ArticlebioRxiv : the preprint server for biology2024
Syntaxin11 Deficiency Inhibits CRAC Channel Priming To Suppress Cytotoxicity And Gene Expression In FHLH4 Patient T Lymphocytes.
Article in bioRxiv : the preprint server for biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
CRAC channels enable calcium entry from the extracellular space in response to a variety of stimuli and are crucial for gene expression and granule exocytosis in lymphocytes. Here we find that Syntaxin11, a Q-SNARE, associated with FHLH4 disease in human patients, directly binds Orai1, the pore forming subunit of CRAC channels. Syntaxin11 depletion strongly inhibited SOCE, CRAC currents, IL-2 expression and cytotoxicity in cell lines and FHLH4 patient T lymphocytes. Constitutively active H134 Orai1 mutant completely reconstituted calcium entry in Syntaxin11 depleted cells and the defects of granule exocytosis as well as gene expression could be bypassed by ionomycin induced calcium influx in FHLH4 T lymphocytes. Our data reveal a Syntaxin11 induced pre-activation state of Orai which is necessary for its subsequent coupling and gating by the endoplasmic reticulum resident Stim protein. We propose that ion channel regulation by specific SNAREs is a primary and conserved function which may have preceded their role in vesicle fusion.
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