The PripA-TbcrA complex-centered Rab GAP cascade facilitates macropinosome maturation in Dictyostelium.

The PripA-TbcrA complex-centered Rab GAP cascade facilitates macropinosome maturation in Dictyostelium.
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以 PripA-TbcrA 复合物为中心的 Rab GAP 级联促进盘基网柄菌中巨胞质体的成熟

DOI:
10.1038/s41467-022-29503-1
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发表时间:
2022-04-04
影响因子:
16.6
通讯作者:
Cai H
Cai H
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tu H;Wang Z;Yuan Y;Miao X;Li D;Guo H;Yang Y;Cai H

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巨胞饮作用是一种进化上保守的介导细胞外液非特异性大量摄取的机制,被认为具有多种功能。新生的大胞饮体如何在内化后成熟仍然是未知的。通过寻找在网骨藻Rab 5-Rab 7过渡阶段定位于大胞饮体上的蛋白质,我们发现了由两种蛋白质组成的复合物,我们将其命名为PripA和TbcrA。我们发现,Rab 5到Rab 7转换涉及Rab 5标记的早期macropinosomes与Rab 7标记的晚期macropinosomes融合。PripA通过与PI(3,4)P2和Rab 7相互作用连接两个膜隔室。此外,PripA会招募TbcrA,它充当GAP,以关闭Rab 5。因此,向Rab 7的转化与上游Rab 5的失活有关。一致地,破坏pripA或tbcrA损害Rab 5失活和巨胞饮细胞货物加工。因此,PripA-TbcrA复合物是Rab GAP级联的中心组分,其在巨胞饮体成熟期间促进程序化Rab开关和有效的货物运输。巨胞饮作用已经成为一种进化上保守的大量摄取细胞外液的机制。在这里,他们展示了以PripA-TbcrA复合物为中心的Rab GAP级联如何促进Rab转化和巨胞饮体成熟。
Macropinocytosis, an evolutionarily conserved mechanism mediating nonspecific bulk uptake of extracellular fluid, has been ascribed diverse functions. How nascent macropinosomes mature after internalization remains largely unknown. By searching for proteins that localize on macropinosomes during the Rab5-to-Rab7 transition stage in Dictyostelium, we uncover a complex composed of two proteins, which we name PripA and TbcrA. We show that the Rab5-to-Rab7 conversion involves fusion of Rab5-marked early macropinosomes with Rab7-marked late macropinosomes. PripA links the two membrane compartments by interacting with PI(3,4)P2 and Rab7. In addition, PripA recruits TbcrA, which acts as a GAP, to turn off Rab5. Thus, the conversion to Rab7 is linked to inactivation of the upstream Rab5. Consistently, disruption of either pripA or tbcrA impairs Rab5 inactivation and macropinocytic cargo processing. Therefore, the PripA-TbcrA complex is the central component of a Rab GAP cascade that facilitates programmed Rab switch and efficient cargo trafficking during macropinosome maturation. Macropinocytosis has emerged as an evolutionarily conserved mechanism for bulk uptake of extracellular fluid. Here they show how a Rab GAP cascade centered on the PripA-TbcrA complex facilitates Rab conversion and macropinosome maturation.
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