Plasma Membrane Proteomic Profile Discovers Macrophage-capping Protein Related to Latent HIV-1

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Author(s): Yujiao Zhang, Yinzhong Shen, Lin Yin, Tangkai Qi, Xiaofang Jia, Hongzhou Lu, Lijun Zhang*.

Journal Name: Current HIV Research

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Background: Due to the persistence of latent HIV-infected cellular reservoirs, HIV virus can not be eradicated completely.

Objective: To identify proteins related to HIV latency, we performed a subcellular proteomic study in HIV latent cell lines.

Method: An established HIV-1 latent cell model (J-Lat Tat-GFP Clone A7 cells, A7 cells) and its parental cell line (Jurkat cells) was used. The plasma membrane (PM) fraction from cultured cells was enriched through aqueous two-phase partition. PM proteins were extracted and then separated using two-dimensional electrophoresis (2DE). Differentially expressed proteins were identified by mass spectrometry, and verified by western blotting.

Results: Thirteen non-redundant proteins were identified to be differentially expressed in the A7 PM fraction compared to those in the Jurkat PM. Eight had a PM location through Gene Ontology (GO) analysis. A differential protein network of CAPG-ACTR3-CD3D was detected to have interactions with HIV Vpr, Tat, gp160, etc through STRING software analysis. One of the differential proteins (Macrophage-capping protein (CAPG)) was verified by western blotting to be down- regulated in two cell lines and HIV resting CD4+ T cells negatively selected from patients.

Keywords: HIV, latency, proteomics, plasma membrane, CAPG, resting CD4+ T cells, reservoir

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(E-pub Ahead of Print)
DOI: 10.2174/1570162X17666190506155222

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