1ffz: Difference between revisions
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==LARGE RIBOSOMAL SUBUNIT COMPLEXED WITH R(CC)-DA-PUROMYCIN== | |||
<StructureSection load='1ffz' size='340' side='right' caption='[[1ffz]], [[Resolution|resolution]] 3.20Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1ffz]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Haloarcula_marismortui Haloarcula marismortui]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FFZ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1FFZ FirstGlance]. <br> | |||
</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=PU:PUROMYCIN-N-AMINOPHOSPHONIC+ACID'>PU</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1ffk|1ffk]], [[1fg0|1fg0]]</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=1ffz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ffz OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1ffz RCSB], [http://www.ebi.ac.uk/pdbsum/1ffz PDBsum]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Using the atomic structures of the large ribosomal subunit from Haloarcula marismortui and its complexes with two substrate analogs, we establish that the ribosome is a ribozyme and address the catalytic properties of its all-RNA active site. Both substrate analogs are contacted exclusively by conserved ribosomal RNA (rRNA) residues from domain V of 23S rRNA; there are no protein side-chain atoms closer than about 18 angstroms to the peptide bond being synthesized. The mechanism of peptide bond synthesis appears to resemble the reverse of the acylation step in serine proteases, with the base of A2486 (A2451 in Escherichia coli) playing the same general base role as histidine-57 in chymotrypsin. The unusual pK(a) (where K(a) is the acid dissociation constant) required for A2486 to perform this function may derive in part from its hydrogen bonding to G2482 (G2447 in E. coli), which also interacts with a buried phosphate that could stabilize unusual tautomers of these two bases. The polypeptide exit tunnel is largely formed by RNA but has significant contributions from proteins L4, L22, and L39e, and its exit is encircled by proteins L19, L22, L23, L24, L29, and L31e. | |||
The structural basis of ribosome activity in peptide bond synthesis.,Nissen P, Hansen J, Ban N, Moore PB, Steitz TA Science. 2000 Aug 11;289(5481):920-30. PMID:10937990<ref>PMID:10937990</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
==See Also== | ==See Also== | ||
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*[[Ribosome|Ribosome]] | *[[Ribosome|Ribosome]] | ||
*[[User:Wayne Decatur/Haloarcula Large Ribosomal Subunit|User:Wayne Decatur/Haloarcula Large Ribosomal Subunit]] | *[[User:Wayne Decatur/Haloarcula Large Ribosomal Subunit|User:Wayne Decatur/Haloarcula Large Ribosomal Subunit]] | ||
== References == | |||
== | <references/> | ||
< | __TOC__ | ||
</StructureSection> | |||
[[Category: Haloarcula marismortui]] | [[Category: Haloarcula marismortui]] | ||
[[Category: Ban, N | [[Category: Ban, N]] | ||
[[Category: Hansen, J | [[Category: Hansen, J]] | ||
[[Category: Moore, P B | [[Category: Moore, P B]] | ||
[[Category: Nissen, P | [[Category: Nissen, P]] | ||
[[Category: Steitz, T A | [[Category: Steitz, T A]] | ||
[[Category: Ribosomal rna]] | [[Category: Ribosomal rna]] | ||
[[Category: Ribosome]] | [[Category: Ribosome]] | ||
Revision as of 16:57, 17 December 2014
LARGE RIBOSOMAL SUBUNIT COMPLEXED WITH R(CC)-DA-PUROMYCINLARGE RIBOSOMAL SUBUNIT COMPLEXED WITH R(CC)-DA-PUROMYCIN
Structural highlights
Publication Abstract from PubMedUsing the atomic structures of the large ribosomal subunit from Haloarcula marismortui and its complexes with two substrate analogs, we establish that the ribosome is a ribozyme and address the catalytic properties of its all-RNA active site. Both substrate analogs are contacted exclusively by conserved ribosomal RNA (rRNA) residues from domain V of 23S rRNA; there are no protein side-chain atoms closer than about 18 angstroms to the peptide bond being synthesized. The mechanism of peptide bond synthesis appears to resemble the reverse of the acylation step in serine proteases, with the base of A2486 (A2451 in Escherichia coli) playing the same general base role as histidine-57 in chymotrypsin. The unusual pK(a) (where K(a) is the acid dissociation constant) required for A2486 to perform this function may derive in part from its hydrogen bonding to G2482 (G2447 in E. coli), which also interacts with a buried phosphate that could stabilize unusual tautomers of these two bases. The polypeptide exit tunnel is largely formed by RNA but has significant contributions from proteins L4, L22, and L39e, and its exit is encircled by proteins L19, L22, L23, L24, L29, and L31e. The structural basis of ribosome activity in peptide bond synthesis.,Nissen P, Hansen J, Ban N, Moore PB, Steitz TA Science. 2000 Aug 11;289(5481):920-30. PMID:10937990[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also
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