pVip-Derived Nucleotide Analogs for Viral Chain Termination
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Solution Overview
Problem
There is a need for new nucleotide chain terminators that can inhibit the replication of viruses and DNA replication of malignant cells, as well as provide bacteria with defense against foreign nucleic acid contamination in industrial fermentation processes.
Innovation Solution
The use of prokaryotic viperin homologs (pVips) and nucleotide/nucleoside analogs, such as ddhA, ddhG, ddhU, ddh-deoxy-A, ddh-deoxy-G, and ddh-deoxy-T, which are derived from pVip enzymes, to terminate polynucleotide chain synthesis and confer viral resistance, anti-viral activity, and inhibit DNA/RNA replication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prokaryotic viperin homologs (pVips) are used to produce nucleotide analogs, then viral resistance and anti-viral activity are improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent employs self-service by utilizing the cell's own metabolic pathways and enzymatic systems to produce the active nucleotide analogs. The pVip enzymes catalyze the conversion of endogenous nucleotides into chain-terminating analogs within the cell, eliminating the need for external synthesis and complex manufacturing processes. This self-service mechanism simplifies production while maintaining high viral resistance efficacy.
2Reliability
If new nucleotide chain terminators are developed to inhibit viral replication, then anti-viral activity is improved, but loss of time and development cost increase
Solution Approach 1:
The patent applies preliminary action by pre-engineering the pVip enzyme system into the bacterial cells before viral infection occurs. The enzymes are expressed and positioned within the cell in advance, creating a pre-formed defensive mechanism that immediately terminates viral nucleotide synthesis upon infection. This eliminates the need for time-consuming trial-and-error development of new inhibitors, as the system is prepared beforehand.
Solution Approach 2:
The pVip enzyme system exhibits universality by producing a broad spectrum of nucleotide analogs (ddhA, ddhG, ddhU, and deoxy forms) that can inhibit multiple types of viruses simultaneously. This multi-functional approach allows a single enzymatic system to provide protection against diverse viral threats, reducing the time and resources needed to develop virus-specific inhibitors for each pathogen.
3Reliability
If bacteria are protected from foreign nucleic acid contamination, then reliability of fermentation process is improved, but use of energy and metabolic burden increase
Solution Approach 1:
The patent converts the harmful foreign nucleic acids (viral genomes, phage contamination) into beneficial signals by utilizing the cell's native nucleotide pool. The pVip enzymes redirect endogenous nucleotides into chain-terminating analogs that specifically target invading viral particles. This approach transforms the metabolic burden of maintaining nucleotide homeostasis into a defensive advantage, protecting fermentation reliability without requiring additional energy-intensive protective mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These compounds effectively terminate DNA/RNA chain synthesis, provide viral resistance, and reduce DNA replication in malignant cells, while protecting bacterial cultures from foreign nucleic acid invasion and phage contamination.
Implementation Method 1
Viperin is an interferon-induced enzyme, which provides broad anti-viral properties against DNA and RNA viruses such as West Nile virus, hepatitis C and HIV. In eukaryotes, Viperin catalyzes the conversion of CTP to ddhCTP via a SAM-dependent radical mechanism.
Implementation Method 2
The main mechanism of nucleoside and nucleotide analogs is competition with the natural substrate for the DNA or RNA polymerization reaction. Upon incorporation of this 'suicide' nucleotide, a chain cannot polymerize further.
Data Source
AI summary
Disclosed herein are prokaryotic homologs of viperin (pVips), and nucleotide and nucleoside analogs produced from pVips. These nucleotide and nucleoside analogs stop nucleotide chain synthesis and provide host cells with resistance to viral infections by targeting actively replicating viral genome. Further, these nucleotide and nucleoside analogs decrease DNA replication in malignant cells. Further disclosed are methods of identifying pVips, and nucleotide and nucleoside analogs produced thereof.