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Binding of autotaxin to integrins localizes lysophosphatidic acid production to platelets and mammalian cells.

Autotaxin (ATX) is a secreted lysophospholipase D that generates the bioactive lipid mediator lysophosphatidic acid (LPA). We and others have reported that ATX binds to integrins, but the function of ATX-integrin interactions is unknown. The recently reported crystal structure of ATX suggests a role... Full description

Journal Title: The Journal of biological chemistry October 7, 2011, Vol.286(40), pp.34654-34663
Main Author: Fulkerson, Zachary
Other Authors: Wu, Tao , Sunkara, Manjula , Kooi, Craig Vander , Morris, Andrew J , Smyth, Susan S
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1083-351X ; DOI: 10.1074/jbc.M111.276725
Link: http://search.proquest.com/docview/896221069/?pq-origsite=primo
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title: Binding of autotaxin to integrins localizes lysophosphatidic acid production to platelets and mammalian cells.
format: Article
creator:
  • Fulkerson, Zachary
  • Wu, Tao
  • Sunkara, Manjula
  • Kooi, Craig Vander
  • Morris, Andrew J
  • Smyth, Susan S
subjects:
  • Animals–Metabolism
  • Blood Platelets–Metabolism
  • Cho Cells–Chemistry
  • Catalysis–Metabolism
  • Cell Adhesion–Metabolism
  • Cell Membrane–Chemistry
  • Cricetinae–Metabolism
  • Cricetulus–Metabolism
  • Humans–Metabolism
  • Integrins–Metabolism
  • Lysophospholipids–Metabolism
  • Phosphoric Diester Hydrolases–Metabolism
  • Platelet Aggregation–Metabolism
  • Platelet Glycoprotein Gpiib-Iiia Complex–Metabolism
  • Protein Structure, Tertiary–Metabolism
  • Signal Transduction–Metabolism
  • Integrins
  • Lysophospholipids
  • Platelet Glycoprotein Gpiib-Iiia Complex
  • Phosphoric Diester Hydrolases
ispartof: The Journal of biological chemistry, October 7, 2011, Vol.286(40), pp.34654-34663
description: Autotaxin (ATX) is a secreted lysophospholipase D that generates the bioactive lipid mediator lysophosphatidic acid (LPA). We and others have reported that ATX binds to integrins, but the function of ATX-integrin interactions is unknown. The recently reported crystal structure of ATX suggests a role for the solvent-exposed surface of the N-terminal tandem somatomedin B-like domains in binding to platelet integrin αIIbβ(3). The opposite face of the somatomedin B-like domain interacts with the catalytic phosphodiesterase (PDE) domain to form a hydrophobic channel through which lysophospholipid substrates enter and leave the active site. Based on this structure, we hypothesize that integrin-bound ATX can access cell surface substrates and deliver LPA to cell surface receptors. To test this hypothesis, we investigated the integrin selectivity and signaling pathways that promote ATX binding to platelets. We report that both platelet β1 and β3 integrins interact in an activation-dependent manner with ATX via the SMB2 domain. ATX increases thrombin-stimulated LPA production by washed platelets ~10-fold. When incubated under conditions to promote integrin activation, ATX generates LPA from CHO cells primed with bee venom phospholipase A(2), and ATX-mediated LPA production is enhanced more than 2-fold by CHO cell overexpression of integrin β(3). The effects of ATX on platelet and cell-associated LPA production, but not hydrolysis of small molecule or detergent-solubilized substrates, are attenuated by point mutations in the SMB2 that impair integrin binding. Integrin binding therefore localizes ATX activity to the cell surface, providing a mechanism to generate LPA in the vicinity of its receptors.
language: eng
source:
identifier: E-ISSN: 1083-351X ; DOI: 10.1074/jbc.M111.276725
fulltext: fulltext
issn:
  • 1083351X
  • 1083-351X
url: Link


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titleBinding of autotaxin to integrins localizes lysophosphatidic acid production to platelets and mammalian cells.
creatorFulkerson, Zachary ; Wu, Tao ; Sunkara, Manjula ; Kooi, Craig Vander ; Morris, Andrew J ; Smyth, Susan S
contributorFulkerson, Zachary (correspondence author) ; Fulkerson, Zachary (record owner)
ispartofThe Journal of biological chemistry, October 7, 2011, Vol.286(40), pp.34654-34663
identifierE-ISSN: 1083-351X ; DOI: 10.1074/jbc.M111.276725
subjectAnimals–Metabolism ; Blood Platelets–Metabolism ; Cho Cells–Chemistry ; Catalysis–Metabolism ; Cell Adhesion–Metabolism ; Cell Membrane–Chemistry ; Cricetinae–Metabolism ; Cricetulus–Metabolism ; Humans–Metabolism ; Integrins–Metabolism ; Lysophospholipids–Metabolism ; Phosphoric Diester Hydrolases–Metabolism ; Platelet Aggregation–Metabolism ; Platelet Glycoprotein Gpiib-Iiia Complex–Metabolism ; Protein Structure, Tertiary–Metabolism ; Signal Transduction–Metabolism ; Integrins ; Lysophospholipids ; Platelet Glycoprotein Gpiib-Iiia Complex ; Phosphoric Diester Hydrolases
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descriptionAutotaxin (ATX) is a secreted lysophospholipase D that generates the bioactive lipid mediator lysophosphatidic acid (LPA). We and others have reported that ATX binds to integrins, but the function of ATX-integrin interactions is unknown. The recently reported crystal structure of ATX suggests a role for the solvent-exposed surface of the N-terminal tandem somatomedin B-like domains in binding to platelet integrin αIIbβ(3). The opposite face of the somatomedin B-like domain interacts with the catalytic phosphodiesterase (PDE) domain to form a hydrophobic channel through which lysophospholipid substrates enter and leave the active site. Based on this structure, we hypothesize that integrin-bound ATX can access cell surface substrates and deliver LPA to cell surface receptors. To test this hypothesis, we investigated the integrin selectivity and signaling pathways that promote ATX binding to platelets. We report that both platelet β1 and β3 integrins interact in an activation-dependent manner with ATX via the SMB2 domain. ATX increases thrombin-stimulated LPA production by washed platelets ~10-fold. When incubated under conditions to promote integrin activation, ATX generates LPA from CHO cells primed with bee venom phospholipase A(2), and ATX-mediated LPA production is enhanced more than 2-fold by CHO cell overexpression of integrin β(3). The effects of ATX on platelet and cell-associated LPA production, but not hydrolysis of small molecule or detergent-solubilized substrates, are attenuated by point mutations in the SMB2 that impair integrin binding. Integrin binding therefore localizes ATX activity to the cell surface, providing a mechanism to generate LPA in the vicinity of its receptors.
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titleBinding of autotaxin to integrins localizes lysophosphatidic acid production to platelets and mammalian cells.
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