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| ==PBP AccA from A. tumefaciens C58 in complex with agrocin 84== | | ==PBP AccA from A. tumefaciens C58 in complex with agrocin 84== |
| <StructureSection load='4zec' size='340' side='right' caption='[[4zec]], [[Resolution|resolution]] 2.15Å' scene=''> | | <StructureSection load='4zec' size='340' side='right'caption='[[4zec]], [[Resolution|resolution]] 2.15Å' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[4zec]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ZEC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ZEC FirstGlance]. <br> | | <table><tr><td colspan='2'>[[4zec]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Agrobacterium_fabrum_str._C58 Agrobacterium fabrum str. C58]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ZEC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ZEC FirstGlance]. <br> |
| </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=C84:[(2S,3R,4S,5S,6R)-6-(hydroxymethyl)-2,4,5-tris(oxidanyl)oxan-3-yl]oxy-N-[9-[(2R,3S,5R)-5-[[[(2R,3S)-4-methyl-2,3-bis(oxidanyl)pentanoyl]amino]-oxidanyl-phosphoryl]oxy-3-oxidanyl-oxolan-2-yl]purin-6-yl]phosphonamidic+acid'>C84</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr> | | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.15Å</td></tr> |
| <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4ze8|4ze8]], [[4ze9|4ze9]], [[4zeb|4zeb]], [[4ra1|4ra1]]</td></tr>
| | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=C84:[(2R,3R,4S,5S,6R)-6-(hydroxymethyl)-2,4,5-tris(oxidanyl)oxan-3-yl]oxy-N-[9-[(2R,3S,5R)-5-[[[(2R,3S)-4-methyl-2,3-bis(oxidanyl)pentanoyl]amino]-oxidanyl-phosphoryl]oxy-3-oxidanyl-oxolan-2-yl]purin-6-yl]phosphonamidic+acid'>C84</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></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=4zec FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zec OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4zec RCSB], [http://www.ebi.ac.uk/pdbsum/4zec PDBsum]</span></td></tr> | | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4zec FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zec OCA], [https://pdbe.org/4zec PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4zec RCSB], [https://www.ebi.ac.uk/pdbsum/4zec PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4zec ProSAT]</span></td></tr> |
| </table> | | </table> |
| <div style="background-color:#fffaf0;">
| | == Function == |
| == Publication Abstract from PubMed == | | [https://www.uniprot.org/uniprot/Q52012_AGRFC Q52012_AGRFC] |
| Periplasmic binding proteins (PBPs) in association with ABC transporters select and import a wide variety of ligands into bacterial cytoplasm. They can also take up toxic molecules, as observed in the case of the phytopathogen Agrobacterium tumefaciens strain C58. This organism contains a PBP called AccA that mediates the import of the antibiotic agrocin 84, as well as the opine agrocinopine A that acts as both a nutrient and a signalling molecule for the dissemination of virulence genes through quorum-sensing. Here, we characterized the binding mode of AccA using purified agrocin 84 and synthetic agrocinopine A by X-ray crystallography at very high resolution and performed affinity measurements. Structural and affinity analyses revealed that AccA recognizes an uncommon and specific motif, a pyranose-2-phosphate moiety which is present in both imported molecules via the L-arabinopyranose moiety in agrocinopine A and the D-glucopyranose moiety in agrocin 84. We hypothesized that AccA is a gateway allowing the import of any compound possessing a pyranose-2-phosphate motif at one end. This was structurally and functionally confirmed by experiments using four synthetic compounds: agrocinopine 3'-O-benzoate, L-arabinose-2-isopropylphosphate, L-arabinose-2-phosphate and D-glucose-2-phosphate. By combining affinity measurements and in vivo assays, we demonstrated that both L-arabinose-2-phosphate and D-glucose-2-phosphate, which are the AccF mediated degradation products of agrocinopine A and agrocin 84 respectively, interact with the master transcriptional regulator AccR and activate the quorum-sensing signal synthesis and Ti plasmid transfer in A. tumefaciens C58. Our findings shed light on the role of agrocinopine and antibiotic agrocin 84 on quorum-sensing regulation in A. tumefaciens and reveal how the PBP AccA acts as vehicle for the importation of both molecules by means of a key-recognition motif. It also opens future possibilities for the rational design of antibiotic and anti-virulence compounds against A. tumefaciens or other pathogens possessing similar PBPs.
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| A Pyranose-2-Phosphate Motif Is Responsible for Both Antibiotic Import and Quorum-Sensing Regulation in Agrobacterium tumefaciens.,El Sahili A, Li SZ, Lang J, Virus C, Planamente S, Ahmar M, Guimaraes BG, Aumont-Nicaise M, Vigouroux A, Soulere L, Reader J, Queneau Y, Faure D, Morera S PLoS Pathog. 2015 Aug 5;11(8):e1005071. doi: 10.1371/journal.ppat.1005071., eCollection 2015 Aug. PMID:26244338<ref>PMID:26244338</ref>
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| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| == References ==
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| <references/>
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| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
| [[Category: Morera, S]] | | [[Category: Agrobacterium fabrum str. C58]] |
| [[Category: Sahili, A El]] | | [[Category: Large Structures]] |
| [[Category: Class c]] | | [[Category: El Sahili A]] |
| [[Category: Pbp]] | | [[Category: Morera S]] |
| [[Category: Transport protein]]
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