6mtc

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Rabbit 80S ribosome with Z-site tRNA and IFRD2 (unrotated state)

Structural highlights

6mtc is a 10 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.4Å
Experimental data:Check to display Experimental Data
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

RL8_RABIT Component of the large ribosomal subunit (PubMed:25601755, PubMed:26245381, PubMed:27863242, PubMed:30517857). The ribosome is a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell (PubMed:25601755, PubMed:26245381, PubMed:27863242, PubMed:30517857).[1] [2] [3] [4]

Publication Abstract from PubMed

The cellular levels and activities of ribosomes directly regulate gene expression during numerous physiological processes. The mechanisms that globally repress translation are incompletely understood. Here, we use electron cryomicroscopy to analyze inactive ribosomes isolated from mammalian reticulocytes, the penultimate stage of red blood cell differentiation. We identify two types of ribosomes that are translationally repressed by protein interactions. The first comprises ribosomes sequestered with elongation factor 2 (eEF2) by SERPINE mRNA binding protein 1 (SERBP1) occupying the ribosomal mRNA entrance channel. The second type are translationally repressed by a novel ribosome-binding protein, interferon-related developmental regulator 2 (IFRD2), which spans the P and E sites and inserts a C-terminal helix into the mRNA exit channel to preclude translation. IFRD2 binds ribosomes with a tRNA occupying a noncanonical binding site, the 'Z site', on the ribosome. These structures provide functional insights into how ribosomal interactions may suppress translation to regulate gene expression.

Structures of translationally inactive mammalian ribosomes.,Brown A, Baird MR, Yip MC, Murray J, Shao S Elife. 2018 Oct 24;7. pii: 40486. doi: 10.7554/eLife.40486. PMID:30355441[5]

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

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See Also

References

  1. ↑ Muhs M, Hilal T, Mielke T, Skabkin MA, Sanbonmatsu KY, Pestova TV, Spahn CM. Cryo-EM of Ribosomal 80S Complexes with Termination Factors Reveals the Translocated Cricket Paralysis Virus IRES. Mol Cell. 2015 Feb 5;57(3):422-432. doi: 10.1016/j.molcel.2014.12.016. Epub 2015 , Jan 15. PMID:25601755 doi:http://dx.doi.org/10.1016/j.molcel.2014.12.016
  2. ↑ Brown A, Shao S, Murray J, Hegde RS, Ramakrishnan V. Structural basis for stop codon recognition in eukaryotes. Nature. 2015 Aug 27;524(7566):493-6. doi: 10.1038/nature14896. Epub 2015 Aug 5. PMID:26245381 doi:http://dx.doi.org/10.1038/nature14896
  3. ↑ Shao S, Murray J, Brown A, Taunton J, Ramakrishnan V, Hegde RS. Decoding Mammalian Ribosome-mRNA States by Translational GTPase Complexes. Cell. 2016 Nov 17;167(5):1229-1240.e15. doi: 10.1016/j.cell.2016.10.046. PMID:27863242 doi:http://dx.doi.org/10.1016/j.cell.2016.10.046
  4. ↑ Flis J, Holm M, Rundlet EJ, Loerke J, Hilal T, Dabrowski M, Burger J, Mielke T, Blanchard SC, Spahn CMT, Budkevich TV. tRNA Translocation by the Eukaryotic 80S Ribosome and the Impact of GTP Hydrolysis. Cell Rep. 2018 Dec 4;25(10):2676-2688.e7. doi: 10.1016/j.celrep.2018.11.040. PMID:30517857 doi:http://dx.doi.org/10.1016/j.celrep.2018.11.040
  5. ↑ Brown A, Baird MR, Yip MC, Murray J, Shao S. Structures of translationally inactive mammalian ribosomes. Elife. 2018 Oct 24;7. pii: 40486. doi: 10.7554/eLife.40486. PMID:30355441 doi:http://dx.doi.org/10.7554/eLife.40486

Contents


Parsing response... [2307847/3157645]

6mtc, resolution 3.40Å

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