Hammerhead Ribozyme Stem II Modifications for Faster RNA Cleavage

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Solution Overview

Problem

Existing hammerhead ribozymes exhibit limited turnover rates and efficiency in cleaving target RNA sequences, particularly due to constraints in the stem II region and flanking regions, which affect their catalytic activity.

Innovation Solution

The development of hammerhead ribozymes with specific modifications in the stem II region, including the use of nucleic sequences such as AGUA in the stem terminator loop and uracil at position 7 in the flanking regions, enhances the turnover rate and catalytic efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If wild-type hammerhead ribozymes are used, then the basic catalytic function is maintained, but the turnover rate is limited

Engineering Contradiction:

Improveturnover rateVSAvoidcatalytic efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies parameter changes by modifying specific nucleotide sequences in the stem II region and flanking regions. The stem terminator loop is changed to comprise specific sequences (AGUA, UAAA, AAAA, GUGA, GAGA, GAUA, GUUA, GACA, AAAG, AACA, AUUA, AAUA, or AGCA), and a uracil is introduced at position 7 in the first flanking region. These sequence parameter changes result in enhanced turnover rates compared to wild-type ribozymes.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If modifications are made in the stem II region and flanking regions, then the turnover rate is enhanced, but the structural complexity increases

Engineering Contradiction:

Improveturnover rateVSAvoidstructural complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by making specific modifications only in particular regions of the ribozyme structure. The stem terminator loop and first flanking region are modified while other regions remain conserved. This localized modification approach enhances catalytic activity without requiring complete redesign of the entire ribozyme structure, thus managing structural complexity.

Inventive Principle:

Principle #3Local quality

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

The modified hammerhead ribozymes demonstrate significantly improved turnover rates and catalytic activity, outperforming wild-type ribozymes by up to 70% in cleaving target RNA sequences.

Implementation Method 1

hammerhead ribozymes demonstrate significantly improved turnover rates and catalytic activity, outperforming wild-type ribozymes by up to 70% in cleaving target RNA sequences

Methodology Applied

Scientific EffectEnzymatic catalysis: Enzyme

Data Source

PatentUS20250283077A1Enhanced hammerhead ribozymes and methods of use

Publication Date: 2025.09.11 THE UNITED STATES OF AMERICA AS REPRESENTED BY THE DEPT OF VETERANS AFFAIRS

AI summary

Disclosed herein, are hammerhead ribozymes that bind to a target mRNA comprising a NUH ribozyme cleavage site that have enhanced turnover rates. Also described herein, are methods of administering hammerhead ribozymes that bind to a target mRNA comprising a NUH ribozyme cleavage site to treat eye diseases.