1mg2

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(New page: 200px<br /><applet load="1mg2" size="450" color="white" frame="true" align="right" spinBox="true" caption="1mg2, resolution 2.25&Aring;" /> '''MUTATION OF ALPHA PH...)
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[[Image:1mg2.gif|left|200px]]<br /><applet load="1mg2" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1mg2, resolution 2.25&Aring;" />
 
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'''MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN'''<br />
 
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==Overview==
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==MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN==
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Methylamine dehydrogenase (MADH) possesses an alpha(2)beta(2) structure, with each smaller beta subunit possessing a tryptophan tryptophylquinone, (TTQ) prosthetic group. Phe55 of the alpha subunit is located where the, substrate channel from the enzyme surface opens into the active site., Site-directed mutagenesis of alphaPhe55 has revealed roles for this, residue in determining substrate specificity and binding monovalent, cations at the active site. It is now shown that the alphaF55A mutation, also increases the rate of the true electron transfer (ET) reaction from, O-quinol MADH to amicyanin. The reorganization energy associated with the, ET reaction is decreased from 2.3 to 1.8 eV. The electronic coupling, associated with the ET reaction is decreased from 12 to 3 cm(-1). The, crystal structure of alphaF55A MADH in complex with its electron, acceptors, amicyanin and cytochrome c-551i, has been determined. Little, difference in the overall structure is seen, relative to the native, complex; however, there are significant changes in the solvent content of, the active site and substrate channel. The crystal structure of alphaF55A, MADH has also been determined with phenylhydrazine covalently bound to TTQ, in the active site. Phenylhydrazine binding significantly perturbs the, orientation of the TTQ rings relative to each other. The ET results are, discussed in the context of the new and old crystal structures of the, native and mutant enzymes.
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<StructureSection load='1mg2' size='340' side='right'caption='[[1mg2]], [[Resolution|resolution]] 2.25&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1mg2]] is a 16 chain structure with sequence from [https://en.wikipedia.org/wiki/Paracoccus_denitrificans Paracoccus denitrificans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MG2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MG2 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]] 2.25&#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=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=TRQ:2-AMINO-3-(6,7-DIOXO-6,7-DIHYDRO-1H-INDOL-3-YL)-PROPIONIC+ACID'>TRQ</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=1mg2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mg2 OCA], [https://pdbe.org/1mg2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mg2 RCSB], [https://www.ebi.ac.uk/pdbsum/1mg2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mg2 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/DHMH_PARDE DHMH_PARDE] Methylamine dehydrogenase carries out the oxidation of methylamine. Electrons are passed from methylamine dehydrogenase to amicyanin.
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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/mg/1mg2_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=1mg2 ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1MG2 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Paracoccus_denitrificans Paracoccus denitrificans] with CU, PO4, NA and HEM as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Amine_dehydrogenase Amine dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.4.99.3 1.4.99.3] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1MG2 OCA].
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*[[Amicyanin 3D structures|Amicyanin 3D structures]]
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*[[Cytochrome C 3D structures|Cytochrome C 3D structures]]
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==Reference==
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*[[Methylamine dehydrogenase|Methylamine dehydrogenase]]
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Mutation of alphaPhe55 of methylamine dehydrogenase alters the reorganization energy and electronic coupling for its electron transfer reaction with amicyanin., Sun D, Chen ZW, Mathews FS, Davidson VL, Biochemistry. 2002 Nov 26;41(47):13926-33. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12437349 12437349]
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__TOC__
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[[Category: Amine dehydrogenase]]
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Paracoccus denitrificans]]
[[Category: Paracoccus denitrificans]]
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[[Category: Protein complex]]
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[[Category: Chen ZW]]
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[[Category: Chen, Z.W.]]
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[[Category: Davidson VL]]
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[[Category: Davidson, V.L.]]
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[[Category: Mathews FS]]
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[[Category: Mathews, F.S.]]
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[[Category: Sun D]]
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[[Category: Sun, D.]]
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[[Category: CU]]
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[[Category: HEM]]
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[[Category: NA]]
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[[Category: PO4]]
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[[Category: active site mutant]]
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[[Category: blue copper protein]]
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[[Category: cytochrome]]
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[[Category: electron transfer]]
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[[Category: methylamine dehydrogenase]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 21:23:38 2007''
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Current revision

MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN

PDB ID 1mg2

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