|
|
| (One intermediate revision not shown.) |
| Line 1: |
Line 1: |
| - | {{Large structure}}
| + | |
| | ==Crystal structure of the asparagine transamidosome from Pseudomonas aeruginosa== | | ==Crystal structure of the asparagine transamidosome from Pseudomonas aeruginosa== |
| - | <StructureSection load='4wj3' size='340' side='right' caption='[[4wj3]], [[Resolution|resolution]] 3.71Å' scene=''> | + | <StructureSection load='4wj3' size='340' side='right'caption='[[4wj3]], [[Resolution|resolution]] 3.71Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4wj3]] is a 20 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4WJ3 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4WJ3 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4wj3]] is a 20 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_aeruginosa_PAO1 Pseudomonas aeruginosa PAO1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4WJ3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4WJ3 FirstGlance]. <br> |
| - | </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=UNK:UNKNOWN'>UNK</scene></td></tr> | + | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4wj3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wj3 OCA], [https://pdbe.org/4wj3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4wj3 RCSB], [https://www.ebi.ac.uk/pdbsum/4wj3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4wj3 ProSAT]</span></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4wj4|4wj4]]</td></tr>
| + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Glutaminyl-tRNA_synthase_(glutamine-hydrolyzing) Glutaminyl-tRNA synthase (glutamine-hydrolyzing)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.5.7 6.3.5.7] </span></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=4wj3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wj3 OCA], [http://pdbe.org/4wj3 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4wj3 RCSB], [http://www.ebi.ac.uk/pdbsum/4wj3 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4wj3 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| - | {{Large structure}} | |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SYDND_PSEAE SYDND_PSEAE]] Aspartyl-tRNA synthetase with relaxed tRNA specificity since it is able to aspartylate not only its cognate tRNA(Asp) but also tRNA(Asn). Is 1.5 times more efficient at aminoacylating E.coli tRNA(Asp) over tRNA(Asn). Reaction proceeds in two steps: aspartate is first activated by ATP to form Asp-AMP and then transferred to the acceptor end of tRNA(Asp/Asn).<ref>PMID:16352843</ref> [[http://www.uniprot.org/uniprot/GATA_PSEAE GATA_PSEAE]] Allows the formation of correctly charged Gln-tRNA(Gln) through the transamidation of misacylated Glu-tRNA(Gln) in organisms which lack glutaminyl-tRNA synthetase. The reaction takes place in the presence of glutamine and ATP through an activated gamma-phospho-Glu-tRNA(Gln). [[http://www.uniprot.org/uniprot/GATC_PSEAE GATC_PSEAE]] Allows the formation of correctly charged Asn-tRNA(Asn) or Gln-tRNA(Gln) through the transamidation of misacylated Asp-tRNA(Asn) or Glu-tRNA(Gln) in organisms which lack either or both of asparaginyl-tRNA or glutaminyl-tRNA synthetases. The reaction takes place in the presence of glutamine and ATP through an activated phospho-Asp-tRNA(Asn) or phospho-Glu-tRNA(Gln). [[http://www.uniprot.org/uniprot/GATB_PSEAE GATB_PSEAE]] Allows the formation of correctly charged Asn-tRNA(Asn) or Gln-tRNA(Gln) through the transamidation of misacylated Asp-tRNA(Asn) or Glu-tRNA(Gln) in organisms which lack either or both of asparaginyl-tRNA or glutaminyl-tRNA synthetases. The reaction takes place in the presence of glutamine and ATP through an activated phospho-Asp-tRNA(Asn) or phospho-Glu-tRNA(Gln). | + | [https://www.uniprot.org/uniprot/GATB_PSEAE GATB_PSEAE] Allows the formation of correctly charged Asn-tRNA(Asn) or Gln-tRNA(Gln) through the transamidation of misacylated Asp-tRNA(Asn) or Glu-tRNA(Gln) in organisms which lack either or both of asparaginyl-tRNA or glutaminyl-tRNA synthetases. The reaction takes place in the presence of glutamine and ATP through an activated phospho-Asp-tRNA(Asn) or phospho-Glu-tRNA(Gln). |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
| Line 23: |
Line 19: |
| | | | |
| | ==See Also== | | ==See Also== |
| - | *[[TRNA|TRNA]] | + | *[[Aminoacyl tRNA synthetase 3D structures|Aminoacyl tRNA synthetase 3D structures]] |
| | + | *[[Glutamyl-tRNA(Gln) amidotransferase|Glutamyl-tRNA(Gln) amidotransferase]] |
| | + | *[[Transfer RNA (tRNA)|Transfer RNA (tRNA)]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Kato, K]] | + | [[Category: Large Structures]] |
| - | [[Category: Nakamura, A]] | + | [[Category: Pseudomonas aeruginosa PAO1]] |
| - | [[Category: Suzuki, T]] | + | [[Category: Kato K]] |
| - | [[Category: Tanaka, I]] | + | [[Category: Nakamura A]] |
| - | [[Category: Yao, M]] | + | [[Category: Suzuki T]] |
| - | [[Category: Aminoacyl-trna synthetase]] | + | [[Category: Tanaka I]] |
| - | [[Category: Gatcab]] | + | [[Category: Yao M]] |
| - | [[Category: Ligase-rna complex]]
| + | |
| - | [[Category: Transamidosome]]
| + | |
| - | [[Category: Trna]]
| + | |
| Structural highlights
Function
GATB_PSEAE Allows the formation of correctly charged Asn-tRNA(Asn) or Gln-tRNA(Gln) through the transamidation of misacylated Asp-tRNA(Asn) or Glu-tRNA(Gln) in organisms which lack either or both of asparaginyl-tRNA or glutaminyl-tRNA synthetases. The reaction takes place in the presence of glutamine and ATP through an activated phospho-Asp-tRNA(Asn) or phospho-Glu-tRNA(Gln).
Publication Abstract from PubMed
Many prokaryotes lack a tRNA synthetase to attach asparagine to its cognate tRNAAsn, and instead synthesize asparagine from tRNAAsn-bound aspartate. This conversion involves two enzymes: a nondiscriminating aspartyl-tRNA synthetase (ND-AspRS) that forms Asp-tRNAAsn, and a heterotrimeric amidotransferase GatCAB that amidates Asp-tRNAAsn to form Asn-tRNAAsn for use in protein synthesis. ND-AspRS, GatCAB, and tRNAAsn may assemble in an approximately 400-kDa complex, known as the Asn-transamidosome, which couples the two steps of asparagine biosynthesis in space and time to yield Asn-tRNAAsn. We report the 3.7-A resolution crystal structure of the Pseudomonas aeruginosa Asn-transamidosome, which represents the most common machinery for asparagine biosynthesis in bacteria. We show that, in contrast to a previously described archaeal-type transamidosome, a bacteria-specific GAD domain of ND-AspRS provokes a principally new architecture of the complex. Both tRNAAsn molecules in the transamidosome simultaneously serve as substrates and scaffolds for the complex assembly. This architecture rationalizes an elevated dynamic and a greater turnover of ND-AspRS within bacterial-type transamidosomes, and possibly may explain a different evolutionary pathway of GatCAB in organisms with bacterial-type vs. archaeal-type Asn-transamidosomes. Importantly, because the two-step pathway for Asn-tRNAAsn formation evolutionarily preceded the direct attachment of Asn to tRNAAsn, our structure also may reflect the mechanism by which asparagine was initially added to the genetic code.
Structure of the Pseudomonas aeruginosa transamidosome reveals unique aspects of bacterial tRNA-dependent asparagine biosynthesis.,Suzuki T, Nakamura A, Kato K, Soll D, Tanaka I, Sheppard K, Yao M Proc Natl Acad Sci U S A. 2014 Dec 29. pii: 201423314. PMID:25548166[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Suzuki T, Nakamura A, Kato K, Soll D, Tanaka I, Sheppard K, Yao M. Structure of the Pseudomonas aeruginosa transamidosome reveals unique aspects of bacterial tRNA-dependent asparagine biosynthesis. Proc Natl Acad Sci U S A. 2014 Dec 29. pii: 201423314. PMID:25548166 doi:http://dx.doi.org/10.1073/pnas.1423314112
|
