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| | <StructureSection load='3b06' size='340' side='right'caption='[[3b06]], [[Resolution|resolution]] 2.29Å' scene=''> | | <StructureSection load='3b06' size='340' side='right'caption='[[3b06]], [[Resolution|resolution]] 2.29Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3b06]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/'saccharolobus_shibatae' 'saccharolobus shibatae']. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3B06 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3B06 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3b06]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharolobus_shibatae Saccharolobus shibatae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3B06 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3B06 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DMA:DIMETHYLALLYL+DIPHOSPHATE'>DMA</scene>, <scene name='pdbligand=FNR:1-DEOXY-1-(7,8-DIMETHYL-2,4-DIOXO-3,4-DIHYDRO-2H-BENZO[G]PTERIDIN-1-ID-10(5H)-YL)-5-O-PHOSPHONATO-D-RIBITOL'>FNR</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.29Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3b03|3b03]], [[3b04|3b04]], [[3b05|3b05]]</div></td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DMA:DIMETHYLALLYL+DIPHOSPHATE'>DMA</scene>, <scene name='pdbligand=FNR:1-DEOXY-1-(7,8-DIMETHYL-2,4-DIOXO-3,4-DIHYDRO-2H-BENZO[G]PTERIDIN-1-ID-10(5H)-YL)-5-O-PHOSPHONATO-D-RIBITOL'>FNR</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">fni, idi ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=2286 'Saccharolobus shibatae'])</td></tr>
| + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Isopentenyl-diphosphate_Delta-isomerase Isopentenyl-diphosphate Delta-isomerase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.3.3.2 5.3.3.2] </span></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=3b06 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3b06 OCA], [https://pdbe.org/3b06 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3b06 RCSB], [https://www.ebi.ac.uk/pdbsum/3b06 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3b06 ProSAT]</span></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=3b06 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3b06 OCA], [https://pdbe.org/3b06 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3b06 RCSB], [https://www.ebi.ac.uk/pdbsum/3b06 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3b06 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/IDI2_SULSH IDI2_SULSH]] Catalyzes the 1,3-allylic rearrangement of the homoallylic substrate isopentenyl (IPP) to its allylic isomer, dimethylallyl diphosphate (DMAPP) (By similarity).
| + | [https://www.uniprot.org/uniprot/IDI2_SACSH IDI2_SACSH] Involved in the biosynthesis of isoprenoids. Catalyzes the 1,3-allylic rearrangement of the homoallylic substrate isopentenyl (IPP) to its allylic isomer, dimethylallyl diphosphate (DMAPP).[HAMAP-Rule:MF_00354]<ref>PMID:19158086</ref> <ref>PMID:22158896</ref> <ref>PMID:22505674</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Saccharolobus shibatae]] | |
| - | [[Category: Isopentenyl-diphosphate Delta-isomerase]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Hemmi, H]] | + | [[Category: Saccharolobus shibatae]] |
| - | [[Category: Nagai, T]] | + | [[Category: Hemmi H]] |
| - | [[Category: Unno, H]]
| + | [[Category: Nagai T]] |
| - | [[Category: Dmapp]] | + | [[Category: Unno H]] |
| - | [[Category: Fmn]] | + | |
| - | [[Category: Idi]]
| + | |
| - | [[Category: Isomerase]]
| + | |
| - | [[Category: Isopentenyl diphosphate isomerase]]
| + | |
| - | [[Category: Type 2]]
| + | |
| Structural highlights
Function
IDI2_SACSH Involved in the biosynthesis of isoprenoids. Catalyzes the 1,3-allylic rearrangement of the homoallylic substrate isopentenyl (IPP) to its allylic isomer, dimethylallyl diphosphate (DMAPP).[HAMAP-Rule:MF_00354][1] [2] [3]
Publication Abstract from PubMed
Evidence for an unusual catalysis of protonation/deprotonation by a reduced flavin mononucleotide cofactor is presented for type-2 isopentenyl diphosphate isomerase (IDI-2), which catalyzes isomerization of the two fundamental building blocks of isoprenoid biosynthesis, isopentenyl diphosphate and dimethylallyl diphosphate. The covalent adducts formed between irreversible mechanism-based inhibitors, 3-methylene-4-penten-1-yl diphosphate or 3-oxiranyl-3-buten-1-yl diphosphate, and the flavin cofactor were investigated by X-ray crystallography and UV-visible spectroscopy. Both the crystal structures of IDI-2 binding the flavin-inhibitor adduct and the UV-visible spectra of the adducts indicate that the covalent bond is formed at C4a of flavin rather than at N5, which had been proposed previously. In addition, the high-resolution crystal structures of IDI-2-substrate complexes and the kinetic studies of new mutants confirmed that only the flavin cofactor can catalyze protonation of the substrates and suggest that N5 of flavin is most likely to be involved in proton transfer. These data provide support for a mechanism where the reduced flavin cofactor acts as a general acid/base catalyst and helps stabilize the carbocationic intermediate formed by protonation.
Covalent modification of reduced flavin mononucleotide in type-2 isopentenyl diphosphate isomerase by active-site-directed inhibitors.,Nagai T, Unno H, Janczak MW, Yoshimura T, Poulter CD, Hemmi H Proc Natl Acad Sci U S A. 2011 Dec 20;108(51):20461-6. Epub 2011 Dec 7. PMID:22158896[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Unno H, Yamashita S, Ikeda Y, Sekiguchi SY, Yoshida N, Yoshimura T, Kusunoki M, Nakayama T, Nishino T, Hemmi H. New role of flavin as a general acid-base catalyst with no redox function in type 2 isopentenyl-diphosphate isomerase. J Biol Chem. 2009 Apr 3;284(14):9160-7. Epub 2009 Jan 21. PMID:19158086 doi:10.1074/jbc.M808438200
- ↑ Nagai T, Unno H, Janczak MW, Yoshimura T, Poulter CD, Hemmi H. Covalent modification of reduced flavin mononucleotide in type-2 isopentenyl diphosphate isomerase by active-site-directed inhibitors. Proc Natl Acad Sci U S A. 2011 Dec 20;108(51):20461-6. Epub 2011 Dec 7. PMID:22158896 doi:10.1073/pnas.1115749108
- ↑ Nakatani H, Goda S, Unno H, Nagai T, Yoshimura T, Hemmi H. Substrate-Induced Change in the Quaternary Structure of Type 2 Isopentenyl Diphosphate Isomerase from Sulfolobus shibatae. J Bacteriol. 2012 Jun;194(12):3216-24. Epub 2012 Apr 13. PMID:22505674 doi:10.1128/JB.00068-12
- ↑ Nagai T, Unno H, Janczak MW, Yoshimura T, Poulter CD, Hemmi H. Covalent modification of reduced flavin mononucleotide in type-2 isopentenyl diphosphate isomerase by active-site-directed inhibitors. Proc Natl Acad Sci U S A. 2011 Dec 20;108(51):20461-6. Epub 2011 Dec 7. PMID:22158896 doi:10.1073/pnas.1115749108
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