Defining substrate specificities of human RNA capping methyltransferases through quantitative assessment of independent yet cooperative activities.

ABSTRACT: Human RNA capping is critical for mRNA splicing, protection of RNA from 5' exonucleases in the cytoplasm, and targeting to the ribosome. Human RNMT, CMTR1, and CMTR2 are RNA methyltransferases involved in the RNA capping process. They play a significant role in the proliferation and differentiation of embryonic stem cells and have been implicated in cancer. Substrate specificities of human RNA capping methyltransferases have been somewhat explored in a few studies. Here, we report on a comprehensive, systematic, and quantitative assessment of their substrate specificities along with SARS-CoV-2 counterparts, nsp14 and nsp16. We discovered novel cooperative activities of human enzymes. We designed and synthesized various RNA substrates with defined patterns of methylation to systematically a

SUBMITTER: Taherian F 

PROVIDER: S-EPMC12723728 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature