Cryo-EM reveals an active role for aminoacyl-tRNA in the accommodation process.Valle, M., Sengupta, J., Swami, N.K., Grassucci, R.A., Burkhardt, N., Nierhaus, K.H., Agrawal, R.K., Frank, J.
(2002) EMBO J. 21: 3557-3567
- PubMed: 12093756
- DOI: 10.1093/emboj/cdf326
- Primary Citation of Related Structures:
- PubMed Abstract:
- Helix unwinding in the effector region of elongation factor EF-Tu-GDP
Polekhina, G.,Thirup, S.,Kjeldgaard, M.,Nissen, P.,Lippmann, C.,Nyborg, J.
(1996) Structure 4: 1141
- Crystal structure of intact elongation factor EF-Tu from E.coli in GDP conformation at 2.05A resolution
Song, H.,Parsons, M.R.,Rowsell, S.,Leonard, G.,Phillips, S.E.
(1999) J.Mol.Biol. 285: 1245
- Visualization of elongation factor Tu on Escherichia coli ribosome
Stark, H.,Rodnina, M.V.,Rinke-Appel, J.,Brimacombe, R.,Wintermeyer, W.,van Heel, M.
(1997) Nature 389: 403
- Crystal structure of the ternary complex of the Phe-tRNAPhe, EF-Tu, and a GTP analog
Nissen, P.,Kjeldgaard, M.,Thirup, S.,Polekhina, G.,Reshetnikova, L.,Clark, B.F.C.,Nyborg, J.
(1995) Science 270: 1464
- The crystal structure of elongation factor EF-Tu from Thermus aquaticus in the GTP conformation
Kjeldgaard, M.,Nissen, P.,Thirup, S.,Nyborg, J.
(1993) Structure 1: 35
During the elongation cycle of protein biosynthesis, the specific amino acid coded for by the mRNA is delivered by a complex that is comprised of the cognate aminoacyl-tRNA, elongation factor Tu and GTP. As this ternary complex binds to the ribosome, ...
During the elongation cycle of protein biosynthesis, the specific amino acid coded for by the mRNA is delivered by a complex that is comprised of the cognate aminoacyl-tRNA, elongation factor Tu and GTP. As this ternary complex binds to the ribosome, the anticodon end of the tRNA reaches the decoding center in the 30S subunit. Here we present the cryo- electron microscopy (EM) study of an Escherichia coli 70S ribosome-bound ternary complex stalled with an antibiotic, kirromycin. In the cryo-EM map the anticodon arm of the tRNA presents a new conformation that appears to facilitate the initial codon-anticodon interaction. Furthermore, the elbow region of the tRNA is seen to contact the GTPase-associated center on the 50S subunit of the ribosome, suggesting an active role of the tRNA in the transmission of the signal prompting the GTP hydrolysis upon codon recognition.
Howard Hughes Medical Institute, Health Research, Inc., Empire State Plaza, Albany, NY 12201-0509, USA.