Protein
tRNA-5-methyluridine(54) 2-sulfurtransferase
Organism
Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3)
Function
Catalyzes the ATP-dependent 2-thiolation of 5-methyluridine residue at position 54 in the T loop of tRNAs, leading to 5-methyl-2-thiouridine (m(5)s(2)U or s(2)T) (PubMed:28655838). This modification allows thermal stabilization of tRNAs in thermophilic microorganisms, and is required for cell growth at high temperatures (By similarity). Can use free sulfide as sulfur source in vitro, which may be also the sulfur source in vivo (PubMed:28655838).
Similarity
Belongs to the TtcA family. TtuA subfamily.
Sequence
MKCKFCSREAYIKIHYPKMYLCEEHFKEYFERKVSRTIERYKLLTKDERILVAVSGGKDSAVTAYVLKKLGYNIECLHINLGISGYSEKSEEYAKKQCKLIGAPLHIVRIKEILGYGIGEVKTRRPPCSYCGLTKRYIMNKFAYDNGFDAIATGHNLDDEASFLLNNILHWNTEYLAKGGPILPQQGKFIKKVKPLYEVTEREVVAYALAVGLEYIVEECPYARGATTLDMKGVLNELEEKRPGTKFNFVRGYLKKKKLFEPEIKEKEIKECKICRMPSSGDICAFCKFWGLKKEINFKVSSTDEEPFGP