View source for 3drh


==Crystal structure of Lactococcal OppA co-crystallized with Leu-enkephalin in an open conformation==
<StructureSection load='3drh' size='340' side='right' caption='[[3drh]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3drh]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Laclm Laclm]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3DRH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3DRH FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3drf|3drf]], [[3drg|3drg]], [[3dri|3dri]], [[3drj|3drj]], [[3drk|3drk]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">oppA, llmg_0701 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=416870 LACLM])</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=3drh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3drh OCA], [http://pdbe.org/3drh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3drh RCSB], [http://www.ebi.ac.uk/pdbsum/3drh PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3drh ProSAT]</span></td></tr>
</table>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/dr/3drh_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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/main_output.php?pdb_ID=3drh ConSurf].
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== Publication Abstract from PubMed ==
Oligopeptide-binding protein A (OppA) from Lactococcus lactis binds peptides of an exceptionally wide range of lengths (4-35 residues), with no apparent sequence preference. Here, we present the crystal structures of OppA in the open- and closed-liganded conformations. The structures directly explain the protein's phenomenal promiscuity. A huge cavity allows binding of very long peptides, and a lack of constraints for the position of the N and C termini of the ligand is compatible with binding of peptides with varying lengths. Unexpectedly, the peptide's amino-acid composition (but not the exact sequence) appears to have a function in selection, with a preference for proline-rich peptides containing at least one isoleucine. These properties can be related to the physiology of the organism: L. lactis is auxotrophic for branched chain amino acids and favours proline-rich caseins as a source of amino acids. We propose a new mechanism for peptide selection based on amino-acid composition rather than sequence.

The structural basis for peptide selection by the transport receptor OppA.,Berntsson RP, Doeven MK, Fusetti F, Duurkens RH, Sengupta D, Marrink SJ, Thunnissen AM, Poolman B, Slotboom DJ EMBO J. 2009 Mar 19. PMID:19300437<ref>PMID:19300437</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3drh" style="background-color:#fffaf0;"></div>

==See Also==
*[[Oligopeptide-binding protein|Oligopeptide-binding protein]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Laclm]]
[[Category: Berntsson, R P.A]]
[[Category: Doeven, M K]]
[[Category: Duurkens, R H]]
[[Category: Marrink, S J]]
[[Category: Poolman, B]]
[[Category: Sengupta, D]]
[[Category: Slotboom, D J]]
[[Category: Thunnissen, A M]]
[[Category: Oligo-peptide binding]]
[[Category: Peptide binding protein]]
[[Category: Venus fly-trap]]
[[Category: Voluminous binding cavity]]