Phafins Are More Than Phosphoinositide-Binding Proteins.

Phafins Are More Than Phosphoinositide-Binding Proteins.
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DOI:
10.3390/ijms24098096
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发表时间:
2023-04-30
影响因子:
5.6
通讯作者:
Capelluto, Daniel G. S.
Capelluto, Daniel G. S.
中科院分区:
生物学2区
文献类型:
--
作者:
Tang, Tuoxian;Hasan, Mahmudul;Capelluto, Daniel G. S.

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Phafins是含有PH(Pleckstrin同源)和FYVE(FAB1、YOTB、Vac1和EEA1)结构域的蛋白质。根据序列同源性和功能相似性,Phafin蛋白家族分为两类:Phafin1和Phafin2。这个蛋白质家族是独一无二的,因为PH和FYVE结构域都与磷脂酰肌醇3-磷酸[PtdIns(3)P]结合,磷脂酰肌醇(PtdIns(3)P)是一种主要存在于内膜和溶酶体膜上的磷脂酰肌醇。Phafin蛋白作为PtdIns(3)P的效应物,在细胞凋亡、细胞内货物运输和自噬中发挥作用。此外,通过PtdIns(3)P和PtdIns(4)P的符合检测,Phafin2被招募到大胞质隔室。膜相关的Phafins作为接头蛋白招募其他结合伙伴。除了磷脂酰肌醇结合区外,Phafin蛋白还呈现一个聚天冬氨酸基序,调节膜结合的特异性。在这篇综述中,我们总结了Phafins在几个细胞通路中的参与及其潜在的生理功能,同时强调了Phafin1和Phafin2的异同。此外,我们还讨论了对Phafins的研究前景。
Phafins are PH (Pleckstrin Homology) and FYVE (Fab1, YOTB, Vac1, and EEA1) domain-containing proteins. The Phafin protein family is classified into two groups based on their sequence homology and functional similarity: Phafin1 and Phafin2. This protein family is unique because both the PH and FYVE domains bind to phosphatidylinositol 3-phosphate [PtdIns(3)P], a phosphoinositide primarily found in endosomal and lysosomal membranes. Phafin proteins act as PtdIns(3)P effectors in apoptosis, endocytic cargo trafficking, and autophagy. Additionally, Phafin2 is recruited to macropinocytic compartments through coincidence detection of PtdIns(3)P and PtdIns(4)P. Membrane-associated Phafins serve as adaptor proteins that recruit other binding partners. In addition to the phosphoinositide-binding domains, Phafin proteins present a poly aspartic acid motif that regulates membrane binding specificity. In this review, we summarize the involvement of Phafins in several cellular pathways and their potential physiological functions while highlighting the similarities and differences between Phafin1 and Phafin2. Besides, we discuss research perspectives for Phafins.
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