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Human Immunodeficiency Virus (HIV) Separation And Enrichment Via The Combination Of Antiviral Lectin Recognition And A Thermoresponsive Reagent System

Joseph Phan, B. J. Nehilla, S. Srinivasan, R. Coombs, K. Woodrow, J. Lai
Published 2016 · Chemistry, Medicine

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PurposeIn order to improve the detection limit of existing HIV diagnostic assays, we explored the use of a temperature-responsive magnetic nanoparticle reagent system in conjunction with cyanovirin-N for HIV recognition to rapidly and efficiently concentrate viral particles from larger sample volumes, ~ 1 ml.MethodsCyanovirin-N (CVN) mutant, Q62C, was expressed, biotinylated, and then complexed with a thermally responsive polymer-streptavidin conjugate. Confirmation of protein expression/activity was performed using matrix assisted laser desorption/ionization (MALDI) and a TZM-bl HIV inhibition assay. Biotinylated CVN mutant recognition with gp120 was characterized using surface plasmon resonance (SPR). Virus separation and enrichment using a thermoresponsive magnetic nanoparticle reagent system were measured using RT-PCR.ResultsBiotinylated Q62C exhibited a KD of 0.6 nM to gp120. The temperature-responsive binary reagent system achieved a maximum viral capture of nearly 100% HIV, 1 × 105 virus copies in 100 μl, using pNIPAAm-Q62C within 30 minutes. Additionally, the same reagent system achieved nearly 9-fold enrichment by processing a 10-times larger sample of 1000 μl (Fig. 3).ConclusionThis work demonstrated a temperature-responsive reagent system that provides enrichment of HIV using antiviral lectin CVN for recognition, which is potentially amenable for use in point-of-care settings.
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