FerA is a Membrane-Associating Four-Helix Bundle Domain in the Ferlin Family of Membrane-Fusion Proteins.

FerA is a Membrane-Associating Four-Helix Bundle Domain in the Ferlin Family of Membrane-Fusion Proteins.
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DOI:
10.1038/s41598-018-29184-1
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发表时间:
2018-07-19
期刊:
影响因子:
4.6
通讯作者:
Sutton RB
Sutton RB
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Harsini FM;Chebrolu S;Fuson KL;White MA;Rice AM;Sutton RB

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Ferlin蛋白参与线虫的囊泡融合、成肌细胞膜融合形成肌管、内耳毛细胞胞吐过程中的钙感知以及骨骼肌细胞的钙依赖性膜修复等多种生物学事件。FERLINS是一种钙离子依赖、磷脂结合、含有多个C2结构域的蛋白质,具有一个跨膜螺旋,跨越一个囊泡膜。这些费林蛋白的结构域组成与胞吐作用所涉及的蛋白质相似,因此,人们认为它们在某种程度上参与了膜融合。但是,如果蕨蛋白确实融合了膜,那么它们就不同于其他已知的融合蛋白。在这里,我们证明了来自dyferlin、myoferlin和otoferlin的中央fera结构域是一个新的四螺旋束折叠结构域,它具有自己的依赖于钙的磷脂结合活性。小角X射线散射(SAXS),光谱和热力学分析,除临床定义的deferlin fera突变外,还对dyferlin、myoferlin和otoferlin fera结构域进行了分析,表明fera结构域与膜相互作用,这种相互作用因钙的存在而增强。
Ferlin proteins participate in such diverse biological events as vesicle fusion in C. elegans, fusion of myoblast membranes to form myotubes, Ca2+-sensing during exocytosis in the hair cells of the inner ear, and Ca2+-dependent membrane repair in skeletal muscle cells. Ferlins are Ca2+-dependent, phospholipid-binding, multi-C2 domain-containing proteins with a single transmembrane helix that spans a vesicle membrane. The overall domain composition of the ferlins resembles the proteins involved in exocytosis; therefore, it is thought that they participate in membrane fusion at some level. But if ferlins do fuse membranes, then they are distinct from other known fusion proteins. Here we show that the central FerA domain from dysferlin, myoferlin, and otoferlin is a novel four-helix bundle fold with its own Ca2+-dependent phospholipid-binding activity. Small-angle X-ray scattering (SAXS), spectroscopic, and thermodynamic analysis of the dysferlin, myoferlin, and otoferlin FerA domains, in addition to clinically-defined dysferlin FerA mutations, suggests that the FerA domain interacts with the membrane and that this interaction is enhanced by the presence of Ca2+.
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