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Expanding the RNA polymerase biocatalyst solution space for mRNA manufacture
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  • Edward Curry,
  • Svetlana Sedelnikova,
  • John Rafferty,
  • Martyn Hulley,
  • Adam Brown
Edward Curry
The University of Sheffield
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Svetlana Sedelnikova
The University of Sheffield
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John Rafferty
The University of Sheffield
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Martyn Hulley
AstraZeneca PLC
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Adam Brown
The University of Sheffield

Corresponding Author:[email protected]

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Abstract

All mRNA products are currently manufactured in in vitro transcription (IVT) reactions that utilize single-subunit RNA polymerase (RNAP) biocatalysts. Although it is known that discrete polymerases exhibit highly variable bioproduction phenotypes, including different relative processivity rates and impurity generation profiles, only a handful of enzymes are generally available for mRNA biosynthesis. This limited RNAP toolbox restricts strategies to design and troubleshoot new mRNA manufacturing processes, which is particularly undesirable given the continuing diversification of mRNA product lines towards larger and more complex molecules. Herein, we describe development of a high-throughput RNAP screening platform, comprising complementary in silico and in vitro testing modules, that enables functional characterisation of large enzyme libraries. Utilizing this system, we identified eight novel sequence-diverse RNAPs, with associated active cognate promoters, and subsequently validated their performance as recombinant enzymes in IVT-based mRNA production processes. By increasing the number of available characterized functional RNAPs by > 130% and providing a platform to rapidly identify further potentially useful enzymes, this work significantly expands the RNAP biocatalyst solution space for mRNA manufacture, thereby enhancing capability to achieve application and molecule-specific optimisation of product yield and quality.
Submitted to Biotechnology Journal
17 Feb 2024Review(s) Completed, Editorial Evaluation Pending
17 Feb 2024Editorial Decision: Revise Major
15 May 2024Reviewer(s) Assigned