Avian leukosis virus is a versatile eukaryotic platform for polypeptide display

Area of Science:

• Biotechnology
• Molecular Biology
• Virology

Background:

• Display technology involves creating libraries of biomolecules for screening.
• Retroviruses are suitable eukaryotic viral platforms for polypeptide display.
• Eukaryotic expression systems are crucial for proper protein folding and modification.

Purpose of the Study:

• To evaluate avian leukosis virus (ALV) as a display platform for nonviral polypeptides.
• To demonstrate the feasibility of genetically fusing polypeptides to the ALV envelope glycoprotein.
• To assess the functionality and stability of displayed polypeptides on viral surfaces.

Main Methods:

• Genetic fusion of polypeptides to the N-terminus of the ALV envelope glycoprotein.
• Construction of an ALV infectious clone with an alkaline phosphatase reporter gene.
• Incorporation of chimeric envelope glycoproteins into virions and assessment of display stability through replication cycles.

Main Results:

• Chimeric envelope glycoproteins were efficiently incorporated into ALV virions.
• Polypeptides were stably displayed on the virion surface across multiple replication cycles.
• Displayed polypeptides remained functional, mediating virus attachment to cognate receptors without interfering with ALV functions.

Conclusions:

• Avian leukosis virus (ALV) is an ideal platform for polypeptide display.
• The ALV system supports expression, folding, and posttranslational modification in eukaryotic cells.
• This platform facilitates the generation and selection of functional polypeptide libraries.