Eubacterium rectale Reverse Transcriptase for Long RNA Sequencing
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Solution Overview
Problem
Current reverse transcriptase enzymes are limited by low processivity, making it difficult to obtain accurate sequence information from long or structured RNA molecules, which hampers RNA sequencing and other applications by producing short reads rather than full-length complementary DNA transcripts.
Innovation Solution
Development of a reverse transcriptase enzyme derived from Eubacterium rectale maturase, with specific mutations and modifications such as those in the α-loop, thumb domain, and catalytic site, along with an optimized reaction buffer, to enhance processivity and fidelity, allowing for the efficient conversion of long RNA molecules into full-length cDNA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional reverse transcriptase enzymes are used, then the sequencing process can be performed, but the processivity is low resulting in short reads instead of full-length cDNA transcripts
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid mutations (e.g., E104P, I129Y, I137V, T161R, I168L, I170L, V171I, M337T) in the reverse transcriptase enzyme structure. These mutations modify the enzyme's physical and chemical properties to enhance its processivity and ability to synthesize full-length cDNA from long RNA templates, directly resolving the contradiction between maintaining sequencing capability and improving read length accuracy.
2Reliability
If reverse transcriptase is used to convert RNA to cDNA, then sequence information can be obtained, but errors are introduced reducing fidelity
Solution Approach 1:
The patent introduces specific amino acid substitutions (e.g., A29S, V82I, E104P, I129Y, I137V, T161R, I168L, I170L, V171I, M337T) that modify the enzyme's catalytic properties. These parameter changes enhance the fidelity of reverse transcription by reducing error rates while maintaining the ability to convert RNA to cDNA, thereby resolving the contradiction between reliability and information loss.
3Length of stationary object
If standard reverse transcriptase enzymes are used, then the reaction can proceed, but the enzyme cannot effectively copy very long or structured templates greater than 4000 nucleotides
Solution Approach 1:
The patent employs parameter changes through specific mutations in the enzyme structure (e.g., E104P, I129Y, I137V, T161R, I168L, I170L, V171I, M337T) that enhance the reverse transcriptase's ability to handle long and structured RNA templates. These modifications improve processivity and stability, enabling effective copying of templates exceeding 4000 nucleotides while maintaining copying efficiency.
4Productivity
If commercial RT enzymes are used, then sequencing can be performed, but they produce short reads that confound the ability to monitor linkage between multiple structural and sequence-related changes
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid mutations that extend the read length capability of the reverse transcriptase. This enables the enzyme to produce full-length cDNA transcripts that preserve the linkage information between multiple structural and sequence-related changes, resolving the contradiction between productivity and information loss.
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 reverse transcriptase enzyme achieves enhanced processivity and reduced error rates, enabling the production of longer, accurate cDNA sequences from complex RNA templates, improving RNA sequencing and related applications.
Implementation Method 1
reverse transcriptase (RT) enzymes to produce full-length complementary DNA (cDNA) transcripts
Data Source
AI summary
The present invention provides compositions, methods, and kits related to reverse transcriptases derived from E.r. maturase.