1nj8

<StructureSection load='1nj8' size='340' side='right' caption='[[1nj8]], [[Resolution|resolution]] 3.20&Aring;' scene=''>

<table><tr><td colspan='2'>[[1nj8]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_43067 Atcc 43067]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NJ8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1NJ8 FirstGlance]. <br>

</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1nj1|1nj1]], [[1nj2|1nj2]], [[1nj5|1nj5]], [[1nj6|1nj6]]</td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MJ1238 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=2190 ATCC 43067])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Proline--tRNA_ligase Proline--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.15 6.1.1.15] </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=1nj8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nj8 OCA], [http://pdbe.org/1nj8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1nj8 RCSB], [http://www.ebi.ac.uk/pdbsum/1nj8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1nj8 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/SYP_METJA SYP_METJA]] Catalyzes the attachment of proline to tRNA(Pro) in a two-step reaction: proline is first activated by ATP to form Pro-AMP and then transferred to the acceptor end of tRNA(Pro). Can inadvertently accommodate and process non-cognate amino acids such as cysteine and alanine.<ref>PMID:10642548</ref> <ref>PMID:10869184</ref> <ref>PMID:11141055</ref> <ref>PMID:11866507</ref>

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== Publication Abstract from PubMed ==

Cysteinyl-tRNA synthetase is an essential enzyme required for protein synthesis. Genes encoding this protein have not been identified in Methanocaldococcus jannaschii, Methanothermobacter thermautotrophicus, or Methanopyrus kandleri. It has previously been proposed that the prolyl-tRNA synthetase (ProRS) enzymes in these organisms recognize either proline or cysteine and can aminoacylate their cognate tRNAs through a dual-specificity mechanism. We report five crystal structures at resolutions between 2.6 and 3.2 A: apo M. jannaschii ProRS, and M. thermautotrophicus ProRS in apo form and in complex with cysteinyl-sulfamoyl-, prolyl-sulfamoyl-, and alanyl-sulfamoyl-adenylates. These aminoacyl-adenylate analogues bind to a single active-site pocket and induce an identical set of conformational changes in loops around the active site when compared with the ligand-free conformation of ProRS. The cysteinyl- and prolyl-adenylate analogues have similar, nanomolar affinities for M. thermautotrophicus ProRS. Homology modeling of tRNA onto these adenylate complexes places the 3'-OH of A76 in an appropriate position for the transfer of any of the three amino acids to tRNA. Thus, these structures explain recent biochemical experiments showing that M. jannaschii ProRS misacylates tRNA(Pro) with cysteine, and argue against the proposal that these archaeal ProRS enzymes possess the dual capacity to aminoacylate both tRNA(Pro) and tRNA(Cys) with their cognate amino acids.

 

<div class="pdbe-citations 1nj8" style="background-color:#fffaf0;"></div>

[[Category: Atcc 43067]]

[[Category: Proline--tRNA ligase]]

[[Category: Kamtekar, S]]

[[Category: Kennedy, W D]]

[[Category: Soll, D]]

[[Category: Stathopoulos, C]]

[[Category: Steitz, T A]]

[[Category: Wang, J]]

[[Category: Ligase]]