Conserved functions of membrane active GTPases in coated vesicle formation.

Conserved functions of membrane active GTPases in coated vesicle formation.
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DOI:
10.1126/science.1171004
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发表时间:
2009-09-04
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Schmid SL
Schmid SL
中科院分区:
其他
文献类型:
--
作者:
Pucadyil TJ;Schmid SL

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包被囊泡浓缩和包装货物分子,以介导其在细胞内隔室之间的有效运输。胞质外壳蛋白,如网格蛋白和接头复合物,以及COPI和COPII涂层复合物自组装使膜变形,并直接与货物分子相互作用,在新生芽中捕获它们。gtp酶Arf、Sar1和dynamin是包被囊泡机制的核心组成部分。这些gtp酶以gtp依赖的方式与供体膜结合并分离,也可以积极地重塑膜。最近的证据表明,尽管结构不同,arf家族gtp酶和动力蛋白可能在机械上发挥相似的作用,如控制货物包装和包被囊泡成熟的保真度监控器,以及作为裂变机制的组成部分来调节囊泡释放。
Coated vesicles concentrate and package cargo molecules to mediate their efficient transport between intracellular compartments. Cytosolic coat proteins such as clathrin and adaptor complexes, and COPI and COPII coatomer complexes self-assemble to deform the membrane and interact directly with cargo molecules to capture them in nascent buds. The GTPases Arf, Sar1 and dynamin are core components of the coated vesicle machinery. These GTPases, which associate with and dissociate from donor membranes in a GTP-dependent manner, can also actively remodel membranes. Recent evidence suggests that although structurally diverse, Arf-family GTPases and dynamin may play mechanistically similar roles as fidelity monitors that govern cargo packaging and coated vesicle maturation, and as components of the fission machinery to mediate vesicle release.
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