Abstract
A tungsten-containing aldehyde:ferredoxin oxidoreductase (AOR) has been purified to homogeneity from Pyrobaculum aerophilum. The N-terminal sequence of the isolated enzyme matches a single open reading frame in the genome. Metal analysis and electron paramagnetic resonance (EPR) spectroscopy indicate that the P. aerophilum AOR contains one tungsten center and one [4Fe-4S]2+/1+ cluster per 68-kDa monomer. Native AOR is a homodimer. EPR spectroscopy of the purified enzyme that has been reduced with the substrate crotonaldehyde revealed a W(V) species with g zyx values of 1.952, 1.918, 1.872. The substrate-reduced AOR also contains a [4Fe-4S]1+ cluster with S=3/2 and zero field splitting parameters D=7.5 cm−1 and E/D=0.22. Molybdenum was absent from the enzyme preparation. The P. aerophilum AOR lacks the amino acid sequence motif indicative for binding of mononuclear iron that is typically found in other AORs. Furthermore, the P. aerophilum AOR utilizes a 7Fe ferredoxin as the putative physiological redox partner, instead of a 4Fe ferredoxin as in Pyrococcus furiosus. This 7Fe ferredoxin has been purified from P. aerophilum, and the amino acid sequence has been identified using mass spectrometry. Direct electrochemistry of the ferredoxin showed two one-electron transitions, at −306 and −445 mV. In the presence of 55 μM ferredoxin the AOR activity is 17% of the activity obtained with 1 mM benzyl viologen as an electron acceptor.
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Abbreviations
- AOR:
-
Aldehyde:ferredoxin oxidoreductase
- DEAE:
-
(Diethylamino)ethyl
- EPPS:
-
N-(2-Hydroxyethyl)piperazine-N′-propanesulfonic acid
- EPR:
-
Electron paramagnetic resonance
- FOR:
-
Formaldehyde:ferredoxin oxidoreductase
- GAPOR:
-
Glyceraldehyde-3-phosphate:ferredoxin oxidoreductase
- LC:
-
Liquid chromatography
- MS:
-
Mass spectrometry
- ORF:
-
Open reading frame
- PVDF:
-
Poly(vinylidene difluoride)
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- Tris:
-
Tris(hydroxymethyl)aminomethane
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Hagedoorn, P.L., Chen, T., Schröder, I. et al. Purification and characterization of the tungsten enzyme aldehyde:ferredoxin oxidoreductase from the hyperthermophilic denitrifier Pyrobaculum aerophilum. J Biol Inorg Chem 10, 259–269 (2005). https://doi.org/10.1007/s00775-005-0637-5
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DOI: https://doi.org/10.1007/s00775-005-0637-5