4ojm
From Proteopedia
(Difference between revisions)
| Line 1: | Line 1: | ||
| - | + | ==Crystal structure of a C-terminally truncated CYT-18 protein including N-terminal residues== | |
| - | + | <StructureSection load='4ojm' size='340' side='right' caption='[[4ojm]], [[Resolution|resolution]] 1.95Å' scene=''> | |
| - | + | == Structural highlights == | |
| - | + | <table><tr><td colspan='2'>[[4ojm]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Neucr Neucr]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4OJM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4OJM FirstGlance]. <br> | |
| - | ==Function== | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=TYR:TYROSINE'>TYR</scene></td></tr> |
| + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1y42|1y42]]</td></tr> | ||
| + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">cyt-18, B18P24.070, NCU03030 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=367110 NEUCR])</td></tr> | ||
| + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Tyrosine--tRNA_ligase Tyrosine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.1 6.1.1.1] </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=4ojm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ojm OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4ojm RCSB], [http://www.ebi.ac.uk/pdbsum/4ojm PDBsum]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
[[http://www.uniprot.org/uniprot/SYYM_NEUCR SYYM_NEUCR]] Catalyzes the attachment of tyrosine to tRNA(Tyr) in a two-step reaction: tyrosine is first activated by ATP to form Tyr-AMP and then transferred to the acceptor end of tRNA(Tyr). Has both an aminoacyl-tRNA synthetase activity and is involved in the splicing of group I introns. It acts in intron splicing by stabilizing the catalytically active structure of the intron. | [[http://www.uniprot.org/uniprot/SYYM_NEUCR SYYM_NEUCR]] Catalyzes the attachment of tyrosine to tRNA(Tyr) in a two-step reaction: tyrosine is first activated by ATP to form Tyr-AMP and then transferred to the acceptor end of tRNA(Tyr). Has both an aminoacyl-tRNA synthetase activity and is involved in the splicing of group I introns. It acts in intron splicing by stabilizing the catalytically active structure of the intron. | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | The mitochondrial tyrosyl tRNA synthetase from Neurospora crassa (CYT-18 protein) is a bifunctional group I intron splicing cofactor. CYT-18 is capable of splicing multiple group I introns from a wide variety of sources by stabilizing the catalytically active intron structures. CYT-18 and mt TyrRSs from related fungal species have evolved to assist in group I intron splicing in part by the accumulation of three N-terminal domain insertions. Biochemical and structural analysis indicate that the N-terminal insertions serve primarily to create a structure-stabilizing scaffold for critical tertiary interactions between the two major RNA domains of group I introns. Previous studies concluded that the primarily alpha-helical N-terminal insertion, H0, contributes to protein stability and is necessary for splicing the N. crassa ND1 intron but is dispensable for splicing the N. crassa mitochondrial LSU intron. Here, we show that CYT-18 with a complete H0 deletion retains residual ND1 intron splicing activity and that addition of the missing N-terminus in trans is capable of restoring a significant portion of its splicing activity. The development of this peptide complementation assay has allowed us to explore important characteristics of the CYT-18/group I intron interaction including the stoichiometry of H0 in intron splicing and the importance of specific H0 residues. Evaluation of truncated H0 peptides in this assay and a re-examination of the CYT-18 crystal structure suggest a previously unknown structural role of the first five N-terminal residues of CYT-18. These residues interact directly with another splicing insertion, making H0 a central structural element responsible for connecting all three N-terminal splicing insertions. | ||
| - | + | An in vitro peptide complementation assay for CYT-18-dependent group I intron splicing reveals a new role for the N-terminus.,Geng C, Paukstelis PJ Biochemistry. 2014 Mar 4;53(8):1311-9. doi: 10.1021/bi401614h. Epub 2014 Feb 24. PMID:24520960<ref>PMID:24520960</ref> | |
| - | + | ||
| - | == | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| - | + | </div> | |
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Neucr]] | ||
[[Category: Tyrosine--tRNA ligase]] | [[Category: Tyrosine--tRNA ligase]] | ||
| - | [[Category: Geng, C | + | [[Category: Geng, C]] |
| - | [[Category: Paukstelis, P J | + | [[Category: Paukstelis, P J]] |
[[Category: Ligase]] | [[Category: Ligase]] | ||
[[Category: Splicing]] | [[Category: Splicing]] | ||
[[Category: Trna ligase]] | [[Category: Trna ligase]] | ||
[[Category: Tyrr]] | [[Category: Tyrr]] | ||
Revision as of 14:02, 24 December 2014
Crystal structure of a C-terminally truncated CYT-18 protein including N-terminal residues
| |||||||||||
Categories: Neucr | Tyrosine--tRNA ligase | Geng, C | Paukstelis, P J | Ligase | Splicing | Trna ligase | Tyrr
