2ia8: Difference between revisions
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==Kinetic and Crystallographic Studies of a Redesigned Manganese-Binding Site in Cytochrome c Peroxidase== | ==Kinetic and Crystallographic Studies of a Redesigned Manganese-Binding Site in Cytochrome c Peroxidase== | ||
<StructureSection load='2ia8' size='340' side='right' caption='[[2ia8]], [[Resolution|resolution]] 1.48Å' scene=''> | <StructureSection load='2ia8' size='340' side='right' caption='[[2ia8]], [[Resolution|resolution]] 1.48Å' scene=''> | ||
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CCP1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 ATCC 18824])</td></tr> | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CCP1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 ATCC 18824])</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cytochrome-c_peroxidase Cytochrome-c peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.5 1.11.1.5] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cytochrome-c_peroxidase Cytochrome-c peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.5 1.11.1.5] </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=2ia8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ia8 OCA], [http://pdbe.org/2ia8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ia8 RCSB], [http://www.ebi.ac.uk/pdbsum/2ia8 PDBsum]</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=2ia8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ia8 OCA], [http://pdbe.org/2ia8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ia8 RCSB], [http://www.ebi.ac.uk/pdbsum/2ia8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ia8 ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ia/2ia8_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ia/2ia8_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
Revision as of 11:11, 4 July 2018
Kinetic and Crystallographic Studies of a Redesigned Manganese-Binding Site in Cytochrome c PeroxidaseKinetic and Crystallographic Studies of a Redesigned Manganese-Binding Site in Cytochrome c Peroxidase
Structural highlights
Function[CCPR_YEAST] Destroys radicals which are normally produced within the cells and which are toxic to biological systems. 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 PubMedManganese peroxidase (MnP) from the white rot fungus Phanerochaete chrysosporium contains a manganese-binding site that plays a critical role in its function. Previously, a Mn(II)-binding site was designed into cytochrome c peroxidase (CcP) based on sequence homology (Yeung et al. in Chem. Biol. 4:215-222, 1997; Gengenbach et al. in Biochemistry 38:11425-11432, 1999). Here, we report a redesign of this site based on X-ray structural comparison of MnP and CcP. The variant, CcP(D37E, V45E, H181E), displays 2.5-fold higher catalytic efficiency (k (cat)/K (M)) than the variant in the original design, mostly due to a stronger K (M) of 1.9 mM (vs. 4.1 mM). High-resolution X-ray crystal structures of a metal-free form and a form with Co(II) at the designed Mn(II) site were also obtained. The metal ion in the engineered metal-binding site overlays well with Mn(II) bound in MnP, suggesting that this variant is the closest structural model of the Mn(II)-binding site in MnP for which a crystal structure exists. A major difference arises in the distances of the ligands to the metal; the metal-ligand interactions in the CcP variant are much weaker than the corresponding interactions in MnP, probably owing to partial occupancy of metal ion at the designed site, difference in the identity of metal ions (Co(II) rather than Mn(II)) and other interactions in the second coordination sphere. These results indicate that the metal ion, the ligands, and the environment around the metal-binding site play important roles in tuning the structure and function of metalloenzymes. Kinetic and crystallographic studies of a redesigned manganese-binding site in cytochrome c peroxidase.,Pfister TD, Mirarefi AY, Gengenbach AJ, Zhao X, Danstrom C, Conatser N, Gao YG, Robinson H, Zukoski CF, Wang AH, Lu Y J Biol Inorg Chem. 2007 Jan;12(1):126-37. Epub 2006 Oct 5. PMID:17021923[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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