View source for 3zox


==Crystal Structure of N64Del Mutant of Nitrosomonas europaea Cytochrome c552 (monoclinic space group)==
<StructureSection load='3zox' size='340' side='right'caption='[[3zox]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3zox]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Nitrosomonas_europaea Nitrosomonas europaea]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ZOX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ZOX FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEC:HEME+C'>HEC</scene></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=3zox FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3zox OCA], [https://pdbe.org/3zox PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3zox RCSB], [https://www.ebi.ac.uk/pdbsum/3zox PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3zox ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CY552_NITEU CY552_NITEU] Monoheme c-type cytochrome. Probable electron donor to membrane cytochrome oxidase and to periplasmic nitrite reductase.
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== Publication Abstract from PubMed ==
Nitrosomonas europaea cytochrome c-552 (Ne c-552) variants with the same His/Met axial ligand set but with different EPR spectra have been characterized structurally, to aid understanding of how molecular structure determines heme electronic structure. Visible light absorption, Raman, and resonance Raman spectroscopy of the protein crystals was performed along with structure determination. The structures solved are those of Ne c-552, which displays a "HALS" (or highly anisotropic low-spin) EPR spectrum, and of the deletion mutant Ne N64Delta, which has a rhombic EPR spectrum. Two X-ray crystal structures of wild-type Ne c-552 are reported; one is of the protein isolated from N. europaea cells (Ne c-552n, 2.35 A resolution), and the other is of recombinant protein expressed in Escherichia coli (Ne c-552r, 1.63 A resolution). Ne N64Delta crystallized in two different space groups, and two structures are reported [monoclinic (2.1 A resolution) and hexagonal (2.3 A resolution)]. Comparison of the structures of the wild-type and mutant proteins reveals that heme ruffling is increased in the mutant; increased ruffling is predicted to yield a more rhombic EPR spectrum. The 2.35 A Ne c-552n structure shows 18 molecules in the asymmetric unit; analysis of the structure is consistent with population of more than one axial Met configuration, as seen previously by NMR. Finally, the mutation was shown to yield a more hydrophobic heme pocket and to expel water molecules from near the axial Met. These structures reveal that heme pocket residue 64 plays multiple roles in regulating the axial ligand orientation and the interaction of water with the heme. These results support the hypothesis that more ruffled hemes lead to more rhombic EPR signals in cytochromes c with His/Met axial ligation.

Structural Characterization of Nitrosomonas europaea Cytochrome c-552 Variants with Marked Differences in Electronic Structure.,Can M, Krucinska J, Zoppellaro G, Andersen NH, Wedekind JE, Hersleth HP, Andersson KK, Bren KL Chembiochem. 2013 Jul 31. doi: 10.1002/cbic.201300118. PMID:23908017<ref>PMID:23908017</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Nitrosomonas europaea]]
[[Category: Andersen NH]]
[[Category: Andersson KK]]
[[Category: Bren KL]]
[[Category: Can M]]
[[Category: Hersleth H-P]]
[[Category: Krucinska J]]
[[Category: Wedekind JE]]
[[Category: Zoppellaro G]]