1uio

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(New page: 200px<br /><applet load="1uio" size="450" color="white" frame="true" align="right" spinBox="true" caption="1uio, resolution 2.4&Aring;" /> '''ADENOSINE DEAMINASE (...)
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[[Image:1uio.jpg|left|200px]]<br /><applet load="1uio" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1uio, resolution 2.4&Aring;" />
 
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'''ADENOSINE DEAMINASE (HIS 238 ALA MUTANT)'''<br />
 
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==Overview==
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==ADENOSINE DEAMINASE (HIS 238 ALA MUTANT)==
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His 238, a conserved amino acid located in hydrogen-bonding distance from, C-6 of the substrate in the active site of murine adenosine deaminase, (mADA) and postulated to play an important role in catalysis, was altered, into an alanine, a glutamate, and an arginine using site-directed, mutagenesis. The Ala and Glu substitutions did not result in changes of, the secondary or tertiary structure, while the Arg mutation caused local, perturbations in tertiary structure and quenched the emission of one or, more enzyme tryptophans. Neither the Glu or Arg mutations affected, substrate binding affinity. By contrast, the Ala mutation enhanced, substrate and inhibitor binding by 20-fold. The most inactive of the, mutants, Glu 238, had a kcat/K(m) 4 x 10(-6) lower than the wild-type, value, suggesting that a positive charge on His 238 is important for, proper catalytic function. The Ala 238 mutant was the most active ADA, with a kcat/K(m) 2 x 10(-3) lower than the wild-type value. NMR, spectroscopy and crystallography revealed that this mutant is able to, catalyze hydration of purine riboside, a ground-state analog of the, reaction. These results collectively show that His 238 is not required for, formation of the hydroxylate used in the deamination and may instead have, an important electrostatic role.
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<StructureSection load='1uio' size='340' side='right'caption='[[1uio]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1uio]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UIO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1UIO 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]] 2.4&#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=HPR:6-HYDROXY-7,8-DIHYDRO+PURINE+NUCLEOSIDE'>HPR</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=1uio FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1uio OCA], [https://pdbe.org/1uio PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1uio RCSB], [https://www.ebi.ac.uk/pdbsum/1uio PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1uio ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/ADA_MOUSE ADA_MOUSE] Catalyzes the hydrolytic deamination of adenosine and 2-deoxyadenosine. Plays an important role in purine metabolism and in adenosine homeostasis. Modulates signaling by extracellular adenosine, and so contributes indirectly to cellular signaling events. Acts as a positive regulator of T-cell coactivation, by binding DPP4. Its interaction with DPP4 regulates lymphocyte-epithelial cell adhesion (By similarity).
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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/ui/1uio_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=1uio 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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1UIO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with ZN and HPR as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Adenosine_deaminase Adenosine deaminase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.4.4 3.5.4.4] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1UIO OCA].
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*[[Adenosine deaminase 3D structures|Adenosine deaminase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Site-directed mutagenesis of histidine 238 in mouse adenosine deaminase: substitution of histidine 238 does not impede hydroxylate formation., Sideraki V, Wilson DK, Kurz LC, Quiocho FA, Rudolph FB, Biochemistry. 1996 Nov 26;35(47):15019-28. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8942668 8942668]
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[[Category: Large Structures]]
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[[Category: Adenosine deaminase]]
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[[Category: Mus musculus]]
[[Category: Mus musculus]]
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[[Category: Single protein]]
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[[Category: Quiocho FA]]
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[[Category: Quiocho, F.A.]]
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[[Category: Wilson DK]]
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[[Category: Wilson, D.K.]]
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[[Category: HPR]]
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[[Category: ZN]]
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[[Category: hydrolase]]
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[[Category: nucleotide metabolism]]
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[[Category: zinc cofactor tim barrel]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 04:09:38 2007''
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Current revision

ADENOSINE DEAMINASE (HIS 238 ALA MUTANT)

PDB ID 1uio

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