National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
T32 AI055403
米国
Max Planck Society
ドイツ
引用
ジャーナル: bioRxiv / 年: 2024 タイトル: The conserved HIV-1 spacer peptide 2 triggers matrix lattice maturation. 著者: James C V Stacey / Dominik Hrebík / Elizabeth Nand / Snehith Dyavari Shetty / Kun Qu / Marius Boicu / Maria Anders-Össwein / Robert A Dick / Walther Mothes / Hans-Georg Kräusslich / ...著者: James C V Stacey / Dominik Hrebík / Elizabeth Nand / Snehith Dyavari Shetty / Kun Qu / Marius Boicu / Maria Anders-Össwein / Robert A Dick / Walther Mothes / Hans-Georg Kräusslich / Barbara Müller / John A G Briggs / 要旨: HIV-1 particles are released in an immature, non-infectious form. Proteolytic cleavage of the main structural polyprotein Gag into functional domains induces rearrangement into mature, infectious ...HIV-1 particles are released in an immature, non-infectious form. Proteolytic cleavage of the main structural polyprotein Gag into functional domains induces rearrangement into mature, infectious virions. In immature virus particles, the Gag membrane binding domain, MA, forms a hexameric protein lattice that undergoes structural transition upon cleavage into a distinct, mature MA lattice. The mechanism of MA lattice maturation is unknown. Here we show that released spacer peptide 2 (SP2), a conserved peptide of unknown function situated ~300 residues downstream of MA, binds MA to induce structural maturation. By high-resolution in-virus structure determination of MA, we show that MA does not bind lipid into a side pocket as previously thought, but instead binds SP2 as an integral part of the protein-protein interfaces that stabilise the mature lattice. Analysis of Gag cleavage site mutants showed that SP2 release is required for MA maturation, and we demonstrate that SP2 is sufficient to induce maturation of purified MA on lipid layers in vitro. SP2-triggered MA maturation correlated with faster fusion of virus with target cells. Our results reveal a new, unexpected interaction between two HIV-1 components, provide a high-resolution structure of mature MA, establish the trigger of MA structural maturation, and assign function to the SP2 peptide.
選択した数: 5801053 詳細: A new model was trained in crYOLO using a training dataset annotated in a randomly selected set of 50-100 micrographs. Annotation was performed in the crYOLO boxmanager GUI placing positions ...詳細: A new model was trained in crYOLO using a training dataset annotated in a randomly selected set of 50-100 micrographs. Annotation was performed in the crYOLO boxmanager GUI placing positions all over the visible surface of an HIV virus particle. The picks did not distinguish individual proteins or membranes.
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 4.3)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 4.3)
最終 3次元分類
クラス数: 8 / 平均メンバー数/クラス: 72032 / ソフトウェア - 名称: cryoSPARC (ver. 4.3) 詳細: particles were symmetry expanded and moved to their neighbouring symmetry centres to increase the number of particles after classification