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| | <StructureSection load='1qgo' size='340' side='right'caption='[[1qgo]], [[Resolution|resolution]] 2.40Å' scene=''> | | <StructureSection load='1qgo' size='340' side='right'caption='[[1qgo]], [[Resolution|resolution]] 2.40Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1qgo]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Salty Salty]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QGO OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1QGO FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1qgo]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_Typhimurium_str._LT2 Salmonella enterica subsp. enterica serovar Typhimurium str. LT2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QGO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QGO FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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]] 2.4Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CBIK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=99287 SALTY])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=1qgo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qgo OCA], [http://pdbe.org/1qgo PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1qgo RCSB], [http://www.ebi.ac.uk/pdbsum/1qgo PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1qgo 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=1qgo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qgo OCA], [https://pdbe.org/1qgo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qgo RCSB], [https://www.ebi.ac.uk/pdbsum/1qgo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qgo ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CBIK_SALTY CBIK_SALTY]] Catalyzes the insertion of Co(2+) into sirohydrochlorin as part of the anaerobic pathway to cobalamin biosynthesis. | + | [https://www.uniprot.org/uniprot/CBIK_SALTY CBIK_SALTY] Catalyzes the insertion of Co(2+) into sirohydrochlorin as part of the anaerobic pathway to cobalamin biosynthesis. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Salty]] | + | [[Category: Salmonella enterica subsp. enterica serovar Typhimurium str. LT2]] |
| - | [[Category: Raux, E]] | + | [[Category: Raux E]] |
| - | [[Category: Schubert, H L]] | + | [[Category: Schubert HL]] |
| - | [[Category: Warren, M J]] | + | [[Category: Warren MJ]] |
| - | [[Category: Wilson, K S]] | + | [[Category: Wilson KS]] |
| - | [[Category: Cbik]]
| + | |
| - | [[Category: Chelatase]]
| + | |
| - | [[Category: Cobalamin]]
| + | |
| - | [[Category: Cobalt precorrin]]
| + | |
| - | [[Category: Metal binding protein]]
| + | |
| - | [[Category: Metal ion chelation]]
| + | |
| - | [[Category: Vitamin b12]]
| + | |
| Structural highlights
Function
CBIK_SALTY Catalyzes the insertion of Co(2+) into sirohydrochlorin as part of the anaerobic pathway to cobalamin biosynthesis.
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
Prosthetic groups such as heme, chlorophyll, and cobalamin (vitamin B(12)) are characterized by their branched biosynthetic pathway and unique metal insertion steps. The metal ion chelatases can be broadly classed either as single-subunit ATP-independent enzymes, such as the anaerobic cobalt chelatase and the protoporphyrin IX (PPIX) ferrochelatase, or as heterotrimeric, ATP-dependent enzymes, such as the Mg chelatase involved in chlorophyll biosynthesis. The X-ray structure of the anaerobic cobalt chelatase from Salmonella typhimurium, CbiK, has been solved to 2.4 A resolution. Despite a lack of significant amino acid sequence similarity, the protein structure is homologous to that of Bacillus subtilis PPIX ferrochelatase. Both enzymes contain a histidine residue previously identified as the metal ion ligand, but CbiK contains a second histidine in place of the glutamic acid residue identified as a general base in PPIX ferrochelatase. Site-directed mutagenesis has confirmed a role for this histidine and a nearby glutamic acid in cobalt binding, modulating metal ion specificity as well as catalytic efficiency. Contrary to the predicted protoporphyrin binding site in PPIX ferrochelatase, the precorrin-2 binding site in CbiK is clearly defined within a large horizontal cleft between the N- and C-terminal domains. The structural similarity has implications for the understanding of the evolution of this branched biosynthetic pathway.
Common chelatase design in the branched tetrapyrrole pathways of heme and anaerobic cobalamin synthesis.,Schubert HL, Raux E, Wilson KS, Warren MJ Biochemistry. 1999 Aug 17;38(33):10660-9. PMID:10451360[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Schubert HL, Raux E, Wilson KS, Warren MJ. Common chelatase design in the branched tetrapyrrole pathways of heme and anaerobic cobalamin synthesis. Biochemistry. 1999 Aug 17;38(33):10660-9. PMID:10451360 doi:10.1021/bi9906773
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