4Z7O

Integrin alphaIIbbeta3 in complex with AGDV peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.224 

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This is version 2.0 of the entry. See complete history


Literature

beta-Subunit Binding Is Sufficient for Ligands to Open the Integrin alpha IIb beta 3 Headpiece.

Lin, F.Y.Zhu, J.Eng, E.T.Hudson, N.E.Springer, T.A.

(2016) J Biol Chem 291: 4537-4546

  • DOI: https://doi.org/10.1074/jbc.M115.705624
  • Primary Citation of Related Structures:  
    4Z7N, 4Z7O, 4Z7Q, 5HDB

  • PubMed Abstract: 

    The platelet integrin αIIbβ3 binds to a KQAGDV motif at the fibrinogen γ-chain C terminus and to RGD motifs present in loops in many extracellular matrix proteins. These ligands bind in a groove between the integrin α and β-subunits; the basic Lys or Arg side chain hydrogen bonds to the αIIb-subunit, and the acidic Asp side chain coordinates to a metal ion held by the β3-subunit. Ligand binding induces headpiece opening, with conformational change in the β-subunit. During this opening, RGD slides in the ligand-binding pocket toward αIIb, with movement of the βI-domain β1-α1 loop toward αIIb, enabling formation of direct, charged hydrogen bonds between the Arg side chain and αIIb. Here we test whether ligand interactions with β3 suffice for stable ligand binding and headpiece opening. We find that the AGDV tetrapeptide from KQAGDV binds to the αIIbβ3 headpiece with affinity comparable with the RGDSP peptide from fibronectin. AGDV induced complete headpiece opening in solution as shown by increase in hydrodynamic radius. Soaking of AGDV into closed αIIbβ3 headpiece crystals induced intermediate states similarly to RGDSP. AGDV has very little contact with the α-subunit. Furthermore, as measured by epitope exposure, AGDV, like the fibrinogen γ C-terminal peptide and RGD, caused integrin extension on the cell surface. Thus, pushing by the β3-subunit on Asp is sufficient for headpiece opening and ligand sliding, and no pulling by the αIIb subunit on Arg is required.


  • Organizational Affiliation

    From the Department of Biological Chemistry and Molecular Pharmacology, Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Integrin alpha-IIb
A, C
455Homo sapiensMutation(s): 0 
Gene Names: ITGA2BGP2BITGAB
UniProt & NIH Common Fund Data Resources
Find proteins for P08514 (Homo sapiens)
Explore P08514 
Go to UniProtKB:  P08514
PHAROS:  P08514
GTEx:  ENSG00000005961 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08514
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Integrin beta-3
B, D
469Homo sapiensMutation(s): 0 
Gene Names: ITGB3GP3A
UniProt & NIH Common Fund Data Resources
Find proteins for P05106 (Homo sapiens)
Explore P05106 
Go to UniProtKB:  P05106
PHAROS:  P05106
GTEx:  ENSG00000259207 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05106
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P05106-1
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Monoclonal antibody 10E5 Fab heavy chainE,
G [auth H]
221Mus musculusMutation(s): 0 
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Monoclonal antibody 10E5 Fab light chainF,
H [auth L]
214Mus musculusMutation(s): 0 
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  • Reference Sequence

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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Tetrapeptide ALA-GLY-ASP-VALI [auth G],
J [auth I]
4Homo sapiensMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 6
MoleculeChains Length2D Diagram Glycosylation3D Interactions
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-glucopyranoseK [auth J]5N-Glycosylation
Glycosylation Resources
GlyTouCan:  G22768VO
GlyCosmos:  G22768VO
GlyGen:  G22768VO
Entity ID: 7
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseL [auth K],
N
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 8
MoleculeChains Length2D Diagram Glycosylation3D Interactions
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
M
4N-Glycosylation
Glycosylation Resources
GlyTouCan:  G81315DD
GlyCosmos:  G81315DD
GlyGen:  G81315DD
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
GA [auth D],
W [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
SO4
Query on SO4

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HA [auth L],
O [auth A],
X [auth C]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
MN
Query on MN

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DA [auth D]
EA [auth D]
FA [auth D]
T [auth B]
U [auth B]
DA [auth D],
EA [auth D],
FA [auth D],
T [auth B],
U [auth B],
V [auth B]
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
CA
Query on CA

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AA [auth C]
BA [auth C]
CA [auth C]
P [auth A]
Q [auth A]
AA [auth C],
BA [auth C],
CA [auth C],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
Z [auth C]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL
Query on CL

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Y [auth C]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.224 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 259.918α = 90
b = 144.524β = 90
c = 104.65γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-27
    Type: Initial release
  • Version 1.1: 2016-03-09
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary