2J5B

Structure of the Tyrosyl tRNA synthetase from Acanthamoeba polyphaga Mimivirus complexed with tyrosynol

Summary for 2J5B

• Entry DOI: 10.2210/pdb2j5b/pdb
• Descriptor: TYROSYL-TRNA SYNTHETASE, 4-[(2S)-2-amino-3-hydroxypropyl]phenol (3 entities in total)
• Functional Keywords: ligase, protein biosynthesis, atp-binding
• Biological source: ACANTHAMOEBA POLYPHAGA MIMIVIRUS
• Total number of polymer chains: 2
• Total formula weight: 80125.82

Authors

Abergel, C.,Rudinger-thirion, J.,Giege, R.,Claverie, J.M. (deposition date: 2006-09-13, release date: 2007-09-25, Last modification date: 2024-05-01)

Primary citation

Abergel, C.,Rudinger-Thirion, J.,Giege, R.,Claverie, J.M.
Virus-Encoded Aminoacyl-tRNA Synthetases: Structural and Functional Characterization of Mimivirus Tyrrs and Metrs.
J.Virol., 81:12406-, 2007

PubMed Abstract: Aminoacyl-tRNA synthetases are pivotal in determining how the genetic code is translated in amino acids and in providing the substrate for protein synthesis. As such, they fulfill a key role in a process universally conserved in all cellular organisms from their most complex to their most reduced parasitic forms. In contrast, even complex viruses were not found to encode much translation machinery, with the exception of isolated components such as tRNAs. In this context, the discovery of four aminoacyl-tRNA synthetases encoded in the genome of mimivirus together with a full set of translation initiation, elongation, and termination factors appeared to blur what was once a clear frontier between the cellular and viral world. Functional studies of two mimivirus tRNA synthetases confirmed the MetRS specificity for methionine and the TyrRS specificity for tyrosine and conformity with the identity rules for tRNA(Tyr) for archea/eukarya. The atomic structure of the mimivirus tyrosyl-tRNA synthetase in complex with tyrosinol exhibits the typical fold and active-site organization of archaeal-type TyrRS. However, the viral enzyme presents a unique dimeric conformation and significant differences in its anticodon binding site. The present work suggests that mimivirus aminoacyl-tRNA synthetases function as regular translation enzymes in infected amoebas. Their phylogenetic classification does not suggest that they have been acquired recently by horizontal gene transfer from a cellular host but rather militates in favor of an intricate evolutionary relationship between large DNA viruses and ancestral eukaryotes.

PubMed: 17855524
DOI: 10.1128/JVI.01107-07

Experimental method

X-RAY DIFFRACTION (2.2 Å)