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| | <StructureSection load='4ymk' size='340' side='right'caption='[[4ymk]], [[Resolution|resolution]] 2.60Å' scene=''> | | <StructureSection load='4ymk' size='340' side='right'caption='[[4ymk]], [[Resolution|resolution]] 2.60Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4ymk]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YMK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4YMK FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4ymk]] is a 2 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=4YMK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4YMK FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MPG:[(Z)-OCTADEC-9-ENYL]+(2R)-2,3-BIS(OXIDANYL)PROPANOATE'>MPG</scene>, <scene name='pdbligand=ST9:STEAROYL-COENZYME+A'>ST9</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MPG:[(Z)-OCTADEC-9-ENYL]+(2R)-2,3-BIS(OXIDANYL)PROPANOATE'>MPG</scene>, <scene name='pdbligand=ST9:STEAROYL-COENZYME+A'>ST9</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Scd1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</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=4ymk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ymk OCA], [https://pdbe.org/4ymk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ymk RCSB], [https://www.ebi.ac.uk/pdbsum/4ymk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ymk ProSAT]</span></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Stearoyl-CoA_9-desaturase Stearoyl-CoA 9-desaturase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.14.19.1 1.14.19.1] </span></td></tr>
| + | |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ymk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ymk OCA], [http://pdbe.org/4ymk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4ymk RCSB], [http://www.ebi.ac.uk/pdbsum/4ymk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4ymk ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/ACOD1_MOUSE ACOD1_MOUSE]] Terminal component of the liver microsomal stearyl-CoA desaturase system, that utilizes O(2) and electrons from reduced cytochrome b5 to catalyze the insertion of a double bond into a spectrum of fatty acyl-CoA substrates including palmitoyl-CoA and stearoyl-CoA. | + | [https://www.uniprot.org/uniprot/ACOD1_MOUSE ACOD1_MOUSE] Terminal component of the liver microsomal stearyl-CoA desaturase system, that utilizes O(2) and electrons from reduced cytochrome b5 to catalyze the insertion of a double bond into a spectrum of fatty acyl-CoA substrates including palmitoyl-CoA and stearoyl-CoA. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Lk3 transgenic mice]] | + | [[Category: Mus musculus]] |
| - | [[Category: Stearoyl-CoA 9-desaturase]]
| + | [[Category: Bai Y]] |
| - | [[Category: Bai, Y]] | + | [[Category: McCoy JG]] |
| - | [[Category: McCoy, J G]] | + | [[Category: Rajashankar KR]] |
| - | [[Category: Rajashankar, K R]] | + | [[Category: Zhou M]] |
| - | [[Category: Zhou, M]] | + | |
| - | [[Category: Dimetal center]]
| + | |
| - | [[Category: Oxidoreductase]]
| + | |
| Structural highlights
Function
ACOD1_MOUSE Terminal component of the liver microsomal stearyl-CoA desaturase system, that utilizes O(2) and electrons from reduced cytochrome b5 to catalyze the insertion of a double bond into a spectrum of fatty acyl-CoA substrates including palmitoyl-CoA and stearoyl-CoA.
Publication Abstract from PubMed
Stearoyl-CoA desaturase (SCD) is conserved in all eukaryotes and introduces the first double bond into saturated fatty acyl-CoAs. Because the monounsaturated products of SCD are key precursors of membrane phospholipids, cholesterol esters and triglycerides, SCD is pivotal in fatty acid metabolism. Humans have two SCD homologues (SCD1 and SCD5), while mice have four (SCD1-SCD4). SCD1-deficient mice do not become obese or diabetic when fed a high-fat diet because of improved lipid metabolic profiles and insulin sensitivity. Thus, SCD1 is a pharmacological target in the treatment of obesity, diabetes and other metabolic diseases. SCD1 is an integral membrane protein located in the endoplasmic reticulum, and catalyses the formation of a cis-double bond between the ninth and tenth carbons of stearoyl- or palmitoyl-CoA. The reaction requires molecular oxygen, which is activated by a di-iron centre, and cytochrome b5, which regenerates the di-iron centre. To understand better the structural basis of these characteristics of SCD function, here we crystallize and solve the structure of mouse SCD1 bound to stearoyl-CoA at 2.6 A resolution. The structure shows a novel fold comprising four transmembrane helices capped by a cytosolic domain, and a plausible pathway for lateral substrate access and product egress. The acyl chain of the bound stearoyl-CoA is enclosed in a tunnel buried in the cytosolic domain, and the geometry of the tunnel and the conformation of the bound acyl chain provide a structural basis for the regioselectivity and stereospecificity of the desaturation reaction. The dimetal centre is coordinated by a unique spacial arrangement of nine conserved histidine residues that implies a potentially novel mechanism for oxygen activation. The structure also illustrates a possible route for electron transfer from cytochrome b5 to the di-iron centre.
X-ray structure of a mammalian stearoyl-CoA desaturase.,Bai Y, McCoy JG, Levin EJ, Sobrado P, Rajashankar KR, Fox BG, Zhou M Nature. 2015 Jun 22. doi: 10.1038/nature14549. PMID:26098370[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Bai Y, McCoy JG, Levin EJ, Sobrado P, Rajashankar KR, Fox BG, Zhou M. X-ray structure of a mammalian stearoyl-CoA desaturase. Nature. 2015 Jun 22. doi: 10.1038/nature14549. PMID:26098370 doi:http://dx.doi.org/10.1038/nature14549
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