3afh

From Proteopedia

Crystal structure of Thermotoga maritima nondiscriminating glutamyl-tRNA synthetase in complex with a glutamyl-AMP analog

Structural highlights

3afh is a 1 chain structure with sequence from Thermotoga maritima. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SYE2_THEMA Catalyzes the attachment of glutamate to tRNA(Glu) in a two-step reaction: glutamate is first activated by ATP to form Glu-AMP and then transferred to the acceptor end of tRNA(Glu).[HAMAP-Rule:MF_00022]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Aminoacyl-tRNA synthetases produce aminoacyl-tRNAs from the substrate tRNA and its cognate amino acid with the aid of ATP. Two types of glutamyl-tRNA synthetase (GluRS) have been discovered: discriminating GluRS (D-GluRS) and nondiscriminating GluRS (ND-GluRS). D-GluRS glutamylates tRNA(Glu) only, while ND-GluRS glutamylates both tRNA(Glu) and tRNA(Gln). ND-GluRS produces the intermediate Glu-tRNA(Gln), which is converted to Gln-tRNA(Gln) by Glu-tRNA(Gln) amidotransferase. Two GluRS homologues from Thermotoga maritima, TM1875 and TM1351, have been biochemically characterized and it has been clarified that only TM1875 functions as an ND-GluRS. Furthermore, the crystal structure of the T. maritima ND-GluRS, TM1875, was determined in complex with a Glu-AMP analogue at 2.0 A resolution. The T. maritima ND-GluRS contains a characteristic structure in the connective-peptide domain, which is inserted into the catalytic Rossmann-fold domain. The glutamylation ability of tRNA(Gln) by ND-GluRS was measured in the presence of the bacterial Glu-tRNA(Gln) amidotransferase GatCAB. Interestingly, the glutamylation efficiency was not affected even in the presence of excess GatCAB. Therefore, GluRS avoids competition with GatCAB and glutamylates tRNA(Gln).

Structure of nondiscriminating glutamyl-tRNA synthetase from Thermotoga maritima.,Ito T, Kiyasu N, Matsunaga R, Takahashi S, Yokoyama S Acta Crystallogr D Biol Crystallogr. 2010 Jul;66(Pt 7):813-20. Epub 2010, Jun 19. PMID:20606262^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Ito T, Kiyasu N, Matsunaga R, Takahashi S, Yokoyama S. Structure of nondiscriminating glutamyl-tRNA synthetase from Thermotoga maritima. Acta Crystallogr D Biol Crystallogr. 2010 Jul;66(Pt 7):813-20. Epub 2010, Jun 19. PMID:20606262 doi:10.1107/S0907444910019086