1mpm

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(New page: 200px<br /><applet load="1mpm" size="450" color="white" frame="true" align="right" spinBox="true" caption="1mpm, resolution 2.6&Aring;" /> '''MALTOPORIN MALTOSE CO...)
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[[Image:1mpm.jpg|left|200px]]<br /><applet load="1mpm" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1mpm, resolution 2.6&Aring;" />
 
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'''MALTOPORIN MALTOSE COMPLEX'''<br />
 
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==Overview==
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==MALTOPORIN MALTOSE COMPLEX==
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BACKGROUND: Maltoporin (which is encoded by the lamB gene) facilitates the, translocation of maltodextrins across the outer membrane of E. coli. In, particular, it is indispensable for the transport of long, maltooligosaccharides, as these do not pass through non-specific porins., An understanding of this intriguing capability requires elucidation of the, structural basis. RESULTS: The crystal structures of maltoporin in complex, with maltose, maltotriose and maltohexaose reveal an extended binding site, within the maltoporin channel. The maltooligosaccharides are in apolar van, der Waals contact with the 'greasy slide', a hydrophobic path that is, composed of aromatic residues and located at the channel lining. At the, constriction of the channel the sugars are tightly surrounded by protein, side chains and form an extensive hydrogen-bonding network with ionizable, amino-acid residues. CONCLUSION: Hydrophobic interactions with the greasy, slide guide the sugar into and through the channel constriction. The, glucosyl-binding subsites at the channel constriction confer, stereospecificity to the channel along with the ability to scavenge, substrate at low concentrations.
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<StructureSection load='1mpm' size='340' side='right'caption='[[1mpm]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1mpm]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MPM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MPM 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]] 2.6&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PRD_900018:beta-maltose'>PRD_900018</scene></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=1mpm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mpm OCA], [https://pdbe.org/1mpm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mpm RCSB], [https://www.ebi.ac.uk/pdbsum/1mpm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mpm ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/LAMB_ECOLI LAMB_ECOLI] Involved in the transport of maltose and maltodextrins, indispensable for translocation of dextrins containing more than three glucosyl moieties. A hydrophobic path ("greasy slide") of aromatic residues serves to guide and select the sugars for transport through the channel. Also acts as a receptor for several bacteriophages including lambda.[HAMAP-Rule:MF_01301]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mp/1mpm_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1mpm ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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BACKGROUND: Maltoporin (which is encoded by the lamB gene) facilitates the translocation of maltodextrins across the outer membrane of E. coli. In particular, it is indispensable for the transport of long maltooligosaccharides, as these do not pass through non-specific porins. An understanding of this intriguing capability requires elucidation of the structural basis. RESULTS: The crystal structures of maltoporin in complex with maltose, maltotriose and maltohexaose reveal an extended binding site within the maltoporin channel. The maltooligosaccharides are in apolar van der Waals contact with the 'greasy slide', a hydrophobic path that is composed of aromatic residues and located at the channel lining. At the constriction of the channel the sugars are tightly surrounded by protein side chains and form an extensive hydrogen-bonding network with ionizable amino-acid residues. CONCLUSION: Hydrophobic interactions with the greasy slide guide the sugar into and through the channel constriction. The glucosyl-binding subsites at the channel constriction confer stereospecificity to the channel along with the ability to scavenge substrate at low concentrations.
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==About this Structure==
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Crystal structures of various maltooligosaccharides bound to maltoporin reveal a specific sugar translocation pathway.,Dutzler R, Wang YF, Rizkallah P, Rosenbusch JP, Schirmer T Structure. 1996 Feb 15;4(2):127-34. PMID:8805519<ref>PMID:8805519</ref>
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1MPM is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with MG as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1MPM OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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Crystal structures of various maltooligosaccharides bound to maltoporin reveal a specific sugar translocation pathway., Dutzler R, Wang YF, Rizkallah P, Rosenbusch JP, Schirmer T, Structure. 1996 Feb 15;4(2):127-34. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8805519 8805519]
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</div>
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[[Category: Escherichia coli]]
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<div class="pdbe-citations 1mpm" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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[[Category: Dutzler, R.]]
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[[Category: Schirmer, T.]]
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[[Category: MG]]
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[[Category: beta barrel]]
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[[Category: membrane protein]]
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[[Category: specific porin]]
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[[Category: sugar transport]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 21:36:52 2007''
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==See Also==
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*[[Porin 3D structures|Porin 3D structures]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Escherichia coli]]
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[[Category: Large Structures]]
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[[Category: Dutzler R]]
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[[Category: Schirmer T]]

Current revision

MALTOPORIN MALTOSE COMPLEX

PDB ID 1mpm

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