1ky5: Difference between revisions

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-[[Image:1ky5.gif|left|200px]]
- {{Structure
+==D244E mutant S-Adenosylhomocysteine hydrolase refined with noncrystallographic restraints==
-|PDB= 1ky5 |SIZE=350|CAPTION= <scene name='initialview01'>1ky5</scene>, resolution 2.8&Aring;
+<StructureSection load='1ky5' size='340' side='right'caption='[[1ky5]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
-|SITE=
+== Structural highlights ==
-|LIGAND= <scene name='pdbligand=NAI:1,4-DIHYDRONICOTINAMIDE+ADENINE+DINUCLEOTIDE'>NAI</scene> and <scene name='pdbligand=ADY:3'-OXO-ADENOSINE'>ADY</scene>
+<table><tr><td colspan='2'>[[1ky5]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KY5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KY5 FirstGlance]. <br>
-|ACTIVITY= [http://en.wikipedia.org/wiki/Adenosylhomocysteinase Adenosylhomocysteinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.3.1.1 3.3.1.1]
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8&#8491;</td></tr>
-|GENE=
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADY:3-OXO-ADENOSINE'>ADY</scene>, <scene name='pdbligand=NAI:1,4-DIHYDRONICOTINAMIDE+ADENINE+DINUCLEOTIDE'>NAI</scene></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=1ky5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ky5 OCA], [https://pdbe.org/1ky5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ky5 RCSB], [https://www.ebi.ac.uk/pdbsum/1ky5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ky5 ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/SAHH_RAT SAHH_RAT] Adenosylhomocysteine is a competitive inhibitor of S-adenosyl-L-methionine-dependent methyl transferase reactions; therefore adenosylhomocysteinase may play a key role in the control of methylations via regulation of the intracellular concentration of adenosylhomocysteine.
+== Evolutionary Conservation ==
+[[Image:Consurf_key_small.gif|200px|right]]
+Check<jmol>
+  <jmolCheckbox>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ky/1ky5_consurf.spt"</scriptWhenChecked>
+    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
+    <text>to colour the structure by Evolutionary Conservation</text>
+  </jmolCheckbox>
+</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=1ky5 ConSurf].
+<div style="clear:both"></div>
-'''D244E mutant S-Adenosylhomocysteine hydrolase refined with noncrystallographic restraints'''
+==See Also==
+*[[S-adenosylhomocysteine hydrolase|S-adenosylhomocysteine hydrolase]]
+__TOC__
-==Overview==
+</StructureSection>
-S-Adenosylhomocysteine hydrolase (AdoHcyase) catalyzes the hydrolysis of S-adenosylhomocysteine to form adenosine and homocysteine. On the bases of crystal structures of the wild type enzyme and the D244E mutated enzyme complexed with 3'-keto-adenosine (D244E.Ado*), we have identified the important amino acid residues, Asp-130, Lys-185, Asp-189, and Asn-190, for the catalytic reaction and have proposed a catalytic mechanism (Komoto, J., Huang, Y., Gomi, T., Ogawa, H., Takata, Y., Fujioka, M., and Takusagawa, F. (2000) J. Biol. Chem. 275, 32147-32156). To confirm the proposed catalytic mechanism, we have made the D130N, K185N, D189N, and N190S mutated enzymes and measured the catalytic activities. The catalytic rates (k(cat)) of D130N, K185N, D189N, and N190S mutated enzymes are reduced to 0.7%, 0.5%, 0.1%, and 0.5%, respectively, in comparison with the wild type enzyme, indicating that Asp-130, Lys-185, Asp-189, and Asn-190 are involved in the catalytic reaction. K(m) values of the mutated enzymes are increased significantly, except for the N190S mutation, suggesting that Asp-130, Lys-185, and Asp-189 participate in the substrate binding. To interpret the kinetic data, the oxidation states of the bound NAD molecules of the wild type and mutated enzymes were measured during the catalytic reaction by monitoring the absorbance at 340 nm. The crystal structures of the WT and D244E.Ado*, containing four subunits in the crystallographic asymmetric unit, were re-refined to have the same subunit structures. A detailed catalytic mechanism of AdoHcyase has been revealed based on the oxidation states of the bound NAD and the re-refined crystal structures of WT and D244E.Ado*. Lys-185 and Asp-130 abstract hydrogen atoms from 3'-OH and 4'-CH, respectively. Asp-189 removes a proton from Lys-185 and produces the neutral N zeta (-NH(2)), and Asn-190 facilitates formation of the neutral Lys-185. His-54 and His-300 hold and polarize a water molecule, which nucleophilically attacks the C5'- of 3'-keto-4',5'-dehydroadenosine to produce 3'-keto-Ado.
+[[Category: Large Structures]]
-==About this Structure==
-KY5 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KY5 OCA].
-==Reference==
-Catalytic mechanism of S-adenosylhomocysteine hydrolase. Site-directed mutagenesis of Asp-130, Lys-185, Asp-189, and Asn-190., Takata Y, Yamada T, Huang Y, Komoto J, Gomi T, Ogawa H, Fujioka M, Takusagawa F, J Biol Chem. 2002 Jun 21;277(25):22670-6. Epub 2002 Apr 1. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11927587 11927587]
-[[Category: Adenosylhomocysteinase]]
 [[Category: Rattus norvegicus]]
-[[Category: Single protein]]
+[[Category: Takata Y]]
-[[Category: Takata, Y.]]
+[[Category: Takusagawa F]]
-[[Category: Takusagawa, F.]]
-[[Category: ADY]]
-[[Category: NAI]]
-[[Category: hydrolase]]
-[[Category: s-adenosylhomocysteine]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 12:23:47 2008''