Endoribonuclease active on single-stranded mRNA. Inhibits protein synthesis by cleavage of mRNA [1]. Previously thought to inhibit protein synthesis initiation [2]. This protein may also be involved in the regulation of purine biosynthesis [3]. YjgF (renamed RidA) family members are enamine/imine deaminases. They hydrolyze reactive intermediates released by PLP-dependent enzymes, including threonine dehydratase [5]. YjgF also prevents inhibition of transaminase B (IlvE) in Salmonella [4].

1: Ribonuclease activity of rat liver perchloric acid-soluble protein, a potent inhibitor of protein synthesis. Morishita R, Kawagoshi A, Sawasaki T, Madin K, Ogasawara T, Oka T, Endo Y; J Biol Chem 1999;274:20688-20692. PMID:10400702

2: Isolation and characterization of a novel perchloric acid-soluble protein inhibiting cell-free protein synthesis. Oka T, Tsuji H, Noda C, Sakai K, Hong YM, Suzuki I, Munoz S, Natori Y; J Biol Chem 1995;270:30060-30067. PMID:8530410

3: A role for a highly conserved protein of unknown function in regulation of Bacillus subtilis purA by the purine repressor. Rappu P, Shin BS, Zalkin H, Mantsala P; J Bacteriol 1999;181:3810-3815. PMID:10368157

4: Reduced transaminase B (IlvE) activity caused by the lack of yjgF is dependent on the status of threonine deaminase (IlvA) in Salmonella enterica serovar Typhimurium. Schmitz G, Downs DM; J Bacteriol. 2004;186:803-810. PMID:14729707

5: Conserved YjgF Protein Family Deaminates Reactive Enamine/Imine Intermediates of Pyridoxal 5'-Phosphate (PLP)-dependent Enzyme Reactions. Lambrecht JA, Flynn JM, Downs DM; J Biol Chem. 2012;287:3454-3461. PMID:22094463

6: Mycobacterium tuberculosis Rv2704 is a member of the YjgF/YER057c/UK114 family. Thakur KG, Praveena T, Gopal B; Proteins. 2010;78:773-778. PMID:19899170