Multi-Enzyme Cocktail for One-Step RNA Digestion
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Solution Overview
Problem
Current methods for preparing RNA samples for liquid chromatography tandem mass spectrometry (LC-MS/MS) are time-consuming and require multiple steps, including denaturation and pH adjustments, which can introduce errors and are not suitable for rapid analysis.
Innovation Solution
A single-step digestion method using a combination of micrococcal nuclease, nuclease P1, and bacterial alkaline phosphatase (BAP) enzymes, eliminating the need for denaturation and reducing the preparation time to under four hours, allowing for complete digestion of RNA into individual nucleosides for LC-MS/MS analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional three-step RNA digestion method is used, then complete digestion to nucleosides is achieved, but preparation time is excessive (about 6 hours) and multiple pipetting/pH adjustments introduce errors
Solution Approach 1:
The patent combines three separate enzymatic digestion steps (phosphodiesterase I, phosphodiesterase II, and alkaline phosphatase) into a single multi-enzyme cocktail that performs all digestions simultaneously in one reaction vessel at neutral pH, eliminating sequential processing steps and reducing human intervention errors
Solution Approach 2:
The patent segments the complex three-step digestion process into a unified single-step protocol by dividing the enzyme mixture into separate lyophilized components (enzyme cocktail and buffer) that are reconstituted and applied together, maintaining enzymatic functionality while simplifying the overall procedure
2Ease of operation
If traditional three-step digestion process is used, then RNA is completely hydrolyzed to nucleosides, but the process requires multiple pH adjustments and denaturation steps
Solution Approach 1:
The patent changes the pH parameter from acidic (traditional method requiring pH adjustments) to neutral pH throughout the entire digestion process, allowing all enzymatic reactions to proceed under uniform conditions without denaturation steps or pH adjustments, thereby simplifying operation
Solution Approach 2:
The patent merges multiple separate processing steps (denaturation, phosphodiesterase digestion, phosphatase treatment) into a single combined enzymatic reaction using a multi-enzyme cocktail, reducing the number of operational steps from three to one
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
This approach enables efficient and streamlined RNA digestion, reducing preparation time and minimizing errors, facilitating high-throughput analysis of post-transcriptional modifications without the need for denaturation or multiple pH adjustments, and is suitable for automation in clinical studies.
Implementation Method 1
enzymatically digesting the nucleic acid sample in the enzyme composition to provide a digested nucleoside composition
Implementation Method 2
a single digestion step composed of a formulation of three digestive enzymes
Data Source
AI summary
A kit for preparing a nucleic acid sample for analysis by liquid chromatography tandem mass spectrometry (LC-MS/MS) is provided, the kit comprising: a lyophilized enzyme composition comprising: micrococcal nuclease; nuclease P1; and bacterial alkaline phosphatase (BAP); and a digestion buffer. Also provided are enzyme compositions and methods of use for rapid, efficient preparation of a nucleic acid sample for analysis by LC-MS/MS, without the need for denaturation of the sample.