Transforming Growth Factor-β (TGF-β1) Activates TAK1 via TAB1-mediated Autophosphorylation, Independent of TGF-β Receptor Kinase Activity in Mesangial Cells

Transforming growth factor-β1 (TGF-β1) is a multifunctional cytokine that signals through the interaction of type I (TβRI) and type II (TβRII) receptors to activate distinct intracellular pathways. TAK1 is a serine/threonine kinase that is rapidly activated by TGF-β1. However, the molecular mec...

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Veröffentlicht in:The Journal of biological chemistry 2009-08, Vol.284 (33), p.22285
Hauptverfasser: Sung Il Kim, Joon Hyeok Kwak, Hee-Jun Na, Jin Kuk Kim, Yan Ding, Mary E. Choi
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container_issue 33
container_start_page 22285
container_title The Journal of biological chemistry
container_volume 284
creator Sung Il Kim
Joon Hyeok Kwak
Hee-Jun Na
Jin Kuk Kim
Yan Ding
Mary E. Choi
description Transforming growth factor-β1 (TGF-β1) is a multifunctional cytokine that signals through the interaction of type I (TβRI) and type II (TβRII) receptors to activate distinct intracellular pathways. TAK1 is a serine/threonine kinase that is rapidly activated by TGF-β1. However, the molecular mechanism of TAK1 activation is incompletely understood. Here, we propose a mechanism whereby TAK1 is activated by TGF-β1 in primary mouse mesangial cells. Under unstimulated conditions, endogenous TAK1 is stably associated with TβRI. TGF-β1 stimulation causes rapid dissociation from the receptor and induces TAK1 phosphorylation. Deletion mutant analysis indicates that the juxtamembrane region including the GS domain of TβRI is crucial for its interaction with TAK1. Both TβRI-mediated TAK1 phosphorylation and TGF-β1-induced TAK1 phosphorylation do not require kinase activity of TβRI. Moreover, TβRI-mediated TAK1 phosphorylation correlates with the degree of its association with TβRI and requires kinase activity of TAK1. TAB1 does not interact with TGF-β receptors, but TAB1 is indispensable for TGF-β1-induced TAK1 activation. We also show that TRAF6 and TAB2 are required for the interaction of TAK1 with TβRI and TGF-β1-induced TAK1 activation in mouse mesangial cells. Taken together, our data indicate that TGF-β1-induced interaction of TβRI and TβRII triggers dissociation of TAK1 from TβRI, and subsequently TAK1 is phosphorylated through TAB1-mediated autophosphorylation and not by the receptor kinase activity of TβRI.
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Choi</creator><creatorcontrib>Sung Il Kim ; Joon Hyeok Kwak ; Hee-Jun Na ; Jin Kuk Kim ; Yan Ding ; Mary E. Choi</creatorcontrib><description>Transforming growth factor-β1 (TGF-β1) is a multifunctional cytokine that signals through the interaction of type I (TβRI) and type II (TβRII) receptors to activate distinct intracellular pathways. TAK1 is a serine/threonine kinase that is rapidly activated by TGF-β1. However, the molecular mechanism of TAK1 activation is incompletely understood. Here, we propose a mechanism whereby TAK1 is activated by TGF-β1 in primary mouse mesangial cells. Under unstimulated conditions, endogenous TAK1 is stably associated with TβRI. TGF-β1 stimulation causes rapid dissociation from the receptor and induces TAK1 phosphorylation. Deletion mutant analysis indicates that the juxtamembrane region including the GS domain of TβRI is crucial for its interaction with TAK1. Both TβRI-mediated TAK1 phosphorylation and TGF-β1-induced TAK1 phosphorylation do not require kinase activity of TβRI. Moreover, TβRI-mediated TAK1 phosphorylation correlates with the degree of its association with TβRI and requires kinase activity of TAK1. TAB1 does not interact with TGF-β receptors, but TAB1 is indispensable for TGF-β1-induced TAK1 activation. We also show that TRAF6 and TAB2 are required for the interaction of TAK1 with TβRI and TGF-β1-induced TAK1 activation in mouse mesangial cells. 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title Transforming Growth Factor-β (TGF-β1) Activates TAK1 via TAB1-mediated Autophosphorylation, Independent of TGF-β Receptor Kinase Activity in Mesangial Cells
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