National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM103310
United States
Simons Foundation
SF349247
United States
Citation
Journal: Nat Commun / Year: 2024 Title: Cleavage-intermediate Lassa virus trimer elicits neutralizing responses, identifies neutralizing nanobodies, and reveals an apex-situated site-of-vulnerability. Authors: Jason Gorman / Crystal Sao-Fong Cheung / Zhijian Duan / Li Ou / Maple Wang / Xuejun Chen / Cheng Cheng / Andrea Biju / Yaping Sun / Pengfei Wang / Yongping Yang / Baoshan Zhang / Jeffrey C ...Authors: Jason Gorman / Crystal Sao-Fong Cheung / Zhijian Duan / Li Ou / Maple Wang / Xuejun Chen / Cheng Cheng / Andrea Biju / Yaping Sun / Pengfei Wang / Yongping Yang / Baoshan Zhang / Jeffrey C Boyington / Tatsiana Bylund / Sam Charaf / Steven J Chen / Haijuan Du / Amy R Henry / Tracy Liu / Edward K Sarfo / Chaim A Schramm / Chen-Hsiang Shen / Tyler Stephens / I-Ting Teng / John-Paul Todd / Yaroslav Tsybovsky / Raffaello Verardi / Danyi Wang / Shuishu Wang / Zhantong Wang / Cheng-Yan Zheng / Tongqing Zhou / Daniel C Douek / John R Mascola / David D Ho / Mitchell Ho / Peter D Kwong / Abstract: Lassa virus (LASV) infection is expanding outside its traditionally endemic areas in West Africa, posing a pandemic biothreat. LASV-neutralizing antibodies, moreover, have proven difficult to elicit. ...Lassa virus (LASV) infection is expanding outside its traditionally endemic areas in West Africa, posing a pandemic biothreat. LASV-neutralizing antibodies, moreover, have proven difficult to elicit. To gain insight into LASV neutralization, here we develop a prefusion-stabilized LASV glycoprotein trimer (GPC), pan it against phage libraries comprising single-domain antibodies (nanobodies) from shark and camel, and identify one, D5, which neutralizes LASV. Cryo-EM analyses reveal D5 to recognize a cleavage-dependent site-of-vulnerability at the trimer apex. The recognized site appears specific to GPC intermediates, with protomers lacking full cleavage between GP1 and GP2 subunits. Guinea pig immunizations with the prefusion-stabilized cleavage-intermediate LASV GPC, first as trimer and then as a nanoparticle, induce neutralizing responses, targeting multiple epitopes including that of D5; we identify a neutralizing antibody (GP23) from the immunized guinea pigs. Collectively, our findings define a prefusion-stabilized GPC trimer, reveal an apex-situated site-of-vulnerability, and demonstrate elicitation of LASV-neutralizing responses by a cleavage-intermediate LASV trimer.
Cryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 293 K / Instrument: FEI VITROBOT MARK IV
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Electron microscopy
Microscope
FEI TITAN KRIOS
Image recording
Film or detector model: GATAN K3 (6k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Average exposure time: 2.0 sec. / Average electron dose: 51.37 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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