Nef Enhances HIV-1 Replication and Infectivity Independently of SERINC5 in CEM T Cells

Overview

Journal Virology

Specialty Microbiology

Date 2022 Dec 28

PMID 36577173

Authors

Peter W Ramirez

Thomas Vollbrecht

Francisco M Acosta

Marissa Suarez

Aaron O Angerstein

Jared Wallace

Ryan M O Connell

John Guatelli

Affiliations

Soon will be listed here.

Abstract

A primary function of HIV-1 Nef is the enhancement of viral infectivity and replication. Whether counteraction of the antiretroviral proteins SERINC3 and SERINC5 is the cause of this positive influence on viral growth-rate and infectivity remains unclear. Here, we utilized CRISPR/Cas9 to knockout SERINC3 and SERINC5 in a leukemic CD4-positive T cell line (CEM) that displays nef-related infectivity and growth-rate phenotypes. Viral replication was attenuated in CEM cells infected with HIV-1 lacking Nef (HIV-1ΔNef). This attenuated growth-rate phenotype was observed regardless of whether the coding regions of the serinc3 or serinc5 genes were intact. Moreover, knockout of serinc5 alone or of both serinc5 and serinc3 together failed to restore the infectivity of HIV1ΔNef virions produced from infected CEM cells. Our results corroborate a similar study using another T-lymphoid cell line (MOLT-3) and indicate that the antagonism of SERINC3 and SERINC5 does not fully explain the virology of HIV-1 lacking Nef.

Citing Articles

SERINC5 counters retroviruses and non-retroviruses.

Yu J, Liu C, Qu X, Gao X, Liu Y Front Cell Infect Microbiol. 2025; 14:1516806.

PMID: 39902183 PMC: 11788155. DOI: 10.3389/fcimb.2024.1516806.

Beyond Impairment of Virion Infectivity: New Activities of the Anti-HIV Host Cell Factor SERINC5.

Sid Ahmed S, Bajak K, Fackler O Viruses. 2024; 16(2).

PMID: 38400059 PMC: 10892966. DOI: 10.3390/v16020284.

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