Uncleaved prefusion-optimized gp140 trimers derived from analysis of HIV-1 envelope metastability

Year
2016
Type(s)
Authors
Kong, L. He, L. de Val, N. Vora, N. Morris, C. D. Azadnia, P. Sok, Devin Zhou, Bin Burton, Dennis Ward, Andrew Wilson, Ian Zhu, Jiang
Source
Nature Communications 2016 7
Url
http://dx.doi.org/10.1038/ncomms12040

Abstract

The trimeric HIV-1 envelope glycoprotein (Env) is critical for host immune recognition and neutralization. Despite advances in trimer design, the roots of Env trimer metastability remain elusive. Here we investigate the contribution of two Env regions to metastability. First, we computationally redesign a largely disordered bend in heptad region 1 (HR1) of SOSIP trimers that connects the long, central HR1 helix to the fusion peptide, substantially improving the yield of soluble, well-folded trimers. Structural and antigenic analyses of two distinct HR1 redesigns confirm that redesigned Env closely mimics the native, prefusion trimer with a more stable gp41. Next, we replace the cleavage site between gp120 and gp41 with various linkers in the context of an HR1 redesign. Electron microscopy reveals a potential fusion intermediate state for uncleaved trimers containing short but not long linkers. Together, these results outline a general approach for stabilization of Env trimers from diverse HIV-1 strains.

 

Technology Platform

Envelope Trimer Stabilization

Research Topics

HIV-1 Vaccine Development