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Research Article

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

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

Volume 17, Issue 1, 2019

Page: [42 - 52] Pages: 11

DOI: 10.2174/1570162X17666190506155222

Abstract

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.

Methods: An established HIV-1 latent cell model (J-Lat Tat-GFP Clone A7 cells, A7 cells) and its parental cell line (Jurkat cells) were 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.

Conclusion: We identified 13 proteins in A7 compared to Jurkat cells. CAPG may be a potential biomarker related to HIV latency.

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

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Graphical Abstract

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