Protein: Threonine--tRNA ligase catalytic subunit (EC 6.1.1.3) (Threonyl-tRNA synthetase catalytic subunit) (ThrRS-cat) (Q97VW8)
Organism: Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2) (Sulfolobus solfataricus)
Function: Catalyzes the attachment of threonine to tRNA(Thr) in a two-step reaction: L-threonine is first activated by ATP to form Thr-AMP and then transferred to the acceptor end of tRNA(Thr). Also activates L-serine and transfers it to tRNA(Thr); unlike most archaea the editing function is found in a freestanding protein (ACQ980D1). In vitro when both subunits are present, or if the 2 subunits are fused, L-seryl-tRNA(Thr) is no longer produced, the 2 subunits edit incorrectly charged L-seryl-tRNA(Thr). Has no activity on correctly acylated L-seryl-tRNA(Ser) or L-threonyl-tRNA(Thr).
Subcellular location: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00184}.
Sequence: MESYKPVWLKGAVILAINLIDKGYKPVAVGLGERDFYIDVKSDTSITLDEVKKAINENVLANVSIENNQIVYKGNKVSIIEDKVSISTNLNPKYFEILNISTHHPNPNEQYVRIRGVAFETEEQLKDYLSWLEKAEETDHRLIGEKLDLFSFHEEAGSGLVLFHPKGQTIRNELIAFMREINDSMGYQEVYTSHVFKTDIWKISGHYTLYRDKLIVFNMEGDEYGVKPMNCPAHILIYKSKPRTYRDLPIRFSEFGHVYRWEKKGELYGLLRVRGFVQDDGHIFLREDQLREEIKMLISKTVEVWHKFGFKDDDIKPYLSTRPDESIGSDELWEKATNALISALQESGLKFGIKEKEGAFYGPKIDFEIRDSLGRWWQLSTIQVDFNLPERFKLEYIDKDGIKKRPVMVHRAIYGSIDRFVAILLEHFKGKLPTWLSSVQVRVLPITDEVNEYAEKVLNDMRKRRIRAEIDYAGETLSKRIKNAYDQGVPYILIVGKKEASEGTVTVRARGNIEVRNVKFEKFLELLITEIAQRDVEQTTVKALK
InterPro domains: - IPR047246: Threonine-tRNA ligase, class IIa, anticodon-binding domain (domain) [439-527]
- IPR036621: Anticodon-binding domain superfamily (homologous_superfamily) [431-543]
- IPR033728: Threonine-tRNA ligase catalytic core domain (domain) [139-437]
- IPR045864: Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL) (homologous_superfamily) [118-430]
- IPR004154: Anticodon-binding (domain) [440-527]
- IPR002320: Threonine-tRNA ligase, class IIa (family) [3-533]
- IPR006195: Aminoacyl-tRNA synthetase, class II (domain) [127-433]
- IPR018163: Threonyl/alanyl tRNA synthetase, class II-like, putative editing domain superfamily (homologous_superfamily) [16-137]
- IPR002314: Aminoacyl-tRNA synthetase, class II (G/ P/ S/T) (domain) [220-428]
Interaction partners: - Valine--tRNA ligase
- Threonine--tRNA ligase editing subunit
- Probable translation initiation factor IF-2
- Arginine--tRNA ligase
- Isoleucine--tRNA ligase
- Serine--tRNA ligase
- Elongation factor 2
- Large ribosomal subunit protein uL11
- Large ribosomal subunit protein uL2
- Small ribosomal subunit protein uS12
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0003824 (catalytic activity), GO:0016874 (ligase activity), GO:0140640 (catalytic activity, acting on a nucleic acid), GO:0140098 (catalytic activity, acting on RNA), GO:0016875 (ligase activity, forming carbon-oxygen bonds), GO:0004812 (aminoacyl-tRNA ligase activity), GO:0140101 (catalytic activity, acting on a tRNA)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0009987 (cellular process), GO:0009058 (biosynthetic process), GO:0044237 (cellular metabolic process), GO:0044281 (small molecule metabolic process), GO:0006807 (nitrogen compound metabolic process), GO:0071704 (organic substance metabolic process), GO:0044238 (primary metabolic process), GO:1901360 (organic cyclic compound metabolic process), GO:1901564 (organonitrogen compound metabolic process), GO:1901576 (organic substance biosynthetic process), GO:0006139 (nucleobase-containing compound metabolic process), GO:0046483 (heterocycle metabolic process), GO:0006082 (organic acid metabolic process), GO:0019538 (protein metabolic process), GO:0044249 (cellular biosynthetic process), GO:0006520 (amino acid metabolic process), GO:0006725 (cellular aromatic compound metabolic process), GO:0034641 (cellular nitrogen compound metabolic process), GO:0043603 (amide metabolic process), GO:0044260 (cellular macromolecule metabolic process), GO:0043170 (macromolecule metabolic process), GO:1901566 (organonitrogen compound biosynthetic process), GO:0006412 (translation), GO:0009059 (macromolecule biosynthetic process), GO:0006518 (peptide metabolic process), GO:0090304 (nucleic acid metabolic process), GO:0043436 (oxoacid metabolic process), GO:0043604 (amide biosynthetic process), GO:0044271 (cellular nitrogen compound biosynthetic process), GO:0034645 (cellular macromolecule biosynthetic process), GO:0043038 (amino acid activation), GO:0010467 (gene expression), GO:0019752 (carboxylic acid metabolic process), GO:0016070 (RNA metabolic process), GO:0043043 (peptide biosynthetic process), GO:0006418 (tRNA aminoacylation for protein translation), GO:0043039 (tRNA aminoacylation), GO:0034660 (ncRNA metabolic process), GO:0006399 (tRNA metabolic process)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005737 (cytoplasm), GO:0043229 (intracellular organelle), GO:0005739 (mitochondrion), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle)