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Open data
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Basic information
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Title | Integrin alpha-5 beta-1 in complex with MINT1526A Fab | ||||||||||||
![]() | primary EM map | ||||||||||||
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![]() | Integrin / Antibody Fab / Inhibitory / SIGNALING PROTEIN | ||||||||||||
Function / homology | ![]() integrin alpha8-beta1 complex / : / integrin alpha3-beta1 complex / integrin alpha5-beta1 complex / integrin alpha6-beta1 complex / integrin alpha7-beta1 complex / integrin alpha10-beta1 complex / integrin alpha11-beta1 complex / positive regulation of glutamate uptake involved in transmission of nerve impulse / myoblast fate specification ...integrin alpha8-beta1 complex / : / integrin alpha3-beta1 complex / integrin alpha5-beta1 complex / integrin alpha6-beta1 complex / integrin alpha7-beta1 complex / integrin alpha10-beta1 complex / integrin alpha11-beta1 complex / positive regulation of glutamate uptake involved in transmission of nerve impulse / myoblast fate specification / integrin alpha9-beta1 complex / regulation of collagen catabolic process / cardiac cell fate specification / integrin binding involved in cell-matrix adhesion / integrin alpha4-beta1 complex / cell-cell adhesion mediated by integrin / integrin alpha1-beta1 complex / collagen binding involved in cell-matrix adhesion / Localization of the PINCH-ILK-PARVIN complex to focal adhesions / integrin alpha2-beta1 complex / reactive gliosis / formation of radial glial scaffolds / Other semaphorin interactions / cerebellar climbing fiber to Purkinje cell synapse / Formation of the ureteric bud / positive regulation of fibroblast growth factor receptor signaling pathway / CD40 signaling pathway / Fibronectin matrix formation / calcium-independent cell-matrix adhesion / basement membrane organization / regulation of synapse pruning / integrin alphav-beta1 complex / myelin sheath abaxonal region / CHL1 interactions / RUNX2 regulates genes involved in cell migration / cardiac muscle cell myoblast differentiation / alphav-beta3 integrin-vitronectin complex / MET interacts with TNS proteins / Laminin interactions / leukocyte tethering or rolling / cardiac muscle cell differentiation / germ cell migration / cell projection organization / Platelet Adhesion to exposed collagen / vascular endothelial growth factor receptor 2 binding / myoblast fusion / positive regulation of vascular endothelial growth factor signaling pathway / Elastic fibre formation / mesodermal cell differentiation / cell-substrate junction assembly / platelet-derived growth factor receptor binding / axon extension / myoblast differentiation / cell migration involved in sprouting angiogenesis / Differentiation of Keratinocytes in Interfollicular Epidermis in Mammalian Skin / positive regulation of fibroblast migration / positive regulation of vascular endothelial growth factor receptor signaling pathway / positive regulation of cell-substrate adhesion / wound healing, spreading of epidermal cells / integrin complex / heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules / heterotypic cell-cell adhesion / regulation of spontaneous synaptic transmission / epidermal growth factor receptor binding / lamellipodium assembly / dendrite morphogenesis / sarcomere organization / Molecules associated with elastic fibres / MET activates PTK2 signaling / Basigin interactions / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / negative regulation of vasoconstriction / leukocyte cell-cell adhesion / cell adhesion mediated by integrin / positive regulation of wound healing / muscle organ development / Syndecan interactions / response to muscle activity / positive regulation of neuroblast proliferation / maintenance of blood-brain barrier / negative regulation of Rho protein signal transduction / positive regulation of sprouting angiogenesis / cell-substrate adhesion / endodermal cell differentiation / homophilic cell adhesion via plasma membrane adhesion molecules / TGF-beta receptor signaling activates SMADs / establishment of mitotic spindle orientation / cleavage furrow / fibronectin binding / negative regulation of anoikis / cellular response to low-density lipoprotein particle stimulus / RHOG GTPase cycle / glial cell projection / intercalated disc / neuroblast proliferation / negative regulation of neuron differentiation / RAC2 GTPase cycle / ECM proteoglycans / RAC3 GTPase cycle / Integrin cell surface interactions Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.7 Å | ||||||||||||
![]() | Nguyen A / Azumaya CM / Campbell MG | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural and functional characterization of integrin α5-targeting antibodies for anti-angiogenic therapy. Authors: Adam Nguyen / Joel B Heim / Gabriele Cordara / Matthew C Chan / Hedda Johannesen / Cristine Charlesworth / Ming Li / Caleigh M Azumaya / Benjamin Madden / Ute Krengel / Alexander Meves / Melody G Campbell / ![]() ![]() Abstract: Integrins are a large family of heterodimeric receptors important for cell adhesion and signaling. Integrin α5β1, also known as the fibronectin receptor, is a key mediator of angiogenesis and its ...Integrins are a large family of heterodimeric receptors important for cell adhesion and signaling. Integrin α5β1, also known as the fibronectin receptor, is a key mediator of angiogenesis and its dysregulation is associated with tumor proliferation, progression, and metastasis. Despite numerous efforts, α5β1-targeting therapeutics have been unsuccessful in large part due to efficacy and off-target effects. To mediate activation and signaling, integrins undergo drastic conformational changes. However, how therapeutics influence or are affected by integrin conformation remains incompletely characterized. Using cell biology, biophysics, and electron microscopy, we shed light on these relationships by characterizing two potentially therapeutic anti-α5β1 antibodies, BIIG2 and MINT1526A. We show that both antibodies bind α5β1 with nanomolar affinity and reduce angiogenesis . We demonstrate BIIG2 reduces tumor growth in two human xenograft mouse models and exhibits a strong specificity for connective tissue-resident fibroblasts and melanoma cells. Using electron microscopy, we map out the molecular interfaces mediating the integrin-antibody interactions and reveal that although both antibodies have overlapping epitopes and block fibronectin binding via steric hindrance, the effect on the conformational equilibrium is drastically different. While MINT1526A constricts α5β1's range of flexibility, BIIG2 binds without restricting the available conformational states. These mechanistic insights, coupled with the functional analysis, guide which aspects should be prioritized to avoid off-target effects or partial agonism in the design of future integrin-targeted therapeutics. | ||||||||||||
History |
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Structure visualization
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Downloads & links
-EMDB archive
Map data | ![]() | 84.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 25 KB 25 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 11.5 KB | Display | ![]() |
Images | ![]() | 33.4 KB | ||
Filedesc metadata | ![]() | 8.2 KB | ||
Others | ![]() ![]() ![]() | 84.2 MB 154.3 MB 154.3 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 9b9kMC ![]() 8r38C ![]() 9b9jC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | primary EM map | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.122 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Additional map: Additional EM map
File | emd_44387_additional_1.map | ||||||||||||
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Annotation | Additional EM map | ||||||||||||
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Density Histograms |
-Half map: primary EM map half B
File | emd_44387_half_map_1.map | ||||||||||||
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Annotation | primary EM map half B | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: primary EM map half A
File | emd_44387_half_map_2.map | ||||||||||||
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Annotation | primary EM map half A | ||||||||||||
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Density Histograms |
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Sample components
-Entire : Protein complex of integrin alpha-5 beta-1 with MINT1526A Fab
Entire | Name: Protein complex of integrin alpha-5 beta-1 with MINT1526A Fab |
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Components |
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-Supramolecule #1: Protein complex of integrin alpha-5 beta-1 with MINT1526A Fab
Supramolecule | Name: Protein complex of integrin alpha-5 beta-1 with MINT1526A Fab type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Integrin alpha-5 light chain
Macromolecule | Name: Integrin alpha-5 light chain / type: protein_or_peptide / ID: 1 Details: Integrin alpha-5 ectodomain with cleaved linker, HRV 3C cute site, acid coil and Strep-Tag II. Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 108.693734 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MGSRTPESPL HAVQLRWGPR RRPPLLPLLL LLLPPPPRVG GFNLDAEAPA VLSGPPGSFF GFSVEFYRPG TDGVSVLVGA PKANTSQPG VLQGGAVYLC PWGASPTQCT PIEFDSKGSR LLESSLSSSE GEEPVEYKSL QWFGATVRAH GSSILACAPL Y SWRTEKEP ...String: MGSRTPESPL HAVQLRWGPR RRPPLLPLLL LLLPPPPRVG GFNLDAEAPA VLSGPPGSFF GFSVEFYRPG TDGVSVLVGA PKANTSQPG VLQGGAVYLC PWGASPTQCT PIEFDSKGSR LLESSLSSSE GEEPVEYKSL QWFGATVRAH GSSILACAPL Y SWRTEKEP LSDPVGTCYL STDNFTRILE YAPCRSDFSW AAGQGYCQGG FSAEFTKTGR VVLGGPGSYF WQGQILSATQ EQ IAESYYP EYLINLVQGQ LQTRQASSIY DDSYLGYSVA VGEFSGDDTE DFVAGVPKGN LTYGYVTILN GSDIRSLYNF SGE QMASYF GYAVAATDVN GDGLDDLLVG APLLMDRTPD GRPQEVGRVY VYLQHPAGIE PTPTLTLTGH DEFGRFGSSL TPLG DLDQD GYNDVAIGAP FGGETQQGVV FVFPGGPGGL GSKPSQVLQP LWAASHTPDF FGSALRGGRD LDGNGYPDLI VGSFG VDKA VVYRGRPIVS ASASLTIFPA MFNPEERSCS LEGNPVACIN LSFCLNASGK HVADSIGFTV ELQLDWQKQK GGVRRA LFL ASRQATLTQT LLIQNGARED CREMKIYLRN ESEFRDKLSP IHIALNFSLD PQAPVDSHGL RPALHYQSKS RIEDKAQ IL LDCGEDNICV PDLQLEVFGE QNHVYLGDKN ALNLTFHAQN VGEGGAYEAE LRVTAPPEAE YSGLVRHPGN FSSLSCDY F AVNQSRLLVC DLGNPMKAGA SLWGGLRFTV PHLRDTKKTI QFDFQILSKN LNNSQSDVVS FRLSVEAQAQ VTLNGVSKP EAVLFPVSDW HPRDQPQKEE DLGPAVHHVY ELINQGPSSI SQGVLELSCP QALEGQQLLY VTRVTGLNCT TNHPINPKGL ELDPEGSLH HQQKREAPSR SSASSGPQIL KCPEAECFRL RCELGPLHQQ ESQSLQLHFR VWAKTFLQRE HQPFSLQCEA V YKALKMPY RILPRQLPQK ERQVATAVQW TKAEGSY UniProtKB: Integrin alpha-5 |
-Macromolecule #2: Integrin beta-1
Macromolecule | Name: Integrin beta-1 / type: protein_or_peptide / ID: 2 Details: Integrin beta-1 ectodomain with cleaved linker, HRV 3C cut site, base coil, and 6x His-tag. Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 80.653781 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MNLQPIFWIG LISSVCCVFA QTDENRCLKA NAKSCGECIQ AGPNCGWCTN STFLQEGMPT SARCDDLEAL KKKGCPPDDI ENPRGSKDI KKNKNVTNRS KGTAEKLKPE DITQIQPQQL VLRLRSGEPQ TFTLKFKRAE DYPIDLYYLM DLSYSMKDDL E NVKSLGTD ...String: MNLQPIFWIG LISSVCCVFA QTDENRCLKA NAKSCGECIQ AGPNCGWCTN STFLQEGMPT SARCDDLEAL KKKGCPPDDI ENPRGSKDI KKNKNVTNRS KGTAEKLKPE DITQIQPQQL VLRLRSGEPQ TFTLKFKRAE DYPIDLYYLM DLSYSMKDDL E NVKSLGTD LMNEMRRITS DFRIGFGSFV EKTVMPYIST TPAKLRNPCT SEQNCTSPFS YKNVLSLTNK GEVFNELVGK QR ISGNLDS PEGGFDAIMQ VAVCGSLIGW RNVTRLLVFS TDAGFHFAGD GKLGGIVLPN DGQCHLENNM YTMSHYYDYP SIA HLVQKL SENNIQTIFA VTEEFQPVYK ELKNLIPKSA VGTLSANSSN VIQLIIDAYN SLSSEVILEN GKLSEGVTIS YKSY CKNGV NGTGENGRKC SNISIGDEVQ FEISITSNKC PKKDSDSFKI RPLGFTEEVE VILQYICECE CQSEGIPESP KCHEG NGTF ECGACRCNEG RVGRHCECST DEVNSEDMDA YCRKENSSEI CSNNGECVCG QCVCRKRDNT NEIYSGKFCE CDNFNC DRS NGLICGGNGV CKCRVCECNP NYTGSACDCS LDTSTCEASN GQICNGRGIC ECGVCKCTDP KFQGQTCEMC QTCLGVC AE HKECVQCRAF NKGEKKDTCT QECSYFNITK VESRDKLPQP VQPDPVSHCK EKDVDDCWFY FTYSVNGNNE VMVHVVEN P ECPTGPD UniProtKB: Integrin beta-1 |
-Macromolecule #3: MINT1526A Fab Heavy Chain
Macromolecule | Name: MINT1526A Fab Heavy Chain / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: unidentified (others) |
Molecular weight | Theoretical: 13.398053 KDa |
Sequence | String: EVHLVESGGD LVQPGSSLKL SCAASGFTFS NRWLYWVKQA PGKGLEWVGG LKTKPNLYAT EYADSVKGRF TISRDDSKNS LYLQMNTLR VDDTALYYCT SLTGMRYFDY WGQGTMVTVS S |
-Macromolecule #4: MINT1526A Fab Light Chain
Macromolecule | Name: MINT1526A Fab Light Chain / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: unidentified (others) |
Molecular weight | Theoretical: 11.978021 KDa |
Sequence | String: LDVLTQSPSA SASLGNSVKL TCTLSSQHST YTIGWYQAGH PDKAPKYVMY LNSDGSHNKG DGLPDRFSGS SSGAHRYLSI SNIQPEDEA DYFCGSSYSS GYVFGSGTKV ELK |
-Macromolecule #9: CALCIUM ION
Macromolecule | Name: CALCIUM ION / type: ligand / ID: 9 / Number of copies: 7 / Formula: CA |
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Molecular weight | Theoretical: 40.078 Da |
-Macromolecule #10: 2-acetamido-2-deoxy-beta-D-glucopyranose
Macromolecule | Name: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 10 / Number of copies: 1 / Formula: NAG |
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Molecular weight | Theoretical: 221.208 Da |
Chemical component information | ![]() ChemComp-NAG: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.10 mg/mL | ||||||||||||
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Buffer | pH: 7.4 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | TFS GLACIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 3079 / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.4000000000000001 µm / Nominal magnification: 36000 |
Sample stage | Cooling holder cryogen: NITROGEN |
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Image processing
-Atomic model buiding 1
Initial model |
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Details | Initial local fitting was done using ChimeraX and then Phenix, ISOLDE and COOT for flexible fitting and modeling. | ||||||
Refinement | Space: REAL / Protocol: RIGID BODY FIT / Overall B value: 106.4 / Target criteria: Cross-correlation coefficient | ||||||
Output model | ![]() PDB-9b9k: |