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ChemicalBook >> journal list >> Journal of Structural Biology: X >>article
Journal of Structural Biology: X

Journal of Structural Biology: X

IF: 3.5
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Conformational switches that control the TEC kinase – PLCγ signaling axis

Published:1 January 2022 DOI: 10.1016/j.yjsbx.2022.100061 PMID: 35128378
Jacques Lowe, Raji E. Joseph, Amy H. Andreotti

Abstract

Cell surface receptors such as the T-cell receptor (TCR) and B-cell receptor (BCR) engage with external stimuli to transmit information into the cell and initiate a cascade of signaling events that lead to gene expression that drives the immune response. At the heart of controlling T- and B-cell cell signaling, phospholipase Cγ hydrolyzes membrane associated PIP2, leading to generation of the second messengers IP3 and DAG. These small molecules trigger mobilization of intracellular Ca2+ and promote transcription factor transport into the nucleus launching the adaptive immune response. The TEC family kinases are responsible for phosphorylating and activating PLCγ, and our group aims to understand mechanisms that regulate immune cell signal transduction by focusing on this kinase/phospholipase axis in T-cells and B-cells. Here, we review the current molecular level understanding of how the TEC kinases (ITK and BTK) and PLCγ1/2 are autoinhibited prior to activation of cell surface receptors, how TEC kinases are activated to specifically recognize the PLCγ substrate, and how conformational changes induced by phosphorylation trigger PLCγ activation.

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