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.
1vqn
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:1vqn.gif|left|200px]] | [[Image:1vqn.gif|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_1vqn", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | | | + | or leave the SCENE parameter empty for the default display. |
| - | | | + | --> |
| - | + | {{STRUCTURE_1vqn| PDB=1vqn | SCENE= }} | |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''The structure of CC-HPMN AND CCA-PHE-CAP-BIO bound to the large ribosomal subunit of haloarcula marismortui''' | '''The structure of CC-HPMN AND CCA-PHE-CAP-BIO bound to the large ribosomal subunit of haloarcula marismortui''' | ||
| Line 27: | Line 24: | ||
[[Category: Schmeing, T M.]] | [[Category: Schmeing, T M.]] | ||
[[Category: Steitz, T A.]] | [[Category: Steitz, T A.]] | ||
| - | [[Category: | + | [[Category: Peptidyl transferase reaction]] |
| - | [[Category: | + | [[Category: Protein-protein complex]] |
| - | [[Category: | + | [[Category: Protein-rna complex]] |
| - | [[Category: | + | [[Category: Ribosome 50]] |
| - | [[Category: | + | [[Category: Rna-rna complex]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 12:48:14 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 09:48, 3 May 2008
The structure of CC-HPMN AND CCA-PHE-CAP-BIO bound to the large ribosomal subunit of haloarcula marismortui
Overview
The large ribosomal subunit catalyses the reaction between the alpha-amino group of the aminoacyl-tRNA bound to the A site and the ester carbon of the peptidyl-tRNA bound to the P site, while preventing the nucleophilic attack of water on the ester, which would lead to unprogrammed deacylation of the peptidyl-tRNA. Here we describe three new structures of the large ribosomal subunit of Haloarcula marismortui (Hma) complexed with peptidyl transferase substrate analogues that reveal an induced-fit mechanism in which substrates and active-site residues reposition to allow the peptidyl transferase reaction. Proper binding of an aminoacyl-tRNA analogue to the A site induces specific movements of 23S rRNA nucleotides 2618-2620 (Escherichia coli numbering 2583-2585) and 2541(2506), thereby reorienting the ester group of the peptidyl-tRNA and making it accessible for attack. In the absence of the appropriate A-site substrate, the peptidyl transferase centre positions the ester link of the peptidyl-tRNA in a conformation that precludes the catalysed nucleophilic attack by water. Protein release factors may also function, in part, by inducing an active-site rearrangement similar to that produced by the A-site aminoacyl-tRNA, allowing the carbonyl group and water to be positioned for hydrolysis.
About this Structure
1VQN is a Protein complex structure of sequences from Haloarcula marismortui. Full crystallographic information is available from OCA.
Reference
An induced-fit mechanism to promote peptide bond formation and exclude hydrolysis of peptidyl-tRNA., Schmeing TM, Huang KS, Strobel SA, Steitz TA, Nature. 2005 Nov 24;438(7067):520-4. PMID:16306996 Page seeded by OCA on Sat May 3 12:48:14 2008
