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- PDB-9d72: CryoEM structure of anti-MHC-I Fab M1/42 complex with H2-Dd -

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Basic information

Entry
Database: PDB / ID: 9d72
TitleCryoEM structure of anti-MHC-I Fab M1/42 complex with H2-Dd
Components
  • Beta-2-microglobulin
  • Fab M1/42 Heavy Chain
  • Fab M1/42 Light Chain
  • H-2 class I histocompatibility antigen, D-D alpha chain
  • Surface protein gp120
KeywordsANTITUMOR PROTEIN/Immune System / MHC-I / anti-mouse-mAb / H2-Dd / M1/42 / anti-MHC-I antibody / anti-tumor / cancer immunotherapy / ANTITUMOR PROTEIN / ANTITUMOR PROTEIN-Immune System complex
Function / homology
Function and homology information


Endosomal/Vacuolar pathway / DAP12 interactions / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / ER-Phagosome pathway / DAP12 signaling / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / regulation of membrane depolarization / Dectin-2 family / antigen processing and presentation of endogenous peptide antigen via MHC class I via ER pathway, TAP-dependent / cellular defense response ...Endosomal/Vacuolar pathway / DAP12 interactions / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / ER-Phagosome pathway / DAP12 signaling / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / regulation of membrane depolarization / Dectin-2 family / antigen processing and presentation of endogenous peptide antigen via MHC class I via ER pathway, TAP-dependent / cellular defense response / positive regulation of plasma membrane raft polarization / positive regulation of receptor clustering / Neutrophil degranulation / host cell endosome membrane / negative regulation of iron ion transport / lumenal side of endoplasmic reticulum membrane / T cell mediated cytotoxicity / cellular response to iron(III) ion / iron ion transport / negative regulation of forebrain neuron differentiation / antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent / peptide antigen assembly with MHC class I protein complex / transferrin transport / regulation of iron ion transport / regulation of erythrocyte differentiation / negative regulation of receptor-mediated endocytosis / HFE-transferrin receptor complex / response to molecule of bacterial origin / MHC class I peptide loading complex / cellular response to iron ion / positive regulation of T cell cytokine production / antigen processing and presentation of endogenous peptide antigen via MHC class I / MHC class I protein complex / peptide antigen assembly with MHC class II protein complex / negative regulation of neurogenesis / positive regulation of receptor-mediated endocytosis / cellular response to nicotine / MHC class II protein complex / positive regulation of T cell mediated cytotoxicity / multicellular organismal-level iron ion homeostasis / peptide antigen binding / antigen processing and presentation of exogenous peptide antigen via MHC class II / phagocytic vesicle membrane / positive regulation of immune response / positive regulation of T cell activation / negative regulation of epithelial cell proliferation / sensory perception of smell / positive regulation of cellular senescence / MHC class II protein complex binding / T cell differentiation in thymus / antimicrobial humoral immune response mediated by antimicrobial peptide / late endosome membrane / negative regulation of neuron projection development / antibacterial humoral response / protein refolding / cellular response to lipopolysaccharide / clathrin-dependent endocytosis of virus by host cell / amyloid fibril formation / protein homotetramerization / defense response to Gram-negative bacterium / intracellular iron ion homeostasis / learning or memory / defense response to Gram-positive bacterium / viral protein processing / fusion of virus membrane with host plasma membrane / external side of plasma membrane / innate immune response / lysosomal membrane / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / host cell plasma membrane / virion membrane / structural molecule activity / Golgi apparatus / protein homodimerization activity / extracellular space / identical protein binding / membrane / plasma membrane / cytosol
Similarity search - Function
Envelope glycoprotein Gp160 / Retroviral envelope protein / Retroviral envelope protein GP41-like / MHC class I, alpha chain, C-terminal / MHC_I C-terminus / Gp120 core superfamily / Envelope glycoprotein GP120 / Human immunodeficiency virus 1, envelope glycoprotein Gp120 / MHC class I alpha chain, alpha1 alpha2 domains / Class I Histocompatibility antigen, domains alpha 1 and 2 ...Envelope glycoprotein Gp160 / Retroviral envelope protein / Retroviral envelope protein GP41-like / MHC class I, alpha chain, C-terminal / MHC_I C-terminus / Gp120 core superfamily / Envelope glycoprotein GP120 / Human immunodeficiency virus 1, envelope glycoprotein Gp120 / MHC class I alpha chain, alpha1 alpha2 domains / Class I Histocompatibility antigen, domains alpha 1 and 2 / Beta-2-Microglobulin / : / MHC class I-like antigen recognition-like / MHC class I-like antigen recognition-like superfamily / MHC classes I/II-like antigen recognition protein / : / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
Beta-2-microglobulin / H-2 class I histocompatibility antigen, D-D alpha chain / Envelope glycoprotein gp160
Similarity search - Component
Biological speciesMus musculus (house mouse)
Rattus norvegicus (Norway rat)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.67 Å
AuthorsJiang, J. / Natarajan, K. / Margulies, D.H. / Lei, H. / Huang, R.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)Intramural United States
CitationJournal: Commun Biol / Year: 2026
Title: Structural mechanism of anti-MHC-I antibody blocking of inhibitory NK cell receptors in tumor immunity.
Authors: Jiansheng Jiang / Abir K Panda / Kannan Natarajan / Haotian Lei / Shikha Sharma / Lisa F Boyd / Reanne R Towler / Sruthi Chempati / Javeed Ahmad / Abraham J Morton / Zabrina C Lang / Yi Sun ...Authors: Jiansheng Jiang / Abir K Panda / Kannan Natarajan / Haotian Lei / Shikha Sharma / Lisa F Boyd / Reanne R Towler / Sruthi Chempati / Javeed Ahmad / Abraham J Morton / Zabrina C Lang / Yi Sun / Nikolaos Sgourakis / Martin Meier-Schellersheim / Rick K Huang / Ethan M Shevach / David H Margulies /
Abstract: Anti-major histocompatibility complex class I (MHC-I) mAbs can stimulate immune responses to tumors and infections by blocking suppressive signals delivered via various immune inhibitory receptors. ...Anti-major histocompatibility complex class I (MHC-I) mAbs can stimulate immune responses to tumors and infections by blocking suppressive signals delivered via various immune inhibitory receptors. To understand such functions, we determined the structure of a highly cross-reactive anti-human MHC-I mAb, B1.23.2, in complex with the MHC-I molecule HLA-B*44:05 by both cryo-electron microscopy (cryo-EM) and X-ray crystallography. Structural models determined by the two methods were essentially identical revealing that B1.23.2 binds a conserved region on the α2 helix that overlaps the killer immunoglobulin-like receptor (KIR) binding site. Structural comparison to KIR/HLA complexes reveals a mechanism by which B1.23.2 blocks inhibitory receptor interactions, leading to natural killer (NK) cell activation. B1.23.2 treatment of the human KLM-1 pancreatic cancer model in humanized (NSG-IL15) mice provides evidence of suppression of tumor growth. Such anti-MHC-I mAb that block inhibitory KIR/HLA interactions may prove useful for tumor immunotherapy.
History
DepositionAug 16, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 4, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: Beta-2-microglobulin
L: Fab M1/42 Light Chain
P: Surface protein gp120
A: H-2 class I histocompatibility antigen, D-D alpha chain
H: Fab M1/42 Heavy Chain


Theoretical massNumber of molelcules
Total (without water)91,7355
Polymers91,7355
Non-polymers00
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 Beta-2-microglobulin


Mass: 11529.153 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: B2m / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P01887
#2: Antibody Fab M1/42 Light Chain


Mass: 23555.971 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Plasmid: pCDNA3.1 / Cell (production host): Expi293F / Production host: Homo sapiens (human)
#3: Protein/peptide Surface protein gp120 / SU / Glycoprotein 120 / gp120


Mass: 1075.265 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others) / References: UniProt: P04582
#4: Protein H-2 class I histocompatibility antigen, D-D alpha chain / MHC-I H2-Dd A chain


Mass: 31819.361 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: H2-D1 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P01900
#5: Antibody Fab M1/42 Heavy Chain


Mass: 23754.752 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Plasmid: pCDNA3.1 / Cell (production host): Expi293F / Production host: Homo sapiens (human)
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: Complex of Anti mouse Fab M1/42 and MHC-I H2-Dd / Type: COMPLEX
Details: The sample was mixed 1:1 mole ratio of Fab and H2-Dd and purified. with concentration of 1.0 mg/ml
Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.090129 MDa / Experimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Homo sapiens (human) / Cell: Expi293F / Plasmid: pCDNA3.1
Buffer solutionpH: 8
Buffer componentConc.: 0.25 mg/ml / Name: TBS
SpecimenConc.: 1 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: EMS Lacey Carbon
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Calibrated magnification: 60096 X / Nominal defocus max: 2000 nm / Nominal defocus min: 700 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: BASIC
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 80 K / Temperature (min): 78 K
Image recordingAverage exposure time: 2.5 sec. / Electron dose: 54.2 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2993
Image scansSampling size: 5.001 µm / Movie frames/image: 40

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.4.1particle selection
2SerialEM3.8-4.0image acquisition
4cryoSPARC4.4.1CTF correction
7UCSF ChimeraX1.7.1model fitting
9PHENIX1.19.2-4158model refinement
12cryoSPARC4.4.1classification
13cryoSPARC4.4.13D reconstruction
CTF correctionDetails: PATCH CTF estimation / Type: NONE
Particle selectionNum. of particles selected: 735810
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.67 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 320842 / Algorithm: SIMULTANEOUS ITERATIVE (SIRT) / Num. of class averages: 41 / Symmetry type: POINT
Atomic model buildingB value: 146.2 / Protocol: RIGID BODY FIT / Space: REAL / Target criteria: CC
Atomic model buildingPDB-ID: 8TQ4

8tq4


Accession code: 8TQ4 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0026198
ELECTRON MICROSCOPYf_angle_d0.4898452
ELECTRON MICROSCOPYf_dihedral_angle_d11.0662173
ELECTRON MICROSCOPYf_chiral_restr0.041926
ELECTRON MICROSCOPYf_plane_restr0.0041090

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