InterPro : IPR014758

Name  Methionyl-tRNA synthetase Short Name  Met-tRNA_synth
Type  Family Description  The aminoacyl-tRNA synthetase (also known as aminoacyl-tRNA ligase) catalyse the attachment of an amino acid to its cognate transfer RNA molecule in a highly specific two-step reaction. These proteins differ widely in size and oligomeric state, and have limited sequence homology []. The 20 aminoacyl-tRNA synthetases are divided into two classes, I and II. Class I aminoacyl-tRNA synthetases contain a characteristic Rossman fold catalytic domain and are mostly monomeric []. Class II aminoacyl-tRNA synthetases share an anti-parallel beta-sheet fold flanked by alpha-helices [], and are mostly dimeric or multimeric, containing at least three conserved regions [, , ]. However, tRNA binding involves an alpha-helical structure that is conserved between class I and class II synthetases. In reactions catalysed by the class I aminoacyl-tRNA synthetases, the aminoacyl group is coupled to the 2'-hydroxyl of the tRNA, while, in class II reactions, the 3'-hydroxyl site is preferred. The synthetases specific for arginine, cysteine, glutamic acid, glutamine, isoleucine, leucine, methionine, tyrosine, tryptophan and valine belong to class I synthetases. The synthetases specific for alanine, asparagine, aspartic acid, glycine, histidine, lysine, phenylalanine, proline, serine, and threonine belong to class-II synthetases. Based on their mode of binding to the tRNA acceptor stem, both classes of tRNA synthetases have been subdivided into three subclasses, designated 1a, 1b, 1c and 2a, 2b, 2c.Methionine-tRNA ligase () is an alpha 2 dimer. In some species (archaea, eubacteria and eukaryotes) a coding sequence,similar to the C-terminal end of MetRS, is present as an independent gene which is a tRNA binding domain as a dimer. In eubacteria, MetRS can also be split in two sub-classes corresponding to the presence of one or two CXXC domainsspecific to zinc binding. The crystal structures of a number of methionine-tRNA ligases are known [, , ].

Sequence Features

GO Displayer


InterPro protein domain ID --> Contigs



2 Child Features

Id Name Short Name Type
IPR023457 Methionine-tRNA synthetase, type 2 Met-tRNA_synth_2 Family
IPR023458 Methionine-tRNA ligase, type 1 Met-tRNA_ligase_1 Family

1 Contains

Id Name Short Name Type
IPR001412 Aminoacyl-tRNA synthetase, class I, conserved site aa-tRNA-synth_I_CS Conserved_site

0 Found In

1 Parent Features

Id Name Short Name Type
IPR015413 Methionyl/Leucyl tRNA synthetase Methionyl/Leucyl_tRNA_Synth Family

8 Publications

First Author Title Year Journal Volume Pages
Perona JJ Structural basis for transfer RNA aminoacylation by Escherichia coli glutaminyl-tRNA synthetase. 1993 Biochemistry 32 8758-71
Delarue M The aminoacyl-tRNA synthetase family: modules at work. 1993 Bioessays 15 675-87
Cusack S Sequence, structural and evolutionary relationships between class 2 aminoacyl-tRNA synthetases. 1991 Nucleic Acids Res 19 3489-98
Schimmel P Classes of aminoacyl-tRNA synthetases and the establishment of the genetic code. 1991 Trends Biochem Sci 16 1-3
Sugiura I The 2.0 A crystal structure of Thermus thermophilus methionyl-tRNA synthetase reveals two RNA-binding modules. 2000 Structure 8 197-208
Eriani G Partition of tRNA synthetases into two classes based on mutually exclusive sets of sequence motifs. 1990 Nature 347 203-6
Brunie S Crystallographic study at 2.5 A resolution of the interaction of methionyl-tRNA synthetase from Escherichia coli with ATP. 1990 J Mol Biol 216 411-24
Mechulam Y Crystal structure of Escherichia coli methionyl-tRNA synthetase highlights species-specific features. 1999 J Mol Biol 294 1287-97

To cite PlanMine, please refer to the following publication:

Rozanski, A., Moon, H., Brandl, H., Martín-Durán, J. M., Grohme, M., Hüttner, K., Bartscherer, K., Henry, I., & Rink, J. C.
PlanMine 3.0—improvements to a mineable resource of flatworm biology and biodiversity
Nucleic Acids Research, gky1070. doi:10.1093/nar/gky1070 (2018)