Cryo-EM structures of human arachidonate 12S-lipoxygenase bound to endogenous and exogenous inhibitors
•The first full-length structure of human arachidonate 12-LOX reveal mechanisms of its oligomeric and conformational states.•The structures uncover the natural inhibitor of 12-LOX and reveal the binding site of inhibitor ML355. [Display omitted] Human 12-lipoxygenase (12-LOX) is a key enzyme involve...
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Published in | Blood Vol. 142; no. 14; pp. 1233 - 1242 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
Elsevier Inc
05.10.2023
The American Society of Hematology |
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Abstract | •The first full-length structure of human arachidonate 12-LOX reveal mechanisms of its oligomeric and conformational states.•The structures uncover the natural inhibitor of 12-LOX and reveal the binding site of inhibitor ML355.
[Display omitted]
Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme.
The enzyme human arachidonate 12S-lipoxygenase (12-LOX) is expressed in platelets where it promotes activation of αIIbβ3, glycoprotein VI, and protease-activated receptor 4. Mobbs et al report on high resolution structures of 12-LOX obtained by cryogenic electron microscopy. The authors elucidate oligomeric states, conformational plasticity, and binding interactions, providing new knowledge that may accelerate the development of antithrombotic structure–based inhibitors. |
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AbstractList | •The first full-length structure of human arachidonate 12-LOX reveal mechanisms of its oligomeric and conformational states.•The structures uncover the natural inhibitor of 12-LOX and reveal the binding site of inhibitor ML355.
[Display omitted]
Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme.
The enzyme human arachidonate 12S-lipoxygenase (12-LOX) is expressed in platelets where it promotes activation of αIIbβ3, glycoprotein VI, and protease-activated receptor 4. Mobbs et al report on high resolution structures of 12-LOX obtained by cryogenic electron microscopy. The authors elucidate oligomeric states, conformational plasticity, and binding interactions, providing new knowledge that may accelerate the development of antithrombotic structure–based inhibitors. Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme. Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme.Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme. • The first full-length structure of human arachidonate 12-LOX reveal mechanisms of its oligomeric and conformational states. • The structures uncover the natural inhibitor of 12-LOX and reveal the binding site of inhibitor ML355. Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme. The enzyme human arachidonate 12S-lipoxygenase (12-LOX) is expressed in platelets where it promotes activation of αIIbβ3, glycoprotein VI, and protease-activated receptor 4. Mobbs et al report on high resolution structures of 12-LOX obtained by cryogenic electron microscopy. The authors elucidate oligomeric states, conformational plasticity, and binding interactions, providing new knowledge that may accelerate the development of antithrombotic structure–based inhibitors. |
Author | Black, Katrina A. Tran, Michelle Holinstat, Michael Glukhova, Alisa Burger, Wessel A. C. Thal, David M. Venugopal, Hariprasad Mobbs, Jesse I. Holman, Theodore R. |
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Snippet | •The first full-length structure of human arachidonate 12-LOX reveal mechanisms of its oligomeric and conformational states.•The structures uncover the natural... Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of... • The first full-length structure of human arachidonate 12-LOX reveal mechanisms of its oligomeric and conformational states. • The structures uncover the... |
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SubjectTerms | Arachidonate 12-Lipoxygenase - metabolism Arachidonic Acid - metabolism Cryoelectron Microscopy Humans Platelet Activation Platelets and Thrombopoiesis Thrombocytopenia United States |
Title | Cryo-EM structures of human arachidonate 12S-lipoxygenase bound to endogenous and exogenous inhibitors |
URI | https://dx.doi.org/10.1182/blood.2023020441 https://www.ncbi.nlm.nih.gov/pubmed/37506345 https://www.proquest.com/docview/2854435758 https://pubmed.ncbi.nlm.nih.gov/PMC10579047 |
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