|
|
| Line 3: |
Line 3: |
| | <StructureSection load='1xn1' size='340' side='right'caption='[[1xn1]], [[Resolution|resolution]] 3.05Å' scene=''> | | <StructureSection load='1xn1' size='340' side='right'caption='[[1xn1]], [[Resolution|resolution]] 3.05Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1xn1]] is a 10 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_of_abortion"_bang_1897 "bacillus of abortion" bang 1897]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XN1 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1XN1 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1xn1]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Brucella_abortus Brucella abortus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XN1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XN1 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 3.05Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1di0|1di0]], [[1t13|1t13]]</div></td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ribH ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=235 "Bacillus of abortion" Bang 1897])</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=1xn1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xn1 OCA], [https://pdbe.org/1xn1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xn1 RCSB], [https://www.ebi.ac.uk/pdbsum/1xn1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xn1 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/6,7-dimethyl-8-ribityllumazine_synthase 6,7-dimethyl-8-ribityllumazine synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.78 2.5.1.78] </span></td></tr> | + | |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1xn1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xn1 OCA], [http://pdbe.org/1xn1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1xn1 RCSB], [http://www.ebi.ac.uk/pdbsum/1xn1 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1xn1 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/RISB2_BRUAB RISB2_BRUAB]] Catalyzes the formation of 6,7-dimethyl-8-ribityllumazine by condensation of 5-amino-6-(D-ribitylamino)uracil with 3,4-dihydroxy-2-butanone 4-phosphate. This is the penultimate step in the biosynthesis of riboflavin. Displays low catalytic activity in comparison with the isozyme RibH1.<ref>PMID:10482294</ref> <ref>PMID:16165152</ref> | + | [https://www.uniprot.org/uniprot/RISB2_BRUAB RISB2_BRUAB] Catalyzes the formation of 6,7-dimethyl-8-ribityllumazine by condensation of 5-amino-6-(D-ribitylamino)uracil with 3,4-dihydroxy-2-butanone 4-phosphate. This is the penultimate step in the biosynthesis of riboflavin. Displays low catalytic activity in comparison with the isozyme RibH1.<ref>PMID:10482294</ref> <ref>PMID:16165152</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| Line 35: |
Line 33: |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bacillus of abortion bang 1897]] | + | [[Category: Brucella abortus]] |
| - | [[Category: 6,7-dimethyl-8-ribityllumazine synthase]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Braden, B C]] | + | [[Category: Braden BC]] |
| - | [[Category: Goldbaum, F A]] | + | [[Category: Goldbaum FA]] |
| - | [[Category: Guimaraes, B G]] | + | [[Category: Guimaraes BG]] |
| - | [[Category: Klinke, S]] | + | [[Category: Klinke S]] |
| - | [[Category: Vega, D R]] | + | [[Category: Vega DR]] |
| - | [[Category: Zylberman, V]] | + | [[Category: Zylberman V]] |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
RISB2_BRUAB Catalyzes the formation of 6,7-dimethyl-8-ribityllumazine by condensation of 5-amino-6-(D-ribitylamino)uracil with 3,4-dihydroxy-2-butanone 4-phosphate. This is the penultimate step in the biosynthesis of riboflavin. Displays low catalytic activity in comparison with the isozyme RibH1.[1] [2]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The enzyme lumazine synthase (LS) catalyzes the penultimate step of riboflavin biosynthesis in plants, fungi and bacteria. The quaternary structure of the polypeptide differs between species, existing as pentamers or as icosahedrally arranged dodecamers of pentamers with 60 subunits. The pathogen Brucella spp. expresses two proteins that exhibit LS activity, RibH1 and RibH2. The latter enzyme belongs to a novel third category of quaternary arrangement for LS, that of a decameric structure assembled as a head-to-head oriented dimer of pentamers. In contrast, the RibH1 enzyme is assembled as a pentamer, as noted for several other LS enzymes. RibH1 appears to be the functional LS in Brucella spp., whereas RibH2, an enzyme of lower catalytic activity, is a virulence factor presumably acting in response to oxidative stress. The latter observation prompted us to further investigate the structural and catalytic properties of RibH2 in order to clarify the biological function of this enzyme. Here, we present a detailed analysis of two new crystallographic forms of RibH2 that explain the low catalytic activity of this enzyme in comparison with RibH1 and other LSs. Additionally, we analyze the effect of pH on the structure of this enzyme, and the binding of riboflavin and 6,7-dimethyl-8-ribityllumazine to its active site.
Crystallographic studies on decameric Brucella spp. Lumazine synthase: a novel quaternary arrangement evolved for a new function?,Klinke S, Zylberman V, Vega DR, Guimaraes BG, Braden BC, Goldbaum FA J Mol Biol. 2005 Oct 14;353(1):124-37. PMID:16165152[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Goldbaum FA, Velikovsky CA, Baldi PC, Mortl S, Bacher A, Fossati CA. The 18-kDa cytoplasmic protein of Brucella species --an antigen useful for diagnosis--is a lumazine synthase. J Med Microbiol. 1999 Sep;48(9):833-9. PMID:10482294
- ↑ Klinke S, Zylberman V, Vega DR, Guimaraes BG, Braden BC, Goldbaum FA. Crystallographic studies on decameric Brucella spp. Lumazine synthase: a novel quaternary arrangement evolved for a new function? J Mol Biol. 2005 Oct 14;353(1):124-37. PMID:16165152 doi:http://dx.doi.org/10.1016/j.jmb.2005.08.017
- ↑ Klinke S, Zylberman V, Vega DR, Guimaraes BG, Braden BC, Goldbaum FA. Crystallographic studies on decameric Brucella spp. Lumazine synthase: a novel quaternary arrangement evolved for a new function? J Mol Biol. 2005 Oct 14;353(1):124-37. PMID:16165152 doi:http://dx.doi.org/10.1016/j.jmb.2005.08.017
|
