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| | ==Crystal structure of PcyA V225D-biliverdin IX alpha complex== | | ==Crystal structure of PcyA V225D-biliverdin IX alpha complex== |
| - | <StructureSection load='3ajg' size='340' side='right' caption='[[3ajg]], [[Resolution|resolution]] 1.90Å' scene=''> | + | <StructureSection load='3ajg' size='340' side='right'caption='[[3ajg]], [[Resolution|resolution]] 1.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3ajg]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Aphanocapsa_sp._(strain_n-1) Aphanocapsa sp. (strain n-1)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AJG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3AJG FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3ajg]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechocystis_sp._PCC_6803 Synechocystis sp. PCC 6803]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AJG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3AJG FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BLA:BILIVERDINE+IX+ALPHA'>BLA</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]] 1.9Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3ajh|3ajh]]</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BLA:BILIVERDINE+IX+ALPHA'>BLA</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pcyA, slr0116 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1148 Aphanocapsa sp. (strain N-1)])</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=3ajg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ajg OCA], [https://pdbe.org/3ajg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3ajg RCSB], [https://www.ebi.ac.uk/pdbsum/3ajg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3ajg 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/Phycocyanobilin:ferredoxin_oxidoreductase Phycocyanobilin:ferredoxin oxidoreductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.3.7.5 1.3.7.5] </span></td></tr>
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| - | <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=3ajg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ajg OCA], [http://pdbe.org/3ajg PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3ajg RCSB], [http://www.ebi.ac.uk/pdbsum/3ajg PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3ajg ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/PCYA_SYNY3 PCYA_SYNY3]] Catalyzes the four-electron reduction of biliverdin IX-alpha (2-electron reduction at both the A and D rings); the reaction proceeds via an isolatable 2-electron intermediate, 181,182-dihydrobiliverdin (By similarity). | + | [https://www.uniprot.org/uniprot/PCYA_SYNY3 PCYA_SYNY3] Catalyzes the four-electron reduction of biliverdin IX-alpha (2-electron reduction at both the A and D rings); the reaction proceeds via an isolatable 2-electron intermediate, 181,182-dihydrobiliverdin (By similarity). |
| | <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: Phycocyanobilin:ferredoxin oxidoreductase]] | + | [[Category: Large Structures]] |
| - | [[Category: Fukuyama, K]] | + | [[Category: Synechocystis sp. PCC 6803]] |
| - | [[Category: Hagiwara, Y]] | + | [[Category: Fukuyama K]] |
| - | [[Category: Wada, K]]
| + | [[Category: Hagiwara Y]] |
| - | [[Category: Alpha/beta/alpha sandwich]] | + | [[Category: Wada K]] |
| - | [[Category: Oxidoreductase]] | + | |
| Structural highlights
Function
PCYA_SYNY3 Catalyzes the four-electron reduction of biliverdin IX-alpha (2-electron reduction at both the A and D rings); the reaction proceeds via an isolatable 2-electron intermediate, 181,182-dihydrobiliverdin (By similarity).
Publication Abstract from PubMed
Phycocyanobilin:ferredoxin oxidoreductase (PcyA) catalyzes the sequential reduction of the vinyl group of the D-ring and A-ring of biliverdin IXalpha (BV), using reducing equivalents provided by ferredoxin. This reaction produces phycocyanobilin, a pigment used for light-harvesting and light-sensing in red algae and cyanobacteria. The crystal structure of PcyA-BV reveals that BV is specifically bound in the PcyA active pocket through extensive hydrophobic and hydrophilic interactions. During the course of a mutational study of PcyA, we observed that mutation of the V225 position, apart from the processing sites, conferred an unusual property on PcyA; V225D mutant protein could bind BV and its analog BV13, but these complexes showed a distinct UV-vis absorption spectrum from that of the wild-type PcyA-BV complex. The crystal structures of BV- and BV13-bound forms of V225D protein revealed that gross structural changes occurred near the substrate-binding pocket, and that the BV/BV13 binding manner in the pocket was dramatically altered. Protein folding in V225D-BV/BV13 was more similar to that of substrate-free PcyA than that in PcyA-BV; the "induced-fit" did not occur when BV/BV13 was bound to the V225D protein. The unexpected structural change presented here provides a cautionary note about interpreting functional data derived from a mutated protein in the absence of its exact structure.
One residue substitution in PcyA leads to unexpected changes in tetrapyrrole substrate binding.,Wada K, Hagiwara Y, Yutani Y, Fukuyama K Biochem Biophys Res Commun. 2010 Nov 12;402(2):373-7. Epub 2010 Oct 12. PMID:20946883[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Wada K, Hagiwara Y, Yutani Y, Fukuyama K. One residue substitution in PcyA leads to unexpected changes in tetrapyrrole substrate binding. Biochem Biophys Res Commun. 2010 Nov 12;402(2):373-7. Epub 2010 Oct 12. PMID:20946883 doi:10.1016/j.bbrc.2010.10.037
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