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1it7
From Proteopedia
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|PDB= 1it7 |SIZE=350|CAPTION= <scene name='initialview01'>1it7</scene>, resolution 2.30Å | |PDB= 1it7 |SIZE=350|CAPTION= <scene name='initialview01'>1it7</scene>, resolution 2.30Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand= | + | |LIGAND= <scene name='pdbligand=GUN:GUANINE'>GUN</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> |
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Queuine_tRNA-ribosyltransferase Queuine tRNA-ribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.29 2.4.2.29] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Queuine_tRNA-ribosyltransferase Queuine tRNA-ribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.29 2.4.2.29] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1iq8|1IQ8]], [[1it8|1IT8]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1it7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1it7 OCA], [http://www.ebi.ac.uk/pdbsum/1it7 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1it7 RCSB]</span> | ||
}} | }} | ||
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[[Category: Watanabe, M.]] | [[Category: Watanabe, M.]] | ||
[[Category: Yokoyama, S.]] | [[Category: Yokoyama, S.]] | ||
| - | [[Category: GUN]] | ||
| - | [[Category: MG]] | ||
| - | [[Category: ZN]] | ||
[[Category: (alpha/beta)8 barrel]] | [[Category: (alpha/beta)8 barrel]] | ||
[[Category: riken structural genomics/proteomics initiative]] | [[Category: riken structural genomics/proteomics initiative]] | ||
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[[Category: structural genomic]] | [[Category: structural genomic]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:24:22 2008'' |
Revision as of 18:24, 30 March 2008
| |||||||
| , resolution 2.30Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , | ||||||
| Activity: | Queuine tRNA-ribosyltransferase, with EC number 2.4.2.29 | ||||||
| Related: | 1IQ8, 1IT8
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of archaeosine tRNA-guanine transglycosylase complexed with guanine
Overview
Archaeosine tRNA-guanine transglycosylase (ArcTGT) catalyzes the exchange of guanine at position 15 in the D-loop of archaeal tRNAs with a free 7-cyano-7-deazaguanine (preQ(0)) base, as the first step in the biosynthesis of an archaea-specific modified base, archaeosine (7-formamidino-7-deazaguanosine). We determined the crystal structures of ArcTGT from Pyrococcus horikoshii at 2.2 A resolution and its complexes with guanine and preQ(0), at 2.3 and 2.5 A resolutions, respectively. The N-terminal catalytic domain folds into an (alpha/beta)(8) barrel with a characteristic zinc-binding site, showing structural similarity with that of the bacterial queuosine TGT (QueTGT), which is involved in queuosine (7-[[(4,5-cis-dihydroxy-2-cyclopenten-1-yl)-amino]methyl]-7-deazaguanosine ) biosynthesis and targets the tRNA anticodon. ArcTGT forms a dimer, involving the zinc-binding site and the ArcTGT-specific C-terminal domain. The C-terminal domains have novel folds, including an OB fold-like "PUA domain", whose sequence is widely conserved in eukaryotic and archaeal RNA modification enzymes. Therefore, the C-terminal domains may be involved in tRNA recognition. In the free-form structure of ArcTGT, an alpha-helix located at the rim of the (alpha/beta)(8) barrel structure is completely disordered, while it is ordered in the guanine-bound and preQ(0)-bound forms. Structural comparison of the ArcTGT.preQ(0), ArcTGT.guanine, and QueTGT.preQ(1) complexes provides novel insights into the substrate recognition mechanisms of ArcTGT.
About this Structure
1IT7 is a Single protein structure of sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA.
Reference
Crystal structure of archaeosine tRNA-guanine transglycosylase., Ishitani R, Nureki O, Fukai S, Kijimoto T, Nameki N, Watanabe M, Kondo H, Sekine M, Okada N, Nishimura S, Yokoyama S, J Mol Biol. 2002 May 3;318(3):665-77. PMID:12054814
Page seeded by OCA on Sun Mar 30 21:24:22 2008
Categories: Pyrococcus horikoshii | Queuine tRNA-ribosyltransferase | Single protein | Fukai, S. | Ishitani, R. | Kijimoto, T. | Kondo, H. | Nameki, N. | Nishimura, S. | Nureki, O. | Okada, N. | RSGI, RIKEN Structural Genomics/Proteomics Initiative. | Sekine, M. | Watanabe, M. | Yokoyama, S. | (alpha/beta)8 barrel | Riken structural genomics/proteomics initiative | Rsgi | Structural genomic
