View source for 3orv


==Crystal Structure of the Y294H-MauG/pre-Methylamine Dehydrogenase Complex==
<StructureSection load='3orv' size='340' side='right'caption='[[3orv]], [[Resolution|resolution]] 1.91&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3orv]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Paracoccus_denitrificans_PD1222 Paracoccus denitrificans PD1222]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ORV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ORV 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]] 1.91&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0AF:7-HYDROXY-L-TRYPTOPHAN'>0AF</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=P6G:HEXAETHYLENE+GLYCOL'>P6G</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</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=3orv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3orv OCA], [https://pdbe.org/3orv PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3orv RCSB], [https://www.ebi.ac.uk/pdbsum/3orv PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3orv ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MAUG_PARDP MAUG_PARDP] Involved in methylamine metabolism. Essential for the maturation of the beta subunit of MADH, presumably via a step in the biosynthesis of tryptophan tryptophylquinone (TTQ), the cofactor of MADH.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The diheme enzyme MauG catalyzes the posttranslational modification of a precursor protein of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofactor. It catalyzes three sequential two-electron oxidation reactions which proceed through a high-valent bis-Fe(IV) redox state. Tyr294, the unusual distal axial ligand of one c-type heme, was mutated to His, and the crystal structure of Y294H MauG in complex with preMADH reveals that this heme now has His-His axial ligation. Y294H MauG is able to interact with preMADH and participate in interprotein electron transfer, but it is unable to catalyze the TTQ biosynthesis reactions that require the bis-Fe(IV) state. This mutation affects not only the redox properties of the six-coordinate heme but also the redox and CO-binding properties of the five-coordinate heme, despite the 21 A separation of the heme iron centers. This highlights the communication between the hemes which in wild-type MauG behave as a single diheme unit. Spectroscopic data suggest that Y294H MauG can stabilize a high-valent redox state equivalent to Fe(V), but it appears to be an Fe(IV) horizontal lineO/pi radical at the five-coordinate heme rather than the bis-Fe(IV) state. This compound I-like intermediate does not catalyze TTQ biosynthesis, demonstrating that the bis-Fe(IV) state, which is stabilized by Tyr294, is specifically required for this reaction. The TTQ biosynthetic reactions catalyzed by wild-type MauG do not occur via direct contact with the Fe(IV) horizontal lineO heme but via long-range electron transfer through the six-coordinate heme. Thus, a critical feature of the bis-Fe(IV) species may be that it shortens the electron transfer distance from preMADH to a high-valent heme iron.

Functional Importance of Tyrosine 294 and the Catalytic Selectivity for the Bis-Fe(IV) State of MauG Revealed by Replacement of This Axial Heme Ligand with Histidine .,Abu Tarboush N, Jensen LM, Feng M, Tachikawa H, Wilmot CM, Davidson VL Biochemistry. 2010 Nov 16;49(45):9783-91. Epub 2010 Oct 20. PMID:20929212<ref>PMID:20929212</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3orv" style="background-color:#fffaf0;"></div>

==See Also==
*[[Methylamine dehydrogenase|Methylamine dehydrogenase]]
*[[Methylamine utilisation protein|Methylamine utilisation protein]]
*[[Methylation utilization protein MauG|Methylation utilization protein MauG]]
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Paracoccus denitrificans PD1222]]
[[Category: Jensen LMR]]
[[Category: Wilmot CM]]