Threonine–tRNA ligase 1, cytoplasmic, also called threonyl-tRNA synthetase 1, is an enzyme that in humans is encoded by the TARS1gene.[5] Like its relatives, TARS2 and TARS3, this enzyme functions as a threonine–tRNA ligase,[5][6] which means it attaches the animo acid threonine to its corresponding transfer RNA as part of RNA-to-protein translation.[7]
Aminoacyl tRNA synthetases catalyze the aminoacylation of tRNA by their cognate amino acid. Because of their central role in linking amino acids with nucleotide triplets contained in tRNAs, aminoacyl-tRNA synthetases are thought to be among the first proteins that appeared in evolution. Threonyl-tRNA synthetase belongs to the class-II aminoacyl-tRNA synthetase family.[5]
Cytoplasmic threonine–tRNA ligase is unique in vertebrate aminoacyl-tRNA synthetases in having a second form, TARS3 (previously called TARSL2), evolved from a gene duplication.[8] In mice, the TARS1 enzyme is significantly more prevalent (55x in lungs, and 3x in muscles).[9] Structurally, TARS1 functions as a homodimer,[10] while TARS3 may instead be a component of the protein complex: multisynthetase complex (MSC).[9] TARS1 is also smaller, 83 kD vs. 93 kD, and this has been used to infer that it is the primary target of the antibodies involved in antisynthetase syndrome.[9]
Pathogenic (homozygous and compound heterozygous) mutations in TARS1 are associated with trichothiodystrophy (a type of hair fragility disorder), with the type caused by TARS1 mutation designated as: nonphotosensitive trichothiodystrophy-7 (TTD7).[11]
Gerken SC, Wasmuth JJ, Arfin SM (1986). "Threonyl-tRNA synthetase gene maps close to leucyl-tRNA synthetase gene on human chromosome 5". Somat. Cell Mol. Genet. 12 (5): 519–22. doi:10.1007/BF01539923. PMID3464105. S2CID32380159.
Pan F, Lee HH, Pai SH, Lo KY (1982). "Purification and subunit structure studies of human placental threonyl-tRNA synthetase". Int. J. Pept. Protein Res. 19 (3): 300–9. doi:10.1111/j.1399-3011.1982.tb03042.x. PMID7118399.
Pan F, Lo KY, Pai SH, Lee HH (1982). "Kinetic mechanism of threonyl-tRNA synthetase from human placenta". Int. J. Pept. Protein Res. 20 (2): 159–66. doi:10.1111/j.1399-3011.1982.tb02670.x. PMID7118437.
Ogata K, Kurahashi A, Nishiyama C, Terao K (1994). "Presence of role of the 5SrRNA-L5 protein complex (5SRNP) in the threonyl- and histidyl-tRNA synthetase complex in rat liver cytosol". Biochim. Biophys. Acta. 1218 (3): 388–400. doi:10.1016/0167-4781(94)90192-9. PMID8049265.
Maruyama K, Sugano S (1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID8125298.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, etal. (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID9373149.
Vasilescu J, Zweitzig DR, Denis NJ, etal. (2007). "The proteomic reactor facilitates the analysis of affinity-purified proteins by mass spectrometry: application for identifying ubiquitinated proteins in human cells". J. Proteome Res. 6 (1): 298–305. CiteSeerX10.1.1.401.4220. doi:10.1021/pr060438j. PMID17203973. {{cite journal}}: Cite uses deprecated parameter |citeseerx= (help)
