Animal secretory endolysosome channel discovery.

Animal secretory endolysosome channel discovery.
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动物分泌性内溶酶体通道的发现

DOI:
10.24272/j.issn.2095-8137.2020.358
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发表时间:
2021-03-18
影响因子:
4.9
通讯作者:
Deng CJ
Deng CJ
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang Y;Wang QQ;Zhao Z;Deng CJ

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已在来自所有生命界的生物体中鉴定出分泌性成孔蛋白(PFP)。我们对大铃蟾(Bombina maxima)的研究发现气溶素家族PFPs(af-PFPs)和三叶因子(TFFs)之间存在相互作用网络。作为蟾蜍af-PFP,BmALP 1可以在活性和非活性形式之间可逆地调节,其副产物BmALP 3作为负调节剂。BmALP 1与BmTFF 3相互作用形成一种称为βγ-CAT的细胞活性复合物。该PFP复合物的特征是作用于内吞途径并在内溶体上形成孔,包括刺激细胞巨胞饮。此外,βγ-CAT还能诱导和/或调节细胞胞吐作用,根据细胞环境和周围环境的不同,这些作用可促进蟾蜍的物质摄取和囊泡转运,同时维持黏膜屏障功能和免疫防御。基于实验证据,我们在此提出了由分泌的PFP在细胞内吞和外吞系统中进行的分泌性内溶酶体通道(SELC)途径,其中βγ-CAT是SELC蛋白的第一个实例。由于在细胞相互作用和环境适应中发挥重要作用,拟议的SELC蛋白途径应该在其他生物体中得到保留。
Secretory pore-forming proteins (PFPs) have been identified in organisms from all kingdoms of life. Our studies with the toad species Bombina maxima found an interaction network among aerolysin family PFPs (af-PFPs) and trefoil factors (TFFs). As a toad af-PFP, BmALP1 can be reversibly regulated between active and inactive forms, with its paralog BmALP3 acting as a negative regulator. BmALP1 interacts with BmTFF3 to form a cellular active complex called βγ-CAT. This PFP complex is characterized by acting on endocytic pathways and forming pores on endolysosomes, including stimulating cell macropinocytosis. In addition, cell exocytosis can be induced and/or modulated in the presence of βγ-CAT. Depending on cell contexts and surroundings, these effects can facilitate the toad in material uptake and vesicular transport, while maintaining mucosal barrier function as well as immune defense. Based on experimental evidence, we hereby propose a secretory endolysosome channel (SELC) pathway conducted by a secreted PFP in cell endocytic and exocytic systems, with βγ-CAT being the first example of a SELC protein. With essential roles in cell interactions and environmental adaptations, the proposed SELC protein pathway should be conserved in other living organisms.
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