ABHD10 is an S-depalmitoylase affecting redox homeostasis through peroxiredoxin-5
作者:Yang Cao、Tian Qiu、Rahul S. Kathayat、Saara-Anne Azizi、Anneke K. Thorne、Daniel Ahn、Yuko Fukata、Masaki Fukata、Phoebe A. Rice、Bryan C. Dickinson
DOI:10.1038/s41589-019-0399-y
日期:2019.12
S-Palmitoylation is a reversible lipid post-translational modification that has been observed on mitochondrial proteins, but both the regulation and functional consequences of mitochondrial S-palmitoylation are poorly understood. Here, we show that perturbing the âerasersâ of S-palmitoylation, acyl protein thioesterases (APTs), with either pan-active inhibitors or a mitochondrial-targeted APT inhibitor, diminishes the antioxidant buffering capacity of mitochondria. Surprisingly, this effect was not mediated by the only known mitochondrial APT, but rather by a resident mitochondrial protein with no known endogenous function, ABHD10. We show that ABHD10 is a member of the APT family of regulatory proteins and identify peroxiredoxin-5 (PRDX5), a key antioxidant protein, as a target of ABHD10 S-depalmitoylase activity. We then find that ABHD10 regulates the S-palmitoylation status of the nucleophilic active site residue of PRDX5, providing a direct mechanistic connection between ABHD10-mediated S-depalmitoylation of PRDX5 and its antioxidant capacity. A mitochondrial-targeted acyl protein thioesterase inhibitor enables the identification of ABHD10 as a mitochondrial S-depalmitoylase that acts on the nucleophilic active site residue of peroxiredoxin-5 to modulate its antioxidant capacity.
S-棕榈酰化是一种可逆的脂质翻译后修饰,已在线粒体蛋白上观察到,但线粒体S-棕榈酰化的调节和功能后果尚不清楚。在这里,我们表明,用泛活性抑制剂或线粒体靶向的APT抑制剂干扰S-棕榈酰化的“橡皮擦”,酰基蛋白硫酯酶(APT),会降低线粒体的抗氧化缓冲能力。令人惊讶的是,这种效应不是由唯一已知的线粒体APT介导的,而是由一种没有已知内源功能的线粒体驻留蛋白ABHD10介导的。我们表明,ABHD10是APT调节蛋白家族的一员,并确定过氧化物还原酶-5(PRDX5)是一种关键的抗氧化蛋白,是ABHD10 S-去棕榈酰化酶活性的靶标。然后,我们发现ABHD10调节PRDX5亲核活性位点残基的S-棕榈酰化状态,在ABHD10介导的PRDX5 S-去棕榈酰化和其抗氧化能力之间提供了直接的机制联系。线粒体靶向酰基蛋白硫酯酶抑制剂能够确定ABHD10是一种线粒体S-去棕榈酰化酶,作用于过氧化物还原酶-5的亲核活性位点残基,以