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X-ray structure of phospholipase A2 complexed with a substrate-derived inhibitor

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Abstract

PHOSPHOLIPASES A2 play a part in a number of physiologically important cellular processes such as inflammation, blood platelet aggregation and acute hypersensitivity1,2. These processes are all initiated by the release of arachidonic acid from cell membranes which is catalysed by intracellular phospholipases A2 and followed by conversion of arachidonic acid to prostaglandins, leukotrienes or thromboxanes3. An imbalance in the production of these com-pounds can lead to chronic inflammatory diseases such as rheumatoid arthritis and asthma. Inhibitors of phospholipase A2 might therefore act to reduce the effects of inflammation, so structural information about the binding of phospholipase A2 to its substrates could be helpful in the design of therapeutic drugs. The three-dimensional structure is not known for any intracellular phospholipase A2, but these enzymes share significant sequence homology4–6 with secreted phospholipases, for which some of the structures have been determined7–10. Here we report the structure of a complex between an extracellular phospholipase A2 and a competitively inhibiting substrate analogue, which reveals considerable detail about the interaction and suggests a mechanism for catalysis by this enzyme.

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Author notes

  1. Oscar P. Kuipers, Ruud Dijkman and Gerard H. de Haas: Department of Enzymology and Protein Engineering, University of Utrecht, Center for Biomembranes and Lipid Enzymology, PO Box 80054, 3508 TB Utrecht, The Netherlands

Authors and Affiliations

  1. Laboratory of Chemical Physics, University of Groningen, Nijenborgh 16, 9747 AG, Groningen, The Netherlands

    Marjolein M. G. M. Thunnissen, Eiso AB, Kor H. Kalk , Jan Drenth, Bauke W. Dijkstra, Oscar P. Kuipers, Ruud Dijkman, Gerard H. de Haas & Hubertus M. Verheij

Authors
  1. Marjolein M. G. M. Thunnissen
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  2. Eiso AB
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  3. Kor H. Kalk
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  4. Jan Drenth
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  5. Bauke W. Dijkstra
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  6. Oscar P. Kuipers
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  7. Ruud Dijkman
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  8. Gerard H. de Haas
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  9. Hubertus M. Verheij
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Thunnissen, M., AB, E., Kalk , K. et al. X-ray structure of phospholipase A2 complexed with a substrate-derived inhibitor. Nature 347, 689–691 (1990). https://doi.org/10.1038/347689a0

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