National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
P01 AI157299
米国
引用
ジャーナル: Front Immunol / 年: 2024 タイトル: mRNA lipid nanoparticles expressing cell-surface cleavage independent HIV Env trimers elicit autologous tier-2 neutralizing antibodies. 著者: Javier Guenaga / Mehrdad Alirezaei / Yu Feng / Mohamad-Gabriel Alameh / Wen-Hsin Lee / Sabyasachi Baboo / Jocelyn Cluff / Richard Wilson / Shridhar Bale / Gabriel Ozorowski / Paulo Lin / Ying ...著者: Javier Guenaga / Mehrdad Alirezaei / Yu Feng / Mohamad-Gabriel Alameh / Wen-Hsin Lee / Sabyasachi Baboo / Jocelyn Cluff / Richard Wilson / Shridhar Bale / Gabriel Ozorowski / Paulo Lin / Ying Tam / Jolene K Diedrich / John R Yates / James C Paulson / Andrew B Ward / Drew Weissman / Richard T Wyatt / 要旨: The HIV-1 envelope glycoprotein (Env) is the sole neutralizing determinant on the surface of the virus. The Env gp120 and gp41 subunits mediate receptor binding and membrane fusion and are generated ...The HIV-1 envelope glycoprotein (Env) is the sole neutralizing determinant on the surface of the virus. The Env gp120 and gp41 subunits mediate receptor binding and membrane fusion and are generated from the gp160 precursor by cellular furins. This cleavage event is required for viral entry. One approach to generate HIV-1 neutralizing antibodies following immunization is to express membrane-bound Env anchored on the cell-surface by genetic means using the natural HIV gp41 transmembrane (TM) spanning domain. To simplify the process of Env trimer membrane expression we sought to remove the need for Env precursor cleavage while maintaining native-like conformation following genetic expression. To accomplish these objectives, we selected our previously developed 'native flexibly linked' (NFL) stabilized soluble trimers that are both near-native in conformation and cleavage-independent. We genetically fused the NFL construct to the HIV TM domain by using a short linker or by restoring the native membrane external proximal region, absent in soluble trimers, to express the full HIV Env ectodomain on the plasma membrane. Both forms of cell-surface NFL trimers, without and with the MPER, displayed favorable antigenic profiles by flow cytometry when expressed from plasmid DNA or mRNA. These results were consistent with the presence of well-ordered cell surface native-like trimeric Env, a necessary requirement to generate neutralizing antibodies by vaccination. Inoculation of rabbits with mRNA lipid nanoparticles (LNP) expressing membrane-bound stabilized HIV Env NFL trimers generated tier 2 neutralizing antibody serum titers in immunized animals. Multiple inoculations of mRNA LNPs generated similar neutralizing antibody titers compared to immunizations of matched NFL soluble proteins in adjuvant. Given the recent success of mRNA vaccines to prevent severe COVID, these are important developments for genetic expression of native-like HIV Env trimers in animals and potentially in humans.
全体 : HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab...
全体
名称: HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab from rabbit U5756
要素
複合体: HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab from rabbit U5756
複合体: HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab from rabbit U5756
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超分子 #1: HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab...
超分子
名称: HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab from rabbit U5756 タイプ: complex / ID: 1 / 親要素: 0 / 詳細: HIV-1 JR-FL NFL.664 soluble trimer
由来(天然)
生物種: Human immunodeficiency virus 1 (ヒト免疫不全ウイルス)
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超分子 #2: HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab...
超分子
名称: HIV-1 JR-FL NFL.664 soluble trimer in complex with polyclonal Fab from rabbit U5756 タイプ: complex / ID: 2 / 親要素: 1 / 詳細: polyclonal Fab from rabbit U5756
由来(天然)
生物種: Oryctolagus cuniculus (ウサギ)
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実験情報
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構造解析
手法
ネガティブ染色法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
濃度
0.02 mg/mL
緩衝液
pH: 7.4
染色
タイプ: NEGATIVE / 材質: uranyl formate / 詳細: 2% w/v
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電子顕微鏡法
顕微鏡
FEI TECNAI F20
撮影
フィルム・検出器のモデル: TVIPS TEMCAM-F416 (4k x 4k) 平均電子線量: 25.0 e/Å2