The hypervariable domain of the murine leukemia virus surface protein tolerates large insertions and deletions, enabling development of a retroviral particle display system.

Important note: Information in this article was accurate in 1999. The state of the art may have changed since the publication date.

The hypervariable domain of the murine leukemia virus surface protein tolerates large insertions and deletions, enabling development of a retroviral particle display system.

J Virol. 1999 Mar;73(3):1802-8. Unique Identifier : AIDSLINE MED/99138957
Kayman SC; Park H; Saxon M; Pinter A; Laboratory of Retroviral Biology, Public Health Research; Institute, New York, New York 10016, USA. skayman@phr.nyu.edu

Abstract: The surface proteins (SU) of murine type-C retroviruses have a central hypervariable domain devoid of cysteine and rich in proline. This 41-amino-acid region of Friend ecotropic murine leukemia virus SU was shown to be highly tolerant of insertions and deletions. Viruses in which either the N-terminal 30 amino acids or the C-terminal 22 amino acids of this region were replaced by the 7-amino-acid sequence ASAVAGA were fully infectious. Insertions of this 7-amino-acid sequence at the N terminus, center, and the C terminus of the hypervariable domain had little effect on envelope protein (Env) function, while this insertion at a position 10 amino acids following the N terminus partially destabilized the association between the SU and transmembrane subunits of Env. Large, complex domains (either a 252-amino-acid single-chain antibody binding domain [scFv] or a 96-amino-acid V1/V2 domain of HIV-1 SU containing eight N-linked glycosylation sites and two disulfides) did not interfere with Env function when inserted in the center or C-terminal portions of the hypervariable domain. The scFv domain inserted into the C-terminal region of the hypervariable domain was shown to mediate binding of antigen to viral particles, demonstrating that it folded into the active conformation and was displayed on the surface of the virion. Both positive and negative enrichment of virions expressing the V1/V2 sequence were achieved by using a monoclonal antibody specific for a conformational epitope presented by the inserted sequence. These results indicated that the hypervariable domain of Friend ecotropic SU does not contain any specific sequence or structure that is essential for Env function and demonstrated that insertions into this domain can be used to extend particle display methodologies to complex protein domains that require expression in eukaryotic cells for glycosylation and proper folding.

Keywords: JOURNAL ARTICLE Amino Acid Sequence Friend Virus/*CHEMISTRY/GENETICS *Gene Therapy *Genetic Vectors Molecular Sequence Data Protein Conformation Structure-Activity Relationship Support, U.S. Gov't, Non-P.H.S. Support, U.S. Gov't, P.H.S. Viral Envelope Proteins/*CHEMISTRY/PHYSIOLOGY Virion/*GENETICS
990530
A9950831

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