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- PDB-6ujc: Integrin alpha-v beta-8 in complex with the Fabs C6-RGD3 and 11D12v2 -

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Basic information

Entry
Database: PDB / ID: 6ujc
TitleIntegrin alpha-v beta-8 in complex with the Fabs C6-RGD3 and 11D12v2
Components
  • C6-RGD3 heavy chain Fab
  • C6-RGD3 light chain Fab
  • Integrin alpha-VIntegrin alpha V
  • Integrin beta-8
KeywordsSIGNALING PROTEIN/IMMUNE SYSTEM / glycoprotein / adhesion / signaling / SIGNALING PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


ganglioside metabolic process / Langerhans cell differentiation / integrin alphav-beta6 complex / integrin alphav-beta8 complex / hard palate development / transforming growth factor beta production / negative regulation of entry of bacterium into host cell / integrin alphav-beta5 complex / : / opsonin binding ...ganglioside metabolic process / Langerhans cell differentiation / integrin alphav-beta6 complex / integrin alphav-beta8 complex / hard palate development / transforming growth factor beta production / negative regulation of entry of bacterium into host cell / integrin alphav-beta5 complex / : / opsonin binding / integrin alphav-beta1 complex / Cross-presentation of particulate exogenous antigens (phagosomes) / extracellular matrix protein binding / Laminin interactions / placenta blood vessel development / integrin alphav-beta3 complex / negative regulation of lipoprotein metabolic process / entry into host cell by a symbiont-containing vacuole / alphav-beta3 integrin-PKCalpha complex / alphav-beta3 integrin-HMGB1 complex / negative regulation of lipid transport / negative regulation of low-density lipoprotein receptor activity / Elastic fibre formation / regulation of phagocytosis / alphav-beta3 integrin-IGF-1-IGF1R complex / transforming growth factor beta binding / filopodium membrane / positive regulation of small GTPase mediated signal transduction / extracellular matrix binding / apolipoprotein A-I-mediated signaling pathway / wound healing, spreading of epidermal cells / apoptotic cell clearance / cartilage development / heterotypic cell-cell adhesion / integrin complex / Molecules associated with elastic fibres / positive regulation of intracellular signal transduction / cell adhesion mediated by integrin / microvillus membrane / Syndecan interactions / negative chemotaxis / cell-substrate adhesion / endodermal cell differentiation / positive regulation of osteoblast proliferation / TGF-beta receptor signaling activates SMADs / PECAM1 interactions / lamellipodium membrane / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / fibronectin binding / positive regulation of cell adhesion / ECM proteoglycans / voltage-gated calcium channel activity / vasculogenesis / Integrin cell surface interactions / specific granule membrane / coreceptor activity / phagocytic vesicle / extrinsic apoptotic signaling pathway in absence of ligand / ERK1 and ERK2 cascade / substrate adhesion-dependent cell spreading / cell-matrix adhesion / transforming growth factor beta receptor signaling pathway / protein kinase C binding / Signal transduction by L1 / integrin-mediated signaling pathway / negative regulation of extrinsic apoptotic signaling pathway / calcium ion transmembrane transport / response to virus / cell-cell adhesion / ruffle membrane / VEGFA-VEGFR2 Pathway / positive regulation of angiogenesis / cell migration / integrin binding / virus receptor activity / positive regulation of cytosolic calcium ion concentration / angiogenesis / protease binding / cell adhesion / positive regulation of cell migration / immune response / symbiont entry into host cell / external side of plasma membrane / negative regulation of gene expression / focal adhesion / positive regulation of cell population proliferation / Neutrophil degranulation / positive regulation of gene expression / cell surface / extracellular exosome / membrane / metal ion binding / plasma membrane / cytosol
Similarity search - Function
Integrin domains. Chain A, domain 2 / Integrin alpha, N-terminal / : / Integrin alpha Ig-like domain 3 / Integrin beta subunit, VWA domain / Integrin beta subunit / Integrin beta N-terminal / Integrin beta chain VWA domain / Integrin plexin domain / Integrins beta chain cysteine-rich domain signature. ...Integrin domains. Chain A, domain 2 / Integrin alpha, N-terminal / : / Integrin alpha Ig-like domain 3 / Integrin beta subunit, VWA domain / Integrin beta subunit / Integrin beta N-terminal / Integrin beta chain VWA domain / Integrin plexin domain / Integrins beta chain cysteine-rich domain signature. / Integrin beta subunits (N-terminal portion of extracellular region) / Integrin alpha cytoplasmic region / EGF-like domain, extracellular / EGF-like domain / Integrin alpha-2 / Integrin alpha Ig-like domain 1 / von Willebrand factor, type A domain / : / Integrin alpha Ig-like domain 2 / Integrin alpha chain / Integrin alpha beta-propellor / Integrin alpha chain, C-terminal cytoplasmic region, conserved site / Integrins alpha chain signature. / FG-GAP repeat profile. / Integrin alpha (beta-propellor repeats). / FG-GAP repeat / FG-GAP repeat / Integrin domain superfamily / Integrin alpha, N-terminal / PSI domain / domain found in Plexins, Semaphorins and Integrins / 7 Propeller / Methylamine Dehydrogenase; Chain H / von Willebrand factor A-like domain superfamily / EGF-like domain signature 2. / EGF-like domain signature 1. / EGF-like domain / Immunoglobulin-like / Sandwich / Rossmann fold / 3-Layer(aba) Sandwich / Mainly Beta / Alpha Beta
Similarity search - Domain/homology
Integrin alpha-V / Integrin beta-8
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.56 Å
AuthorsCampbell, M.G. / Cormier, A. / Cheng, Y. / Nishimura, S.L.
Funding support United States, 7items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)U54HL119893 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R01HL113032 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R01HL134183 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R01GM098672 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)S10OD020054 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)S10OD021741 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)P41CA196276 United States
CitationJournal: Cell / Year: 2020
Title: Cryo-EM Reveals Integrin-Mediated TGF-β Activation without Release from Latent TGF-β.
Authors: Melody G Campbell / Anthony Cormier / Saburo Ito / Robert I Seed / Andrew J Bondesson / Jianlong Lou / James D Marks / Jody L Baron / Yifan Cheng / Stephen L Nishimura /
Abstract: Integrin αvβ8 binds with exquisite specificity to latent transforming growth factor-β (L-TGF-β). This binding is essential for activating L-TGF-β presented by a variety of cell types. ...Integrin αvβ8 binds with exquisite specificity to latent transforming growth factor-β (L-TGF-β). This binding is essential for activating L-TGF-β presented by a variety of cell types. Inhibiting αvβ8-mediated TGF-β activation blocks immunosuppressive regulatory T cell differentiation, which is a potential therapeutic strategy in cancer. Using cryo-electron microscopy, structure-guided mutagenesis, and cell-based assays, we reveal the binding interactions between the entire αvβ8 ectodomain and its intact natural ligand, L-TGF-β, as well as two different inhibitory antibody fragments to understand the structural underpinnings of αvβ8 binding specificity and TGF-β activation. Our studies reveal a mechanism of TGF-β activation where mature TGF-β signals within the confines of L-TGF-β and the release and diffusion of TGF-β are not required. The structural details of this mechanism provide a rational basis for therapeutic strategies to inhibit αvβ8-mediated L-TGF-β activation.
History
DepositionOct 2, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 5, 2020Provider: repository / Type: Initial release
Revision 1.1Feb 19, 2020Group: Database references / Category: citation / Item: _citation.journal_volume / _citation.page_first
Revision 2.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / em_entity_assembly / entity / pdbx_branch_scheme / pdbx_chem_comp_identifier / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / pdbx_struct_conn_angle / struct_asym / struct_conn / struct_site / struct_site_gen
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.type_symbol / _chem_comp.name / _em_entity_assembly.entity_id_list / _entity.formula_weight / _entity.pdbx_description / _entity.pdbx_number_of_molecules / _entity.src_method / _entity.type / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _struct_conn.conn_type_id / _struct_conn.id / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _struct_conn.pdbx_role / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation

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Structure visualization

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Assembly

Deposited unit
A: Integrin alpha-V
B: Integrin beta-8
E: C6-RGD3 heavy chain Fab
F: C6-RGD3 light chain Fab
hetero molecules


Theoretical massNumber of molelcules
Total (without water)244,92218
Polymers241,2644
Non-polymers3,65914
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area12710 Å2
ΔGint11 kcal/mol
Surface area49220 Å2

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Components

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Protein , 2 types, 2 molecules AB

#1: Protein Integrin alpha-V / Integrin alpha V / Vitronectin receptor / Vitronectin receptor subunit alpha


Mass: 112813.352 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ITGAV, MSK8, VNRA, VTNR / Cell line (production host): CHO lec 3.2.8.1 / Production host: Cricetulus griseus (Chinese hamster) / Tissue (production host): ovary / References: UniProt: P06756
#2: Protein Integrin beta-8


Mass: 81276.664 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ITGB8 / Cell line (production host): CHO lec 3.2.8.1 / Production host: Cricetulus griseus (Chinese hamster) / Tissue (production host): ovary / References: UniProt: P26012

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Antibody , 2 types, 2 molecules EF

#3: Antibody C6-RGD3 heavy chain Fab


Mass: 22785.475 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Cell line (production host): HEK293A / Organ (production host): kidney / Production host: Homo sapiens (human)
#4: Antibody C6-RGD3 light chain Fab


Mass: 24388.119 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Cell line (production host): HEK293A / Organ (production host): kidney / Production host: Homo sapiens (human)

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Sugars , 3 types, 8 molecules

#5: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1072.964 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#6: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
#8: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 2 types, 6 molecules

#7: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: Ca
#9: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg

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Details

Has ligand of interestN

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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
1Ternary complex of Integrin alpha-v beta-8 with Fab C6-RGD3 and Fab 11D12v2COMPLEX#1-#40MULTIPLE SOURCES
2alpha-v beta-8 integrinCOMPLEX#1-#21RECOMBINANT
3C6-RGD3 FabCOMPLEX#3-#41RECOMBINANT
411D12v2 FabCOMPLEX1RECOMBINANT
Molecular weightValue: 0.2 MDa / Experimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Homo sapiens (human)9606
23Mus musculus (house mouse)10090
34Mus musculus (house mouse)10090
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
12Cricetulus griseus (Chinese hamster)10029
23Homo sapiens (human)9606
34Homo sapiens (human)9606
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
VitrificationCryogen name: ETHANE

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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 FIELDBright-field microscopy
Image recordingElectron dose: 70 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.56 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 221159 / Symmetry type: POINT

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