Abstract
Detailed comparisons between the structures of the tRNA-bound Escherichia coli glutaminyl-tRNA (Gln-tRNA) synthetase [L-glutamine:tRNA(Gln) ligase (AMP-forming), EC 6.1.1.18] and recently refined E. coli methionyl-tRNA (Met-tRNA) synthetase [L-methionine:tRNA(Met) ligase (AMP-forming), EC 6.1.1.10] reveal significant similarities beyond the anticipated correspondence of their respective dinucleotide-fold domains. One similarity comprises a 23-amino acid alpha-helix-turn-beta-strand motif found in each enzyme within a domain that is inserted between the two halves of the dinucleotide binding fold. A second correspondence, which consists of two alpha-helices connected by a large loop and beta-strand, is located in the Gln-tRNA synthetase within a region that binds the inside corner of the "L"-shaped tRNA molecule. This structural motif contains a long alpha-helix, which extends along the entire length of the D and anticodon stems of the complexed tRNA. We suggest that the positioning of this helix relative to the dinucleotide fold plays a critical role in ensuring the proper global orientation of tRNA(Gln) on the surface of the enzyme. The structural correspondences suggest a similar overall orientation of binding of tRNA(Met) and tRNA(Gln) to their respective synthetases.
MeSH Terms
Amino Acyl-tRNA Synthetases/chemistry,metabolism
Escherichia coli/enzymology
Methionine-tRNA Ligase/chemistry,metabolism
Models, Molecular
Nucleic Acid Conformation
Protein Conformation
RNA, Transfer, Gln/chemistry,metabolism
RNA, Transfer, Met/chemistry,metabolism
Chemicals
RNA, Transfer, Gln
RNA, Transfer, Met
Amino Acyl-tRNA Synthetases
Methionine-tRNA Ligase
glutaminyl-tRNA synthetase
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Perona J J
Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.
Rould M A
Steitz T A
Risler J L
Zelwer C
Brunie S
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