Plasmodium falciparum Sir2A preferentially hydrolyzes medium and long chain fatty acyl lysine.

Plasmodium falciparum Sir2A preferentially hydrolyzes medium and long chain fatty acyl lysine.
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DOI:
10.1021/cb200230x
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发表时间:
2012-01-20
影响因子:
4
通讯作者:
Lin, Hening
Lin, Hening
中科院分区:
生物学2区
文献类型:
--
作者:
Zhu, Anita Y.;Zhou, Yeyun;Khan, Saba;Deitsch, Kirk W.;Hao, Quan;Lin, Hening

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恶性疟原虫Sir2 A(PfSir2 A)是烟酰胺腺嘌呤二核苷酸依赖性脱乙酰酶sirtuin家族的一员,通过调节表面抗原的表达来逃避宿主免疫监视的检测。PfSir2A被认为是通过去乙酰化组蛋白来实现这一点的。但PfSir2A的脱乙酰酶活性较弱。在这里,我们提供了支持PfSir2A更有效地催化从赖氨酸残基中水解中长链脂肪酰基的酶学和结构证据。此外,恶性疟原虫蛋白中含有这种脂肪酰基赖氨酸修饰,这种修饰可以在体外被纯化的PfSir2A去除。综上所述,这些数据表明PfSir2A在抗原变异中的生理功能可能是通过去除蛋白质赖氨酸残基上的中长链脂肪酰基来实现的。PfSir2A的强劲活性也将促进PfSir2A抑制剂的开发,这可能在疟疾治疗中具有治疗价值。
Plasmodium falciparum Sir2A (PfSir2A), a member of the sirtuin family of nicotinamide adenine dinucleotide-dependent deacetylases, has been shown to regulate the expression of surface antigens to evade the detection by host immune surveillance. It is thought that PfSir2A achieves this by deacetylating histones. However, the deacetylase activity of PfSir2A is weak. Here we present enzymology and structural evidences supporting that PfSir2A catalyzes the hydrolysis of medium and long chain fatty acyl groups from lysine residues more efficiently. Furthermore, P. falciparum proteins are found to contain such fatty acyl lysine modifications that can be removed by purified PfSir2A in vitro. Together, the data suggest that the physiological function of PfSir2A in antigen variation may be achieved by removing medium and long chain fatty acyl groups from protein lysine residues. The robust activity of PfSir2A would also facilitate the development of PfSir2A inhibitors, which may have therapeutic value in malaria treatment.
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