1amu

<StructureSection load='1amu' size='340' side='right' caption='[[1amu]], [[Resolution|resolution]] 1.90&Aring;' scene=''>

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

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PHE:PHENYLALANINE'>PHE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Phenylalanine_racemase_(ATP-hydrolyzing) Phenylalanine racemase (ATP-hydrolyzing)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.1.1.11 5.1.1.11] </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=1amu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1amu OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1amu RCSB], [http://www.ebi.ac.uk/pdbsum/1amu PDBsum]</span></td></tr>

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/am/1amu_consurf.spt"</scriptWhenChecked>

</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].

<div style="background-color:#fffaf0;">

== Publication Abstract from PubMed ==

The non-ribosomal synthesis of the cyclic peptide antibiotic gramicidin S is accomplished by two large multifunctional enzymes, the peptide synthetases 1 and 2. The enzyme complex contains five conserved subunits of approximately 60 kDa which carry out ATP-dependent activation of specific amino acids and share extensive regions of sequence similarity with adenylating enzymes such as firefly luciferases and acyl-CoA ligases. We have determined the crystal structure of the N-terminal adenylation subunit in a complex with AMP and L-phenylalanine to 1.9 A resolution. The 556 amino acid residue fragment is folded into two domains with the active site situated at their interface. Each domain of the enzyme has a similar topology to the corresponding domain of unliganded firefly luciferase, but a remarkable relative domain rotation of 94 degrees occurs. This conformation places the absolutely conserved Lys517 in a position to form electrostatic interactions with both ligands. The AMP is bound with the phosphate moiety interacting with Lys517 and the hydroxyl groups of the ribose forming hydrogen bonds with Asp413. The phenylalanine substrate binds in a hydrophobic pocket with the carboxylate group interacting with Lys517 and the alpha-amino group with Asp235. The structure reveals the role of the invariant residues within the superfamily of adenylate-forming enzymes and indicates a conserved mechanism of nucleotide binding and substrate activation.

Structural basis for the activation of phenylalanine in the non-ribosomal biosynthesis of gramicidin S.,Conti E, Stachelhaus T, Marahiel MA, Brick P EMBO J. 1997 Jul 16;16(14):4174-83. PMID:9250661<ref>PMID:9250661</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

</div>

== References ==

<references/>

[[Category: Brick, P]]

[[Category: Conti, E]]

[[Category: Marahiel, M A]]

[[Category: Stachelhaus, T]]

[[Category: Peptide synthetase]]