期刊
FEBS JOURNAL
卷 280, 期 8, 页码 1795-1806出版社
WILEY-BLACKWELL
DOI: 10.1111/febs.12203
关键词
calmodulin binding protein; cell adhesion molecule; contractile vacuoles; Dictyosteliumdiscoideum; unconventional protein transport
资金
- Canadian Institutes of Health Research [FRN-6140]
- Ontario Graduate Scholarship
The Ca2+-dependent cellcell adhesion molecule DdCAD-1, encoded by the cadA gene of Dictyosteliumdiscoideum, is synthesized at the onset of development as a soluble protein and then transported to the plasma membrane by contractile vacuoles. Calmodulin associates with contractile vacuoles in a Ca2+-dependent manner, and co-localizes with DdCAD-1 on the surface of contractile vacuoles. Bioinformatics analysis revealed multiple calmodulin-binding motifs in DdCAD-1. Co-immunoprecipitation and pull-down studies showed that only Ca2+-bound calmodulin was able to bind DdCAD-1. Structural integrity of DdCAD-1, but not the native conformation, was required for its interaction with calmodulin. To investigate the role of calmodulin in the import of DdCAD-1 into contractile vacuoles, an invitro import assay consisting of contractile vacuoles derived from cadA cells and recombinant proteins was employed. Prior stripping of the bound calmodulin from contractile vacuoles by EGTA impaired import of DdCAD-1, which was restored by addition of exogenous calmodulin. The calmodulin antagonists W-7 and compound 48/80 blocked the binding of calmodulin onto stripped contractile vacuoles, and inhibited the import of DdCAD-1. Together, the data show that calmodulin forms a complex with DdCAD-1 and promotes the docking and import of DdCAD-1 into contractile vacuoles. Structured digital abstract CaM physically interacts with DdCAD-1 by pull down (View Interaction: 1, 2) DdCAD-1 binds to CaM by far western blotting (View interaction) DdCAD-1 physically interacts with CaM by anti bait coimmunoprecipitation (View interaction)
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据