1g6n

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(New page: 200px<br /><applet load="1g6n" size="450" color="white" frame="true" align="right" spinBox="true" caption="1g6n, resolution 2.1&Aring;" /> '''2.1 ANGSTROM STRUCTUR...)
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[[Image:1g6n.jpg|left|200px]]<br /><applet load="1g6n" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1g6n, resolution 2.1&Aring;" />
 
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'''2.1 ANGSTROM STRUCTURE OF CAP-CAMP'''<br />
 
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==Overview==
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==2.1 ANGSTROM STRUCTURE OF CAP-CAMP==
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After an allosteric transition produced by the binding of cyclic AMP, (cAMP), the Escherichia coli catabolite gene activator protein (CAP) binds, DNA specifically and activates transcription. The three-dimensional, crystal structure of the CAP-cAMP complex has been refined at 2.1 A, resolution, thus enabling a better evaluation of the structural basis for, CAP phenotypes, the interactions of cAMP with CAP and the roles played by, water structure. A review of mutational analysis of CAP together with the, additional structural information presented here suggests a possible, mechanism for the cAMP-induced allostery required for DNA binding and, transcriptional activation. We hypothesize that cAMP binding may reorient, the coiled-coil C-helices, which provide most of the dimer interface, thereby altering the relative positions of the DNA-binding domains of the, CAP dimer. Additionally, cAMP binding may cause a further rearrangement of, the DNA-binding and cAMP-binding domains of CAP via a flap consisting of, beta-strands 4 and 5 which lies over the cAMP.
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<StructureSection load='1g6n' size='340' side='right'caption='[[1g6n]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1g6n]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. This structure supersedes the now removed PDB entries [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=3gap 3gap] and [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1gap 1gap]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G6N OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1G6N 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]] 2.1&#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=CMP:ADENOSINE-3,5-CYCLIC-MONOPHOSPHATE'>CMP</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=1g6n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g6n OCA], [https://pdbe.org/1g6n PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1g6n RCSB], [https://www.ebi.ac.uk/pdbsum/1g6n PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1g6n ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CRP_ECOLI CRP_ECOLI] This protein complexes with cyclic AMP and binds to specific DNA sites near the promoter to regulate the transcription of several catabolite-sensitive operons. The protein induces a severe bend in the DNA. Acts as a negative regulator of its own synthesis as well as for adenylate cyclase (cyaA), which generates cAMP.<ref>PMID:2982847</ref>
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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/g6/1g6n_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=1g6n 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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After an allosteric transition produced by the binding of cyclic AMP (cAMP), the Escherichia coli catabolite gene activator protein (CAP) binds DNA specifically and activates transcription. The three-dimensional crystal structure of the CAP-cAMP complex has been refined at 2.1 A resolution, thus enabling a better evaluation of the structural basis for CAP phenotypes, the interactions of cAMP with CAP and the roles played by water structure. A review of mutational analysis of CAP together with the additional structural information presented here suggests a possible mechanism for the cAMP-induced allostery required for DNA binding and transcriptional activation. We hypothesize that cAMP binding may reorient the coiled-coil C-helices, which provide most of the dimer interface, thereby altering the relative positions of the DNA-binding domains of the CAP dimer. Additionally, cAMP binding may cause a further rearrangement of the DNA-binding and cAMP-binding domains of CAP via a flap consisting of beta-strands 4 and 5 which lies over the cAMP.
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==About this Structure==
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Modeling the cAMP-induced allosteric transition using the crystal structure of CAP-cAMP at 2.1 A resolution.,Passner JM, Schultz SC, Steitz TA J Mol Biol. 2000 Dec 15;304(5):847-59. PMID:11124031<ref>PMID:11124031</ref>
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1G6N 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 CMP as [http://en.wikipedia.org/wiki/ligand ligand]. This structure superseeds the now removed PDB entries 3GAP and 1GAP. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1G6N 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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Modeling the cAMP-induced allosteric transition using the crystal structure of CAP-cAMP at 2.1 A resolution., Passner JM, Schultz SC, Steitz TA, J Mol Biol. 2000 Dec 15;304(5):847-59. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11124031 11124031]
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</div>
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[[Category: Escherichia coli]]
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<div class="pdbe-citations 1g6n" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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[[Category: Passner, J.M.]]
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[[Category: Schultz, S.C.]]
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[[Category: Steitz, T.A.]]
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[[Category: CMP]]
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[[Category: allostery]]
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[[Category: camp]]
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[[Category: camp receptor protein (crp)]]
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[[Category: catabolite activator protein (cap)]]
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[[Category: cyclic amp]]
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[[Category: transcription]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 10:55:19 2007''
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==See Also==
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*[[Catabolite gene activator protein 3D structures|Catabolite gene activator protein 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: Passner JM]]
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[[Category: Schultz SC]]
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[[Category: Steitz TA]]

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2.1 ANGSTROM STRUCTURE OF CAP-CAMP

PDB ID 1g6n

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