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- PDB-9lt3: Integrin alpha-v beta-3 in complex with Trimucrin -

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Basic information

Entry
Database: PDB / ID: 9lt3
TitleIntegrin alpha-v beta-3 in complex with Trimucrin
Components
  • Integrin alpha-V,Integrin alpha-v
  • Integrin beta-3
  • Zinc metalloproteinase/disintegrin PMMP-2
KeywordsMEMBRANE PROTEIN / disintegrin / complex
Function / homology
Function and homology information


integrin alphav-beta8 complex / integrin alphav-beta6 complex / 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 / regulation of serotonin uptake ...integrin alphav-beta8 complex / integrin alphav-beta6 complex / 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 / regulation of serotonin uptake / positive regulation of adenylate cyclase-inhibiting opioid receptor signaling pathway / tube development / alpha9-beta1 integrin-ADAM8 complex / regulation of trophoblast cell migration / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization / platelet alpha granule membrane / Laminin interactions / positive regulation of glomerular mesangial cell proliferation / integrin alphav-beta3 complex / negative regulation of lipoprotein metabolic process / alphav-beta3 integrin-PKCalpha complex / entry into host cell by a symbiont-containing vacuole / fibrinogen binding / positive regulation of small GTPase mediated signal transduction / alphav-beta3 integrin-HMGB1 complex / vascular endothelial growth factor receptor 2 binding / negative regulation of lipid transport / regulation of phagocytosis / positive regulation of vascular endothelial growth factor signaling pathway / Elastic fibre formation / cell-substrate junction assembly / alphav-beta3 integrin-IGF-1-IGF1R complex / positive regulation of bone resorption / transforming growth factor beta binding / Hydrolases; Acting on peptide bonds (peptidases); Metalloendopeptidases / platelet-derived growth factor receptor binding / mesodermal cell differentiation / glycinergic synapse / extracellular matrix binding / filopodium membrane / regulation of release of sequestered calcium ion into cytosol / positive regulation of vascular endothelial growth factor receptor signaling pathway / positive regulation of cell adhesion mediated by integrin / apolipoprotein A-I-mediated signaling pathway / negative regulation of low-density lipoprotein particle clearance / regulation of bone resorption / angiogenesis involved in wound healing / wound healing, spreading of epidermal cells / apoptotic cell clearance / positive regulation of fibroblast migration / integrin complex / cell adhesion mediated by integrin / smooth muscle cell migration / Molecules associated with elastic fibres / heterotypic cell-cell adhesion / positive regulation of smooth muscle cell migration / negative chemotaxis / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / Syndecan interactions / positive regulation of cell-matrix adhesion / p130Cas linkage to MAPK signaling for integrins / regulation of postsynaptic neurotransmitter receptor internalization / cellular response to insulin-like growth factor stimulus / positive regulation of osteoblast proliferation / protein disulfide isomerase activity / microvillus membrane / cell-substrate adhesion / platelet-derived growth factor receptor signaling pathway / PECAM1 interactions / GRB2:SOS provides linkage to MAPK signaling for Integrins / endodermal cell differentiation / TGF-beta receptor signaling activates SMADs / fibronectin binding / lamellipodium membrane / positive regulation of intracellular signal transduction / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / blood coagulation, fibrin clot formation / ECM proteoglycans / Integrin cell surface interactions / immunoglobulin complex / negative regulation of endothelial cell apoptotic process / vasculogenesis / positive regulation of T cell migration / specific granule membrane / coreceptor activity / phagocytic vesicle / ERK1 and ERK2 cascade / cellular response to platelet-derived growth factor stimulus / extrinsic apoptotic signaling pathway in absence of ligand / Integrin signaling / positive regulation of endothelial cell proliferation / positive regulation of substrate adhesion-dependent cell spreading / substrate adhesion-dependent cell spreading / embryo implantation / positive regulation of endothelial cell migration
Similarity search - Function
Disintegrin, conserved site / Disintegrins signature. / Peptidase M12B, propeptide / Reprolysin family propeptide / Reprolysin domain, adamalysin-type / Reprolysin (M12B) family zinc metalloprotease / Disintegrin / Disintegrin domain profile. / Homologues of snake disintegrins / Disintegrin domain ...Disintegrin, conserved site / Disintegrins signature. / Peptidase M12B, propeptide / Reprolysin family propeptide / Reprolysin domain, adamalysin-type / Reprolysin (M12B) family zinc metalloprotease / Disintegrin / Disintegrin domain profile. / Homologues of snake disintegrins / Disintegrin domain / Disintegrin domain superfamily / Peptidase M12B, ADAM/reprolysin / ADAM type metalloprotease domain profile. / Integrin beta, epidermal growth factor-like domain 1 / Integrin beta epidermal growth factor like domain 1 / : / Integrin alpha Ig-like domain 3 / Integrin beta subunit, cytoplasmic domain / Integrin beta tail domain / Integrin beta cytoplasmic domain / Integrin_b_cyt / : / Integrin EGF domain / EGF-like domain, extracellular / EGF-like domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily / Integrin_B_tail / Integrin alpha cytoplasmic region / : / Integrins beta chain EGF (I-EGF) domain profile. / Integrin beta subunit, VWA domain / Integrin beta subunit / Integrin beta N-terminal / Integrin beta chain VWA domain / Integrin plexin domain / Integrins beta chain EGF (I-EGF) domain signature. / Integrin beta subunits (N-terminal portion of extracellular region) / Integrin alpha-2 / Integrin alpha Ig-like domain 1 / Integrin alpha chain, C-terminal cytoplasmic region, conserved site / Integrins alpha chain signature. / Integrin alpha chain / Integrin alpha beta-propellor / : / Integrin alpha Ig-like domain 2 / 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 / Metallopeptidase, catalytic domain superfamily / : / von Willebrand factor A-like domain superfamily / EGF-like domain signature 1. / EGF-like domain signature 2. / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / Neutral zinc metallopeptidases, zinc-binding region signature. / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin subtype / Immunoglobulin / 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
Zinc metalloproteinase/disintegrin PMMP-2 / Integrin beta-3 / Integrin alpha-V / Uncharacterized protein DKFZp686C11235
Similarity search - Component
Biological speciesHomo sapiens (human)
Protobothrops mucrosquamatus (brown spotted pit viper)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.79 Å
AuthorsWang, Y.T. / Chuang, W.J.
Funding support Taiwan, 1items
OrganizationGrant numberCountry
National Science Council (NSC, Taiwan) Taiwan
CitationJournal: Commun Biol / Year: 2026
Title: Structural basis for the differential recognition of integrin αvβ3 by rhodostomin and trimucrin.
Authors: Ya-Ting Wang / Yao-Tsung Chang / Chun-Hao Huang / Ching-Ting Liau / Chiu-Yueh Chen / Woei-Jer Chuang /
Abstract: Rhodostomin (Rho) and Trimucrin (Tmu) are RGD-containing disintegrins that inhibit integrins more effectively than short RGD peptides. They differ in their linker, RGD loop, and C-terminal sequences. ...Rhodostomin (Rho) and Trimucrin (Tmu) are RGD-containing disintegrins that inhibit integrins more effectively than short RGD peptides. They differ in their linker, RGD loop, and C-terminal sequences. We determined the X-ray structure of Tmu and the cryo-EM structures of integrin αvβ3 in complex with both disintegrins. Structural analysis revealed subtle differences in binding, with both adopting a rigid backbone conformation and interacting with integrin through three cooperative binding sites. Besides the conserved RGD interface, Tmu features a cluster of basic residues in its linker, while Rho has distinct C-terminal interactions. Disintegrin binding stabilizes αvβ3 in an extended-open conformation, while the β3-Y110 residue is essential for maintaining the bent state without ligands. These findings enhance our understanding of integrin recognition and inform the development of integrin-targeted therapeutics for anti-angiogenic, anti-tumor, and anti-inflammatory applications.
History
DepositionFeb 5, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 18, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Integrin alpha-V,Integrin alpha-v
B: Integrin beta-3
C: Zinc metalloproteinase/disintegrin PMMP-2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)245,96920
Polymers241,4813
Non-polymers4,48817
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

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Protein , 3 types, 3 molecules ABC

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


Mass: 131412.844 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ITGAV, MSK8, VNRA, VTNR, DKFZp686C11235 / Production host: Cricetulus griseus (Chinese hamster) / References: UniProt: P06756, UniProt: Q6MZV7
#2: Protein Integrin beta-3 / Platelet membrane glycoprotein IIIa / GPIIIa


Mass: 102180.289 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ITGB3, GP3A, DKFZp686C11235 / Production host: Cricetulus griseus (Chinese hamster) / References: UniProt: P05106, UniProt: Q6MZV7
#3: Protein Zinc metalloproteinase/disintegrin PMMP-2


Mass: 7887.856 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Trimeresurus mucrosquamatus
Source: (gene. exp.) Protobothrops mucrosquamatus (brown spotted pit viper)
Production host: Komagataella pastoris (fungus) / References: UniProt: E9NW27

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Sugars , 4 types, 9 molecules

#4: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#5: 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.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam 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
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#6: Polysaccharide alpha-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D- ...alpha-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]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
DManpa1-4DManpb1-6[DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam 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]/1-1-2-3-2-3/a4-b1_b4-c1_c3-d1_c6-e1_e4-f1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][b-D-Manp]{[(4+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#8: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 3 / Source method: obtained synthetically / 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, 8 molecules

#7: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
#9: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION

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Details

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: integrin complex / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Cricetulus griseus (Chinese hamster)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1300 nm
Image recordingElectron dose: 45.6 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.4.1particle selection
2PHENIX1.20.1_4487:model refinement
13cryoSPARC4.4.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.79 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 481932 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0031783
ELECTRON MICROSCOPYf_angle_d0.6262410
ELECTRON MICROSCOPYf_dihedral_angle_d4.139254
ELECTRON MICROSCOPYf_chiral_restr0.042279
ELECTRON MICROSCOPYf_plane_restr0.004319

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