Inositol phosphates are assembly co-factors for HIV-1.

Inositol phosphates are assembly co-factors for HIV-1.
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DOI:
10.1038/s41586-018-0396-4
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发表时间:
2018-08
期刊:
影响因子:
64.8
通讯作者:
Vogt VM
Vogt VM
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Dick RA;Zadrozny KK;Xu C;Schur FKM;Lyddon TD;Ricana CL;Wagner JM;Perilla JR;Ganser-Pornillos BK;Johnson MC;Pornillos O;Vogt VM

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HIV-1病毒颗粒的信息,一个短的,14个氨基酸的片段称为SP1,位于Gag结构蛋白中,起着关键作用。在病毒组装过程中,SP1肽和前面的七个残基折叠成六螺旋束(6 HB),将Gag六聚体保持在一起,并促进在病毒膜下形成弯曲的未成熟六边形晶格。在完成组装和出芽后,Gag的蛋白水解裂解导致病毒成熟,其中未成熟的晶格被分解;释放的Gag的CA结构域然后重新组装成封闭病毒基因组和相关酶的成熟锥形衣壳。6 HB的折叠和蛋白水解是Gag组装和拆卸的关键限速步骤,并且6 HB是HIV-1抑制剂的既定靶标。使用结构和功能分析的组合,我们在这里表明,肌醇六磷酸(IP 6)促进形成的6 HB和组装的不成熟的HIV-1 Gag晶格。IP 6与Gag六聚体中心的两个赖氨酸残基环进行离子接触。然后蛋白水解裂解暴露出另一个结合位点,其中IP 6相互作用促进成熟衣壳晶格的组装。这些研究将IP 6确定为促进HIV-1组装和成熟的天然小分子。
Information of the HIV-1 virus particle, a short, 14-amino acid segment called SP1, located in the Gag structural protein, plays a critical role. During virus assembly the SP1 peptide and seven preceding residues fold into a six-helix bundle (6HB) that holds together the Gag hexamer and facilitates formation of a curved immature hexagonal lattice underneath the viral membrane. Upon completion of assembly and budding, proteolytic cleavage of Gag leads to virus maturation, in which the immature lattice is broken down; the liberated CA domain of Gag then re-assembles into the mature conical capsid that encloses the viral genome and associated enzymes. Folding and proteolysis of the 6HB are critical rate-limiting steps of both Gag assembly and disassembly, and the 6HB is an established target of HIV-1 inhibitors. Using a combination of structural and functional analyses, we show here that inositol hexakisphosphate (IP6) facilitates formation of the 6HB and assembly of the immature HIV-1 Gag lattice. IP6 makes ionic contacts with two rings of lysine residues at the center of the Gag hexamer. Proteolytic cleavage then unmasks an alternative binding site, where IP6 interaction promotes assembly of the mature capsid lattice. These studies identify IP6 as a naturally occurring small molecule that promotes both HIV-1 assembly and maturation.
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