2020
DOI: 10.1038/s41589-020-00672-8
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Interhelical interactions within the STIM1 CC1 domain modulate CRAC channel activation

Abstract: The calcium release activated calcium (CRAC) channel is activated by the endoplasmic reticulum-resident calcium sensor protein STIM1. Upon activation, STIM1 C-terminus changes from an inactive, tight to an active, extended conformation. A coiled-coil (CC) clamp involving the CC1 and CC3 domains is essential in controlling STIM1 activation, with CC1 as key entity. The NMR-derived solution structure of the CC1 domain represents a three-helix bundle stabilized by interhelical contacts, which are absent in the Sto… Show more

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Cited by 25 publications
(75 citation statements)
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References 50 publications
(88 reference statements)
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“…6). These results are consistent with NMR studies showing that R304W causes N-terminal extension of the CC1α3 helix, stiffening the CC1α2/α3 linker 29,41 . Release of CC1α1 from CAD, or deletion of the CC1 domain altogether, did not cause a gross change in CAD structure, although it did alter the conformation of the CAD apex (Fig.…”
Section: Discussionsupporting
confidence: 91%
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“…6). These results are consistent with NMR studies showing that R304W causes N-terminal extension of the CC1α3 helix, stiffening the CC1α2/α3 linker 29,41 . Release of CC1α1 from CAD, or deletion of the CC1 domain altogether, did not cause a gross change in CAD structure, although it did alter the conformation of the CAD apex (Fig.…”
Section: Discussionsupporting
confidence: 91%
“…3a, top), as well as between labels at their C-termini (blue histogram in Fig. 3a, bottom), indicating that the CC1α1 domain (a continuous α-helix 23,29 ) is oriented parallel to CC3 in the predominant ctSTIM1 conformation.…”
Section: Cc1α1 Docks Parallel To Cc3 In a Domain-swapped Configuratiomentioning
confidence: 99%
“…A polybasic lysine-rich domain (PBD) sits at the outermost C-terminus, allowing it to interact with negatively charged phospholipids in the PM (Figure 1) [8,[48][49][50][51]. Additionally, the CC1 domain is further subdivided into three α-helices named α1, α2, and α3 [20][21][22][52][53][54], while CAD/SOAR is separated into four helical regions named Sα1, Sα2, Sα3, and Sα4 [52,55].…”
Section: Stim Proteinsmentioning
confidence: 99%
“…The focus is on competitive interactions of cytosolic domains of STIM. The recently published functional data as well as structural data from nuclear magnetic resonance (NMR) spectroscopy and molecular dynamics (MD) simulations have been essential in advancing and complementing the characterization of STIM [15,21,22,30]. Moreover, we report results of ongoing functional investigations that are based on these novel NMR data.…”
Section: Introductionmentioning
confidence: 98%
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