2hl2: Difference between revisions
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|PDB= 2hl2 |SIZE=350|CAPTION= <scene name='initialview01'>2hl2</scene>, resolution 2.60Å | |PDB= 2hl2 |SIZE=350|CAPTION= <scene name='initialview01'>2hl2</scene>, resolution 2.60Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand=SSA:5 | |LIGAND= <scene name='pdbligand=SSA:5'-O-(N-(L-SERYL)-SULFAMOYL)ADENOSINE'>SSA</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/Threonine--tRNA_ligase Threonine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.3 6.1.1.3] | |ACTIVITY= [http://en.wikipedia.org/wiki/Threonine--tRNA_ligase Threonine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.3 6.1.1.3] | ||
|GENE= | |GENE= | ||
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[[Category: translation]] | [[Category: translation]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 23 15:15:59 2008'' | ||
Revision as of 13:16, 23 March 2008
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| 2hl2, resolution 2.60Å | |||||||||||||
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| Ligands: | SSA | ||||||||||||
| Activity: | Threonine--tRNA ligase, with EC number 6.1.1.3 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
Crystal structure of the editing domain of threonyl-tRNA synthetase from Pyrococcus abyssi in complex with an analog of seryladenylate
Overview
To ensure a high fidelity during translation, threonyl-tRNA synthetases (ThrRSs) harbor an editing domain that removes noncognate L-serine attached to tRNAThr. Most archaeal ThrRSs possess a unique editing domain structurally similar to D-aminoacyl-tRNA deacylases (DTDs) found in eubacteria and eukaryotes that specifically removes D-amino acids attached to tRNA. Here, we provide mechanistic insights into the removal of noncognate L-serine from tRNAThr by a DTD-like editing module from Pyrococcus abyssi ThrRS (Pab-NTD). High-resolution crystal structures of Pab-NTD with pre- and post-transfer substrate analogs and with L-serine show mutually nonoverlapping binding sites for the seryl moiety. Although the pre-transfer editing is excluded, the analysis reveals the importance of main chain atoms in proper positioning of the post-transfer substrate for its hydrolysis. A single residue has been shown to play a pivotal role in the inversion of enantioselectivity both in Pab-NTD and DTD. The study identifies an enantioselectivity checkpoint that filters opposite chiral molecules and thus provides a fascinating example of how nature has subtly engineered this domain for the selection of chiral molecules during translation.
About this Structure
2HL2 is a Single protein structure of sequence from Pyrococcus abyssi. Full crystallographic information is available from OCA.
Reference
Post-transfer editing mechanism of a D-aminoacyl-tRNA deacylase-like domain in threonyl-tRNA synthetase from archaea., Hussain T, Kruparani SP, Pal B, Dock-Bregeon AC, Dwivedi S, Shekar MR, Sureshbabu K, Sankaranarayanan R, EMBO J. 2006 Sep 6;25(17):4152-62. Epub 2006 Aug 10. PMID:16902403
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