Reversed-phase high-performance liquid chromatographic assay for the adenovirus type 5 proteome

Area of Science:

• Biochemistry
• Analytical Chemistry
• Virology

Background:

• Recombinant adenovirus type 5 is a crucial tool in gene therapy and vaccine development.
• Accurate quantification of adenovirus particles is essential for ensuring efficacy and safety.
• Existing spectrophotometric assays are susceptible to contaminants, limiting their reliability.

Purpose of the Study:

• To develop and validate a robust RP-HPLC assay for quantifying recombinant adenovirus type 5 particles.
• To assess the sensitivity and specificity of the developed assay.
• To compare the performance of the RP-HPLC assay with conventional methods.

Main Methods:

• Development of a reversed-phase high-performance liquid chromatography (RP-HPLC) method for adenovirus type 5.
• Separation and identification of viral structural components (DNA and proteins) using RP-HPLC.
• Characterization of individual components via mass spectrometry, N-terminal sequencing, and amino acid analysis.
• Quantification of adenovirus particles based on structural protein measurements.

Main Results:

• The RP-HPLC assay successfully separated adenovirus type 5 into its constituent DNA and protein components.
• A characteristic proteomic fingerprint was generated, enabling component identification.
• Quantification of individual structural proteins provided independent and accurate measurements of virus concentration.
• The assay demonstrated high sensitivity, with a limit at or below 2 x 10^8 particles.
• The RP-HPLC assay proved insensitive to common contaminants found in partially purified adenovirus preparations.

Conclusions:

• RP-HPLC offers a reliable and sensitive method for quantifying adenovirus type 5 particles.
• The assay's insensitivity to contaminants provides a significant advantage over spectrophotometric methods.
• This validated assay can enhance the quality control of adenovirus-based therapeutics and research tools.