necrosis factor / Cachectin / TNF-alpha / Tumor necrosis factor ligand superfamily member 2 / TNF-a


Mass: 17427.709 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TNF, TNFA, TNFSF2 / Production host: Escherichia coli (E. coli) / References: UniProt: P01375
#3: Protein Serum albumin


Mass: 66571.219 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P02768
Has protein modificationN

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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

Component
IDNameTypeEntity IDParent-IDSource
1TNF-alpha-Ozoralizumab (OZR)-HSA complexCOMPLEXall0MULTIPLE SOURCES
2Ozoralizumab (OZR)COMPLEX#11RECOMBINANT
3Tumor necrosis factor-alpha (TNF-alpha)COMPLEX#21RECOMBINANT
4Human Serum Albumin (HSA)COMPLEX#31NATURAL
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
11Homo sapiens (human)9606
22Homo sapiens (human)9606
33Homo sapiens (human)9606
44Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
22Cricetulus griseus (Chinese hamster)10029
33Escherichia coli (E. coli)562
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: JEOL CRYO ARM 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2400 nm / Nominal defocus min: 700 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 6.19 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 41373 / Symmetry type: POINT
Atomic model buildingPDB-ID: 8Z8V

8z8v


Accession code: 8Z8V / Source name: PDB / Type: experimental model

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