Histidine—tRNA ligase
| histidine-tRNA ligase | |||||||
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| Identifiers | |||||||
| EC number | 6.1.1.21 | ||||||
| CAS number | 9068-78-4 | ||||||
| Databases | |||||||
| IntEnz | IntEnz view | ||||||
| BRENDA | BRENDA entry | ||||||
| ExPASy | NiceZyme view | ||||||
| KEGG | KEGG entry | ||||||
| MetaCyc | metabolic pathway | ||||||
| PRIAM | profile | ||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||
| Gene Ontology | AmiGO / EGO | ||||||
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In enzymology, a histidine-tRNA ligase (EC 6.1.1.21) is an enzyme that catalyzes the chemical reaction
- ATP + L-histidine + tRNAHis
AMP + diphosphate + L-histidyl-tRNAHis
The 3 substrates of this enzyme are ATP, L-histidine, and tRNA(His), whereas its 3 products are AMP, diphosphate, and L-histidyl-tRNA(His).
This enzyme belongs to the family of ligases, to be specific those forming carbon-oxygen bonds in aminoacyl-tRNA and related compounds. The systematic name of this enzyme class is L-histidine:tRNAHis ligase (AMP-forming). Other names in common use include histidyl-tRNA synthetase, histidyl-transfer ribonucleate synthetase, and histidine translase. This enzyme participates in histidine metabolism and aminoacyl-trna biosynthesis.
Structural studies
As of late 2007, 9 structures have been solved for this class of enzymes, with PDB accession codes 1ADJ, 1ADY, 1H4V, 1HTT, 1KMM, 1KMN, 1QE0, 1WU7, and 1X59.
See also
References
- von Tigerstrom M, Tener GM (1967). "Histidyl transfer ribonucleic acid synthetase from bakers' yeast". Can. J. Biochem. 45 (7): 1067–74. PMID 6035970.
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