Conformation of methylated GGQ in the Peptidyl Transferase Center during Translation Termination
Journal Article
·
· Scientific Reports
- Univ. of Illinois at Urbana-Champaign, IL (United States)
The universally conserved Gly-Gly-Gln (GGQ) tripeptide in release factors or release factor-like surveillance proteins is required to catalyze the release of nascent peptide in the ribosome. The glutamine of the GGQ is methylated post-translationally at the N5 position in vivo; this covalent modification is essential for optimal cell growth and efficient translation termination. However, the precise conformation of the methylated-GGQ tripeptide in the ribosome remains unknown. Using cryoEM and X-ray crystallography, we report the conformation of methylated-GGQ in the peptidyl transferase center of the ribosome during canonical translational termination and co-translation quality control. It has been suggested that the GGQ motif arose independently through convergent evolution among otherwise unrelated proteins that catalyze peptide release. The requirement for this tripeptide in the highly conserved peptidyl transferase center suggests that the conformation reported here is likely shared during termination of protein synthesis in all domains of life
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH)
- OSTI ID:
- 1432880
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
The structural basis for release-factor activation during translation termination revealed by time-resolved cryogenic electron microscopy
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journal | June 2019 |
Extensive ribosome and RF2 rearrangements during translation termination
|
journal | September 2019 |
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