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methionyl-tRNA synthetase C-terminal region/beta chain The methionyl-tRNA synthetase (metG) is a class I amino acyl-tRNA ligase. This model describes a region of the methionyl-tRNA synthetase that is present at the C-terminus of MetG in some species (E. coli, B. subtilis, Thermotoga maritima, Methanobacterium thermoautotrophicum), and as a separate beta chain in Aquifex aeolicus. It is absent in a number of other species (e.g. Mycoplasma genitalium, Mycobacterium tuberculosis), while Pyrococcus horikoshii has both a full length MetG and a second protein homologous to the beta chain only. Proteins hit by this model should be called methionyl-tRNA synthetase beta chain if and only if the model metG hits a separate protein not also hit by this model. [Protein synthesis, tRNA aminoacylation] |
Jiyao W et al.(2023). "The conserved domain database in 2023.",