mRNA Guanylyltransferase

mRNA Guanylyltransferase can be used for the enzymatic addition of a 7-methylguanylate cap (Cap-0, m7 G-ppp-RNA) structure to the 5′ end of RNA molecules. The Cap-0 structure is formed enzymatically from 5′-triphosphorylated RNA (ppp-RNA; from native or in vitro transcriptions, or chemical synthesis) by mRNA Guanylyltransferase. This enzyme catalyzes three sequential reactions: triphosphatase (TPase), guanylyltransferase (GTase), and methyltransferase (MTase), consuming GTP and S-Adenosylmethionine (SAM) in the process. 5′-cap structures of mRNA are key to transcript stability, supporting translation and function, and reducing immunogenicity and degradation to achieve stable protein expression.

Capping of RNA Molecules: mRNA Guanylyltransferase is employed for the enzymatic addition of a 7-methylguanylate cap (Cap-0, m7 G-ppp-RNA) to the 5′ end of RNA molecules. This process is crucial for modifying 5′-triphosphorylated RNA (ppp-RNA) derived from native or in vitro transcriptions, or chemical synthesis.Mechanistic Studies: The enzyme catalyzes three sequential reactions: triphosphatase (TPase), guanylyltransferase (GTase), and methyltransferase (MTase). These reactions can be studied to understand the mechanisms of capping and the roles of GTP and S-Adenosylmethionine (SAM) in the capping process.Transcript Stability Investigations: The impact of 5′-cap structures on the stability of mRNA transcripts can be analyzed. By comparing capped and uncapped RNA, insights into the protective roles of the cap in preventing degradation can be obtained.Translation Efficiency Studies: The addition of Cap-0 is essential for facilitating translation initiation. Experiments can be conducted to assess how the presence of this cap structure influences ribosome binding and overall translation efficiency.Immunogenicity Assessments: Understanding the immunogenic response of mRNA is important for therapeutic applications. The role of 5′-cap structures in reducing immunogenicity and enhancing stability can be explored through various in vitro and in vivo models.