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• W2894869229 abstract "Transgelin-1 (SM22α) has been recognized as a smooth muscle marker and a tumor suppressor, but many details of the working mechanisms remain unclear. Transgelin-1 belongs to the calponin family of actin-binding proteins with an N-terminal calponin homology domain (CH-domain) and a C-terminal calponin-like module (CLIK23). Here, we demonstrate that transgelin-1 interacts with actin stress fibers and podosomes in smooth muscle cells via its type-3 CH-domain, while CLIK23 is dispensable for the binding to the actin structures. We further suggest that the EF-hand motif in transgelin-1 contributes to proper folding of the CH-domain and in turn to the interaction with the actin structures. These results are in contrast to the ones reported in in vitro studies that demonstrated CLIK23 was necessary for the transgelin-1–actin binding, while the CH-domain was not. Besides, within cells, transgelin-1 phosphorylation at Ser181 in CLIK23 did not affect its colocalization with the actin structures, while the same phosphorylation was reported in in vitro studies to negatively regulate actin binding. Thus, our results suggest the molecular basis of intracellular interaction between transgelin-1 and actin, distinct from that in vitro. The actin binding capability intrinsic to CLIK23 may not appear within cells probably because of the weaker competition for actin binding compared to other actin binding molecules." @default.
• W2894869229 created "2018-10-12" @default.
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• W2894869229 date "2018-11-01" @default.
• W2894869229 modified "2023-09-23" @default.
• W2894869229 title "Transgelin-1 (SM22α) interacts with actin stress fibers and podosomes in smooth muscle cells without using its actin binding site" @default.
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• W2894869229 doi "https://doi.org/10.1016/j.bbrc.2018.09.176" @default.
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