The Enzyme Database

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Accepted name: tRNA-5-methyluridine54 2-sulfurtransferase
Reaction: ATP + [TtuB sulfur-carrier protein]-Gly-NH-CH2-C(O)SH + 5-methyluracil54 in tRNA + H2O = AMP + diphosphate + 5-methyl-2-thiouracil54 in tRNA + [TtuB sulfur-carrier protein]-Gly-Gly
Other name(s): TtuA
Systematic name: [TtuB sulfur-carrier protein]-Gly-NH-CH2-C(O)SH:tRNA (5-methyluridine54-2-O)-sulfurtransferase
Comments: The enzyme, found in thermophilic bacteria and archaea, modifies the ribothymidine (5-methyluridine) residue at position 54 of tRNAs. Contains zinc and an [4Fe-4S] cluster. Some organisms, such as the archaeon Pyrococcus horikoshii, do not have a TtuB sulfur-carrier protein, and appear to use sulfide as the sulfur source.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB
1.  Shigi, N., Sakaguchi, Y., Suzuki, T. and Watanabe, K. Identification of two tRNA thiolation genes required for cell growth at extremely high temperatures. J. Biol. Chem. 281 (2006) 14296–14306. [DOI] [PMID: 16547008]
2.  Shigi, N., Suzuki, T., Terada, T., Shirouzu, M., Yokoyama, S. and Watanabe, K. Temperature-dependent biosynthesis of 2-thioribothymidine of Thermus thermophilus tRNA. J. Biol. Chem. 281 (2006) 2104–2113. [DOI] [PMID: 16317006]
3.  Nakagawa, H., Kuratani, M., Goto-Ito, S., Ito, T., Katsura, K., Terada, T., Shirouzu, M., Sekine, S., Shigi, N. and Yokoyama, S. Crystallographic and mutational studies on the tRNA thiouridine synthetase TtuA. Proteins 81 (2013) 1232–1244. [DOI] [PMID: 23444054]
4.  Chen, M., Narai, S., Omura, N., Shigi, N., Chimnaronk, S., Tanaka, Y. and Yao, M. Crystallographic study of the 2-thioribothymidine-synthetic complex TtuA-TtuB from Thermus thermophilus. Acta Crystallogr. F Struct. Biol. Commun. 72 (2016) 777–781. [DOI] [PMID: 27710943]
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