Endoribonucleolytic Cleavage of m6A-Containing RNAs by RNase P/MRP Complex

• DOI: 10.1016/j.molcel.2019.02.034
• Publication Date: 2019-03-28T14:35:14Z
• Authors: Ok Hyun Park; Hongseok Ha; Yujin Lee; Sung Ho Boo; Do Hoon Kwon; Hyun Kyu Song; Yoon Ki Kim
• Keywords: Cleavage (geology); Ribonuclease III; Argonaute; Small nucleolar RNA

N6-methyladenosine (m6A) is the most abundant internal modification in RNAs and plays regulatory roles in a variety of biological and physiological processes. Despite its important roles, the molecular mechanism underlying m6A-mediated gene regulation is poorly understood. Here, we show that m6A-containing RNAs are subject to endoribonucleolytic cleavage via YTHDF2 (m6A reader protein), HRSP12 (adaptor protein), and RNase P/MRP (endoribonucleases). We demonstrate that HRSP12 functions as an adaptor to bridge YTHDF2 and RNase P/MRP, eliciting rapid degradation of YTHDF2-bound RNAs. Transcriptome-wide analyses show that m6A RNAs that are preferentially targeted for endoribonucleolytic cleavage have an HRSP12-binding site and a RNase P/MRP-directed cleavage site upstream and downstream of the YTHDF2-binding site, respectively. We also find that a subset of m6A-containing circular RNAs associates with YTHDF2 in an HRSP12-dependent manner and is selectively downregulated by RNase P/MRP. Thus, our data expand the known functions of RNase P/MRP to endoribonucleolytic cleavage of m6A RNAs.