O-phospho-L-serine—tRNA ligase

O-phospho-L-serine---tRNA ligase (EC 6.1.1.27, O-phosphoseryl-tRNA ligase, non-canonical O-phosphoseryl-tRNA synthetase, SepRS) is an enzyme with systematic name O-phospho-L-serine:tRNACys ligase (AMP-forming).^[1]^[2] This enzyme catalyses the following chemical reaction

ATP + O-phospho-L-serine + tRNACys

\rightleftharpoons

AMP + diphosphate + O-phospho-L-seryl-tRNACys

In organisms like Archaeoglobus fulgidus, this enzyme ligates O-phosphoserine to tRNACys.

References

↑ Fukunaga, R. and Yokoyama, S. (2007). "Structural insights into the first step of RNA-dependent cysteine biosynthesis in archaea". Nat. Struct. Mol. Biol. 14 (4): 272–279. doi:10.1038/nsmb1219. PMID 17351629.
↑ Hauenstein, S.I. and Perona, J.J. (2008). "Redundant synthesis of cysteinyl-tRNA^Cys in Methanosarcina mazei". J. Biol. Chem. 283: 22007–22017. doi:10.1074/jbc.M801839200. PMC 2494925. PMID 18559341.

External links

O-phospho-L-serine---tRNA ligase at the US National Library of Medicine Medical Subject Headings (MeSH)

Enzymes: CO CS and CN ligases (EC 6.1-6.3)

6.1: Carbon-Oxygen	Aminoacyl tRNA synthetase Alanine Arginine Asparagine Aspartate Cysteine D-alanine—poly(phosphoribitol) ligase Glutamate Glutamine Glycine Histidine Isoleucine Leucine Lysine Methionine Phenylalanine Proline Serine Threonine Tryptophan Tyrosine Valine

6.2: Carbon-Sulfur	Succinyl coenzyme A synthetase Acetyl—CoA synthetase Long-chain-fatty-acid—CoA ligase

6.3: Carbon-Nitrogen	Glutamine synthetase Ubiquitin ligase Cullin Von Hippel–Lindau tumor suppressor UBE3A Mdm2 Anaphase-promoting complex UBR1 Glutathione synthetase CTP synthetase Adenylosuccinate synthase Argininosuccinate synthase Holocarboxylase synthetase GMP synthase Asparagine synthetase Carbamoyl phosphate synthetase I II Glutamate–cysteine ligase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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