1obc

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[[Image:1obc.gif|left|200px]]
[[Image:1obc.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 1obc |SIZE=350|CAPTION= <scene name='initialview01'>1obc</scene>, resolution 2.10&Aring;
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The line below this paragraph, containing "STRUCTURE_1obc", creates the "Structure Box" on the page.
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|SITE= <scene name='pdbsite=AC1:Lms+Binding+Site+For+Chain+A'>AC1</scene>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=2AD:2&#39;-AMINO-2&#39;-DEOXYADENOSINE'>2AD</scene>, <scene name='pdbligand=LEU:LEUCINE'>LEU</scene>, <scene name='pdbligand=LMS:[(2R,3S,4R,5R)-5-(6-AMINO-9H-PURIN-9-YL)-3,4-DIHYDROXYTETRAHYDRO-2-FURANYL]METHYL+SULFAMATE'>LMS</scene>, <scene name='pdbligand=NVA:NORVALINE'>NVA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY=
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or leave the SCENE parameter empty for the default display.
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|GENE=
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|DOMAIN=
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{{STRUCTURE_1obc| PDB=1obc | SCENE= }}
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1obc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1obc OCA], [http://www.ebi.ac.uk/pdbsum/1obc PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1obc RCSB]</span>
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}}
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'''LEUCYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED WITH A POST-TRANSFER EDITING SUBSTRATE ANALOGUE'''
'''LEUCYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED WITH A POST-TRANSFER EDITING SUBSTRATE ANALOGUE'''
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[[Category: Tukalo, M.]]
[[Category: Tukalo, M.]]
[[Category: Yaremchuk, A.]]
[[Category: Yaremchuk, A.]]
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[[Category: aminoacyl-trna synthetase]]
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[[Category: Aminoacyl-trna synthetase]]
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[[Category: atp + l-leucine + trna (leu) -> amp + ppi l-leucyl-trna(leu)]]
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[[Category: Class i aminoacyl-trna synthetase]]
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[[Category: class i aminoacyl-trna synthetase]]
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[[Category: Synthetase]]
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[[Category: synthetase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:37:40 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:42:43 2008''
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Revision as of 00:37, 3 May 2008

Image:1obc.gif

Template:STRUCTURE 1obc

LEUCYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED WITH A POST-TRANSFER EDITING SUBSTRATE ANALOGUE


Overview

The aminoacyl-tRNA synthetases link tRNAs with their cognate amino acid. In some cases, their fidelity relies on hydrolytic editing that destroys incorrectly activated amino acids or mischarged tRNAs. We present structures of leucyl-tRNA synthetase complexed with analogs of the distinct pre- and posttransfer editing substrates. The editing active site binds the two different substrates using a single amino acid discriminatory pocket while preserving the same mode of adenine recognition. This suggests a similar mechanism of hydrolysis for both editing substrates that depends on a key, completely conserved aspartic acid, which interacts with the alpha-amino group of the noncognate amino acid and positions both substrates for hydrolysis. Our results demonstrate the economy by which a single active site accommodates two distinct substrates in a proofreading process critical to the fidelity of protein synthesis.

About this Structure

1OBC is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Structural and mechanistic basis of pre- and posttransfer editing by leucyl-tRNA synthetase., Lincecum TL Jr, Tukalo M, Yaremchuk A, Mursinna RS, Williams AM, Sproat BS, Van Den Eynde W, Link A, Van Calenbergh S, Grotli M, Martinis SA, Cusack S, Mol Cell. 2003 Apr;11(4):951-63. PMID:12718881 Page seeded by OCA on Sat May 3 03:37:40 2008

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OCA

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