This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

1ond

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 12:02, 11 September 2015

THE CRYSTAL STRUCTURE OF THE 50S LARGE RIBOSOMAL SUBUNIT FROM DEINOCOCCUS RADIODURANS COMPLEXED WITH TROLEANDOMYCIN MACROLIDE ANTIBIOTIC

Structural highlights

1ond is a 2 chain structure with sequence from Deinococcus radiodurans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1nkw, 1njm, 1jzy, 1jzz, 1njn, 1jzx
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[RL32_DEIRA] Forms a cluster with L17 and L22, and with L22, a pair of "tweezers" that hold together all the domains of the 23S rRNA. Interacts with the antibiotic troleandomycin which blocks the peptide exit tunnel.[HAMAP-Rule:MF_00340] [RL22_DEIRA] This protein binds specifically to 23S rRNA; its binding is stimulated by other ribosomal proteins, e.g. L4, L17, and L20. It is important during the early stages of 50S assembly. It makes multiple contacts with different domains of the 23S rRNA in the assembled 50S subunit and ribosome (By similarity).[HAMAP-Rule:MF_01331_B] The globular domain of the protein is located by the polypeptide exit tunnel on the outside of the subunit while an extended beta-hairpin forms part of the wall of the tunnel. Forms a pair of "tweezers" with L32 that hold together two different domains of the 23S rRNA. Interacts with the tunnel-blocking modified macrolide azithromycin. Upon binding of the macrolide troleadomycin to the ribosome, the tip of the beta-hairpin is displaced, which severely restricts the tunnel. This and experiments in E.coli have led to the suggestion that it is part of the gating mechanism involved in translation arrest in the absence of the protein export system.[HAMAP-Rule:MF_01331_B]

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

Nascent proteins emerge out of ribosomes through an exit tunnel, which was assumed to be a firmly built passive path. Recent biochemical results, however, indicate that the tunnel plays an active role in sequence-specific gating of nascent chains and in responding to cellular signals. Consistently, modulation of the tunnel shape, caused by the binding of the semi-synthetic macrolide troleandomycin to the large ribosomal subunit from Deinococcus radiodurans, was revealed crystallographically. The results provide insights into the tunnel dynamics at high resolution. Here we show that, in addition to the typical steric blockage of the ribosomal tunnel by macrolides, troleandomycin induces a conformational rearrangement in a wall constituent, protein L22, flipping the tip of its highly conserved beta-hairpin across the tunnel. On the basis of mutations that alleviate elongation arrest, the tunnel motion could be correlated with sequence discrimination and gating, suggesting that specific arrest motifs within nascent chain sequences may induce a similar gating mechanism.

Structural insight into the role of the ribosomal tunnel in cellular regulation.,Berisio R, Schluenzen F, Harms J, Bashan A, Auerbach T, Baram D, Yonath A Nat Struct Biol. 2003 May;10(5):366-70. PMID:12665853^[1]

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

References

↑ Berisio R, Schluenzen F, Harms J, Bashan A, Auerbach T, Baram D, Yonath A. Structural insight into the role of the ribosomal tunnel in cellular regulation. Nat Struct Biol. 2003 May;10(5):366-70. PMID:12665853 doi:10.1038/nsb915

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1ond"

@@ Line 5: / Line 5: @@
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=TAO:TROLEANDOMYCIN'>TAO</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1nkw|1nkw]], [[1njm|1njm]], [[1jzy|1jzy]], [[1jzz|1jzz]], [[1njn|1njn]], [[1jzx|1jzx]]</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ond FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ond OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1ond RCSB], [http://www.ebi.ac.uk/pdbsum/1ond PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ond FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ond OCA], [http://pdbe.org/1ond PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ond RCSB], [http://www.ebi.ac.uk/pdbsum/1ond PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 27: / Line 27: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1ond" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Ribosomal protein L22|Ribosomal protein L22]]
+*[[Ribosomal protein L32|Ribosomal protein L32]]
 == References ==
 <references/>

1ond

From Proteopedia

Revision as of 12:02, 11 September 2015

THE CRYSTAL STRUCTURE OF THE 50S LARGE RIBOSOMAL SUBUNIT FROM DEINOCOCCUS RADIODURANS COMPLEXED WITH TROLEANDOMYCIN MACROLIDE ANTIBIOTIC

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox