An HIV-1 Envelope Glycoprotein Trimer with an Embedded IL-21 Domain Activates Human B CellsReport as inadecuate




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Broadly neutralizing antibodies bNAbs that target the HIV-1 envelope glycoproteins Env can prevent virus acquisition, but several Env properties limit its ability to induce an antibody response that is of sufficient quantity and quality. The immunogenicity of Env can be increased by fusion to co-stimulatory molecules and here we describe novel soluble Env trimers with embedded interleukin-4 IL-4 or interleukin-21 IL-21 domains, designed to activate B cells that recognize Env. In particular, the chimeric EnvIL-21 molecule activated B cells efficiently and induced the differentiation of antibody secreting plasmablast-like cells. We studied whether we could increase the activity of the embedded IL-21 by designing a chimeric IL-21-IL-4 ChimIL-21-4 molecule and by introducing amino acid substitutions in the receptor binding domain of IL-21 that were predicted to enhance its binding. In addition, we incorporated IL-21 into a cleavable Env trimer and found that insertion of IL-21 did not impair Env cleavage, while Env cleavage did not impair IL-21 activity. These studies should guide the further design of chimeric proteins and EnvIL-21 may prove useful in improving antibody responses against HIV-1.



Author: Gözde Isik, Nancy P. Y. Chung, Thijs van Montfort, Sergey Menis, Katie Matthews, William R. Schief, John P. Moore, Rogier W. San

Source: http://plos.srce.hr/



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