3tcg

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[[Image:3tcg.png|left|200px]]
 
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==Crystal structure of E. coli OppA complexed with the tripeptide KGE==
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The line below this paragraph, containing "STRUCTURE_3tcg", creates the "Structure Box" on the page.
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<StructureSection load='3tcg' size='340' side='right'caption='[[3tcg]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[3tcg]] is a 16 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TCG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3TCG FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3tcg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3tcg OCA], [https://pdbe.org/3tcg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3tcg RCSB], [https://www.ebi.ac.uk/pdbsum/3tcg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3tcg ProSAT]</span></td></tr>
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{{STRUCTURE_3tcg| PDB=3tcg | SCENE= }}
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/OPPA_ECOLI OPPA_ECOLI] This protein is a component of the oligopeptide permease, a binding protein-dependent transport system, it binds peptides up to five amino acids long with high affinity.
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The Escherichia coli peptide binding protein OppA is an essential component of the oligopeptide transporter Opp. Based on studies on its orthologue from Salmonella typhimurium, it has been proposed that OppA binds peptides between two and five amino acids long, with no apparent sequence selectivity. Here, we studied peptide binding to E. coli OppA directly and show that the protein has an unexpected preference for basic peptides. OppA was expressed in the periplasm, where it bound to available peptides. The protein was purified in complex with tightly bound peptides. The crystal structure (up to 2.0 A) of OppA liganded with the peptides indicated that the protein has a preference for peptides containing a lysine. Mass spectrometry analysis of the bound peptides showed that peptides between two and five amino acids long bind to the protein and indeed hinted at a preference for positively charged peptides. The preference of OppA for peptides with basic residues, in particular lysines, was corroborated by binding studies with peptides of defined sequence using isothermal titration calorimetry and intrinsic protein fluorescence titration. The protein bound tripeptides and tetrapeptides containing positively charged residues with high affinity, whereas related peptides without lysines/arginines were bound with low affinity. A structure of OppA in an open conformation in the absence of ligands was also determined to 2.0 A, revealing that the initial binding site displays a negative surface charge, consistent with the observed preference for positively charged peptides. Taken together, E. coli OppA appears to have a preference for basic peptides.
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===Crystal structure of E. coli OppA complexed with the tripeptide KGE===
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Escherichia coli peptide binding protein OppA has a preference for positively charged peptides.,Klepsch MM, Kovermann M, Low C, Balbach J, Permentier HP, Fusetti F, de Gier JW, Slotboom DJ, Berntsson RP J Mol Biol. 2011 Nov 18;414(1):75-85. Epub 2011 Oct 1. PMID:21983341<ref>PMID:21983341</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 3tcg" style="background-color:#fffaf0;"></div>
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==See Also==
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The line below this paragraph, {{ABSTRACT_PUBMED_21983341}}, adds the Publication Abstract to the page
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*[[ABC transporter 3D structures|ABC transporter 3D structures]]
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(as it appears on PubMed at http://www.pubmed.gov), where 21983341 is the PubMed ID number.
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== References ==
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<references/>
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{{ABSTRACT_PUBMED_21983341}}
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__TOC__
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</StructureSection>
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==About this Structure==
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[[Category: Escherichia coli K-12]]
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[[3tcg]] is a 16 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TCG OCA].
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[[Category: Large Structures]]
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[[Category: Balbach J]]
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==Reference==
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[[Category: Berntsson RP-A]]
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<ref group="xtra">PMID:021983341</ref><references group="xtra"/>
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[[Category: Klepsch MM]]
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[[Category: Escherichia coli]]
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[[Category: Kovermann M]]
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[[Category: Balbach, J.]]
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[[Category: Low C]]
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[[Category: Berntsson, R P.A.]]
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[[Category: Slotboom DJ]]
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[[Category: Gier, J W.de.]]
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[[Category: De Gier JW]]
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[[Category: Klepsch, M M.]]
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[[Category: Kovermann, M.]]
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[[Category: Low, C.]]
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[[Category: Slotboom, D J.]]
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[[Category: Abc transporter]]
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[[Category: Peptide transport]]
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[[Category: Peptide-binding domain]]
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[[Category: Peptide-binding protein]]
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[[Category: Protein transport]]
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Current revision

Crystal structure of E. coli OppA complexed with the tripeptide KGE

PDB ID 3tcg

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