Structural highlights
Function
DXO_ASHGO Decapping enzyme for NAD-capped RNAs: specifically hydrolyzes the nicotinamide adenine dinucleotide (NAD) cap from a subset of RNAs by removing the entire NAD moiety from the 5'-end of an NAD-capped RNA (By similarity). The NAD-cap is present at the 5'-end of some RNAs and snoRNAs (By similarity). In contrast to the canonical 5'-end N7 methylguanosine (m7G) cap, the NAD cap promotes mRNA decay (By similarity). Also acts as a non-canonical decapping enzyme that removes the entire cap structure of m7G capped or incompletely capped RNAs and mediates their subsequent degradation (PubMed:26101253). Specifically degrades pre-mRNAs with a defective m7G cap and is part of a pre-mRNA capping quality control (PubMed:26101253). Has decapping activity toward incomplete 5'-end m7G cap mRNAs such as unmethylated 5'-end-capped RNA (cap0), while it has no activity toward 2'-O-ribose methylated m7G cap (cap1) (By similarity). Also has 5'-3' exonuclease activity (PubMed:26101253). Also possesses RNA 5'-pyrophosphohydrolase activity by hydrolyzing the 5'-end triphosphate to release pyrophosphates (PubMed:26101253).[UniProtKB:O13836][UniProtKB:O70348][UniProtKB:Q06349][1]
References
- ↑ Wang VY, Jiao X, Kiledjian M, Tong L. Structural and biochemical studies of the distinct activity profiles of Rai1 enzymes. Nucleic Acids Res. 2015 Jun 22. pii: gkv620. PMID:26101253 doi:http://dx.doi.org/10.1093/nar/gkv620
