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Type of publication: Journal Article
Type of document: Full Paper

Year: 2016

Authors: Steppert, P; Burgstaller, D; Klausberger, M; Berger, E; Aguilar, PP; Schneider, TA; Kramberger, P; Tover, A; Nöbauer, K; Razzazi-Fazeli, E; Jungbauer, A

Title: Purification of HIV-1 gag virus-like particles and separation of other extracellular particles.

Source: J Chromatogr A. 2016; 1455:93-101



Authors Vetmeduni Vienna:

Nöbauer Katharina
Razzazi-Fazeli Ebrahim

Vetmed Research Units
VetCore


Abstract:
Enveloped virus-like particles (VLPs) are increasingly used as vaccines and immunotherapeutics. Frequently, very time consuming density gradient centrifugation techniques are used for purification of VLPs. However, the progress towards optimized large-scale VLP production increased the demand for fast, cost efficient and scale able purification processes. We developed a chromatographic procedure for purification of HIV-1 gag VLPs produced in CHO cells. The clarified and filtered cell culture supernatant was directly processed on an anion-exchange monolith. The majority of host cell impurities passed through the column, whereas the VLPs were eluted by a linear or step salt gradient; the major fraction of DNA was eluted prior to VLPs and particles in the range of 100-200nm in diameter could be separated into two fractions. The earlier eluted fraction was enriched with extracellular particles associated to exosomes or microvesicles, whereas the late eluting fractions contained the majority of most pure HIV-1 gag VLPs. DNA content in the exosome-containing fraction could not be reduced by Benzonase treatment which indicated that the DNA was encapsulated. Many exosome markers were identified by proteomic analysis in this fraction. We present a laboratory method that could serve as a basis for rapid downstream processing of enveloped VLPs. Up to 2000 doses, each containing 1×10(9) particles, could be processed with a 1mL monolith within 47min. The method compared to density gradient centrifugation has a 220-fold improvement in productivity. Copyright © 2016 The Authors. Published by Elsevier B.V. All rights reserved.

Keywords Pubmed: Animals
CHO Cells
Centrifugation, Density Gradient
Cricetinae
Cricetulus
HIV-1metabolism
Humans
Microscopy, Electron, Transmission
Nanoparticleschemistry
Recombinant Proteinsbiosynthesisgeneticsisolation & purification
Vaccines, Virus-Like Particlebiosynthesisisolation & purificationultrastructure
gag Gene Products, Human Immunodeficiency Virusgeneticsisolation & purificationmetabolism

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