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Expression, intracellular targeting and purification of HIV Nef variants in tobacco cells

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Marusic, Carla, Nuttall, James, Buriani, Giampaolo , Lico, Chiara, Lombardi, Raffaele , Baschieri , Selene, Benvenuto, Eugenio and Frigerio, Lorenzo. (2007) Expression, intracellular targeting and purification of HIV Nef variants in tobacco cells. BMC Biotechnology, Vol.7 (No.12). ISSN 1472-6750

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Official URL: http://dx.doi.org/10.1186/1472-6750-7-12

Abstract

Background Plants may represent excellent alternatives to classical heterologous protein expression systems, especially for the production of biopharmaceuticals and vaccine components. Modern vaccines are becoming increasingly complex, with the incorporation of multiple antigens. Approaches towards developing an HIV vaccine appear to confirm this, with a combination of candidate antigens. Among these, HIV-Nef is considered a promising target for vaccine development because immune responses directed against this viral protein could help to control the initial steps of viral infection and to reduce viral loads and spreading. Two isoforms of Nef protein can be found in cells: a full-length N-terminal myristoylated form (p27, 27 kDa) and a truncated form (p25, 25 kDa). Here we report the expression and purification of HIV Nef from transgenic tobacco. Results We designed constructs to direct the expression of p25 and p27 Nef to either the cytosol or the secretory pathway. We tested these constructs by transient expression in tobacco protoplasts. Cytosolic Nef polypeptides are correctly synthesised and are stable. The same is not true for Nef polypeptides targeted to the secretory pathway by virtue of a signal peptide. We therefore generated transgenic plants expressing cytosolic, full length or truncated Nef. Expression levels were variable, but in some lines they averaged 0.7% of total soluble proteins. Hexahistidine-tagged Nef was easily purified from transgenic tissue in a one-step procedure. Conclusion We have shown that transient expression can help to rapidly determine the best cellular compartment for accumulation of a recombinant protein. We have successfully expressed HIV Nef polypeptides in the cytosol of transgenic tobacco plants. The proteins can easily be purified from transgenic tissue.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology > QR355 Virology
Divisions:	Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010)
Library of Congress Subject Headings (LCSH):	HIV (Viruses), Tobacco, Plant protoplasts
Journal or Publication Title:	BMC Biotechnology
Publisher:	BioMed Central Ltd.
ISSN:	1472-6750
Date:	26 February 2007
Volume:	Vol.7
Number:	No.12
Identification Number:	10.1186/1472-6750-7-12
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Sixth Framework Programme (European Commission) (FP6)
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URI:	http://wrap.warwick.ac.uk/id/eprint/564