RNA pyrophosphohydrolase

UniProtKB accession:  P0A776

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UniProtKB description:  Master regulator of 5'-end-dependent mRNA decay (PubMed:18202662). Accelerates the degradation of transcripts by removing pyrophosphate from the 5'-end of triphosphorylated RNA, leading to a more labile monophosphorylated state that can stimulate subsequent ribonuclease cleavage (PubMed:18202662). Preferentially hydrolyzes diadenosine penta-phosphate with ATP as one of the reaction products (PubMed:11479323). Also able to hydrolyze diadenosine hexa- and tetra-phosphate (PubMed:11479323). Has no activity on diadenosine tri-phosphate, ADP-ribose, NADH and UDP-glucose (PubMed:11479323). In an RNase PH (rph) wild-type strain background, RppH is not required for maturation of tRNAs; however, strains with the truncated rph allele (for example K12 W1485 and its derivatives MG1655 and W3110) require RppH for maturation of certain monocistronic tRNAs with short (<5 nucleotides) leader sequences (PubMed:28808133). In the meningitis causing strain E.coli K1, has been shown to play a role in HBMEC (human brain microvascular endothelial cells) invasion in vitro (PubMed:10760174).