1.2.5.3: aerobic carbon monoxide dehydrogenase
This is an abbreviated version!
For detailed information about aerobic carbon monoxide dehydrogenase, go to the full flat file.
Word Map on EC 1.2.5.3
Reaction
Synonyms
aerobic Mo/Cu-containing CO dehydrogenase, Carbon monoxide dehydrogenase, CO dehydrogenase, CODH, CoxS, coxSML, CutL, CutM, CutS, EC 1.2.2.4, EC 1.2.3.10, Mo-CODH, Mo-Cu carbon monoxide dehydrogenase, Mo/Cu CODH, MoCu-CODH, molybdenum- and copper-containing carbon monoxide dehydrogenase, molybdenum- and copper-dependent CO dehydrogenase, molybdenum-containing carbon monoxide dehydrogenase, molybdenum-containing CO dehydrogenase, molybdenum-copper carbon monoxide dehydrogenase, molybdenum-copper CO dehydrogenase, molybdenum/copper-containing carbon monoxide dehydrogenase, molybdoenzyme carbon monoxide dehydrogenase
ECTree
1.2.5.3 aerobic carbon monoxide dehydrogenaseAdvanced search results
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Cofactor on EC 1.2.5.3 - aerobic carbon monoxide dehydrogenase
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COFACTOR 
ORGANISM
UNIPROT
COMMENTARY 
LITERATURE
IMAGE
molybdenum-containing cofactor
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the active site molybdenum center located in teh large subunit. The molybdenum becomes reduced in the final step of the reaction
seleno-molybdenum-cofactor
analysis of the architecture and arrangements of the molybdopterin-cytosine dinucleotide-type of the molybdenum cofactor. The hydrogen bonding interaction pattern of the molybdenum cofactor involves 27 hydrogen bonds with the surrounding protein. Of these, eight are with the cytosine moiety, eight with the diphosphate, six with the pyranopterin, and five with the ligands of the Mo. A 5'-CDP residue is present in Mominus CODH, whereas the Mo-pyranopterin moiety is absent. Different side-chain conformations of the active site residues S-selanyl-Cys385 and Glu757 in Moplus and Mominus CODH indicate a side-chain flexibility and a function of the Mo ion in the proper orientation of both residues. Function of the Mo ion in the proper orientation of active-site residues S-selanyl-Cys385 and Glu757. Mo is an absolute requirement for the conversion of molybdopterin to MCD, a tricyclic tetra-hydropterin-pyran system reduced by two electrons when compared to the fully oxidized state, as well as for insertion of the Mo cofactor into CODH
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[2Fe-2S]-center
presence of 2 [Fe2S2] clusters, UV-vis spectrum shows a shoulder at 550 nm
[CuSMoO2] cluster
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CO oxidation by CO dehydrogenase proceeds at a unique [Mo+VIO2-S-Cu+I-S-Cys] cluster which matures posttranslationally while integrated into the completely folded apoenzyme. The Mo ion of the cluster is coordinated by the ene-dithiolate of the molybdopterin cytosine dinucleotide cofactor (MCD). The cofactor biosynthesis starts with the MgATP-dependent, reductive sulfuration of [MoVIO3] to [MoVO2SH] which entails the AAA+-ATPase chaperone CoxD. Then MoV is reoxidized and Cu1+-ion is integrated. Copper is supplied by the soluble CoxF protein which forms a complex with the membrane-bound von Willebrand protein CoxE through RGD-integrin interactions and enables the reduction of CoxF-bound Cu2+, employing electrons from respiration. Copper appears as Cu2+-phytate, is mobilized through the phytase activity of CoxF and then transferred to the CoxF putative copperbinding site. The coxG gene does not participate in the maturation of the bimetallic cluster
FAD
FAD is bound in a fold formed by the N-terminal and middle domains. In the N-terminal domain a beta-turn part of a betaalphabeta-unit of a three-stranded parallel beta-sheet contains the motif 32AGGHS36 which interacts with the FAD diphosphate. FAD binding structure, overview
FAD
FAD is bound in the medium subunit, a flavoprotein
FAD
FAD is bound in the medium subunit. The flavoprotein can be removed from CO dehydrogenase by dissociation with sodium dodecylsulfate, the resulting M(LS)2- or (LS)2-structured CO dehydrogenase species can be reconstituted with the recombinant apoflavoprotein produced in Escherichia coli, structural and functional analysis of FAD binding in CO dehydrogenase
FAD
one noncovalently bound FAD molecule per monomer, FAD-binding occurs on the M subunit and requires conformational changes of subunit M introduced through the binding of subunt M to subunits LS. In air-oxidized CO dehydrogenase, the flavin is fully oxidized
FAD
the GLGTYG sequence, residues 564 to 569, in large subunit CoxL is identical to dinucleotide-binding motif GXGXXG/A, an FAD binding site. The FAD-binding domain of the ferredoxin-NADP+ reductase type is absent
molybdenum cofactor
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molybdopterin cytosine dinucleotide as the organic portion of the Bradyrhizobium japonicum CODH molybdenum cofactor
molybdenum cofactor
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presence of a square pyramidal (Mo) oxidized active site, i.e. [(MCD)MoVIOX(Fe-S)CuI(S-Cys)]n, MCD = molybdopterin cytosine dinucleotide, X = OH3 or O4, cofactor reaction mechanism, computational modelling, overview
molybdopterin cofactor
the L subunit carries the molybdenum cofactor, which is a mononuclear complex of Mo and molybdopterin-cytosine dinucleotide (MCD). The latter occurs in a redox state that is reduced by two electrons compared with the fully oxidized state, a tricyclic tetrahydropterin-pyran system. The MCD-molybdenum cofactor is buried at the center of the L subunit and is ligated through a dense network of hydrogen bonds originating from both domains of subunit L. The geometry of the first coordination sphere around the Mo ion is a distorted square pyramid
molybdopterin cofactor
the molybdoprotein of CO dehydrogenase carries the molybdopterin cytosine dinucleotide (MCD)1-type of molybdenum cofactor and the unique active-site loop Gly383-Val-Ala-Tyr-Arg-Cys-Ser-Phe-Arg391, which positions the catalytically essential S-selanylcysteine 388 in a distance of 3.7 A to the molybdenum ion
molybdopterin cofactor
the structure of the active site binuclear center of CO dehydrogenase in its oxidized form, overview. The oxidized Mo(VI) ion has the distorted square-pyramidal coordination geometry seen in other members of the xanthine oxidase family of molybdenum-containing enzymes, with an apical Mo=O and an equatorial plane consisting of a second Mo=O group rather than the catalytically labile Mo-OH seen in other family members and two sulfurs from a pyranopterin cofactor that is common to all molybdenum and tungsten enzymes. The pyranopterin cofactor is present as the dinucleotide of cytosine
quinone
quinone cofactors interact with CODH at its FAD site
additional information
a seleno-molybdo-iron-sulfur-flavoprotein
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additional information
an S-selanylcysteine-containing 88.7-kDa molybdoprotein, a 17.8-kDa iron-sulfur protein, and a 30.2-kDa flavoprotein in a (LMS)2 subunit structure
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additional information
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an S-selanylcysteine-containing 88.7-kDa molybdoprotein, a 17.8-kDa iron-sulfur protein, and a 30.2-kDa flavoprotein in a (LMS)2 subunit structure
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additional information
CODH shows carbon monoxide oxidation activity with all tested electron acceptors, including methyl viologen, NAD+, NADP+, and methylene blue. Specific activity is increased by about 20% when NAD+ and NADP+ are used as electron acceptors, compared with methyl viologen, and by about 50% when methylene blue is used
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additional information
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presence of FAD, Fe/S clusters, and a [CuSMoO2] coordination in the active site determined by Raman spectra
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additional information
rescue of 50% enzyme activity by in vitro reconstitution of the active site through the supply of sulfide first and subsequently of Cu(I) under reducing conditions. Immature forms of CO dehydrogenase isolated from the bacterium, which are deficient in S and/or Cu at the active site, are similarly activated. The [CuSMoO2] cluster is properly reconstructed. Sulfane sulfur is bound in the active site of CO dehydrogenase. Rebuilding a functional [CuSMoO2] centre by first generating a [MoO3] centre in the active site of CO dehydrogenase
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additional information
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the enzyme contains 2.29 mol of Mo, 7.96 mol of Fe, 7.60 mol of S, and 1.99 mol of flavins at a 1.15:4:3.82:1 molar ratio, but contains no tungsten
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additional information
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the enzyme is a molybdo iron-sulfur flavoprotein
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additional information
the enzyme is a molybdo iron-sulfur flavoprotein containing S-selanylcysteine. The redox components of one LMS-structured monomer are the MCD-molybdenum cofactor, composed of a molybdenum ion with two oxo- and one hydroxoligand, complexed by the enedithiolene group of MCD, [2Fe-2S] clusters of type I and type II, and a noncovalently bound FAD molecule
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