The primary structure of the split-Soret cytochrome c from Desulfovibrio desulfuricans ATCC 27774 reveals an unusual type of diheme cytochrome c,
Devreese, B., Costa C., Demol H., Papaefthymiou V., Moura I., Moura J. J., and Van Beeumen J.
, Eur J Biochem, Sep 1, Volume 248, Number 2, p.445-51, (1997)
AbstractThe complete amino acid sequence of the unusual diheme split-Soret cytochrome c from the sulphate-reducing Desulfovibrio desulfuricans strain ATCC 27774 has been determined using classical chemical sequencing techniques and mass spectrometry. The 247-residue sequence shows almost no similarity with any other known diheme cytochrome c, but the heme-binding site of the protein is similar to that of the cytochromes c3 from the sulphate reducers. The cytochrome-c-like domain of the protein covers only the C-terminal part of the molecule, and there is evidence for at least one more domain containing four cysteine residues, which might bind another cofactor, possibly a non-heme iron-containing cluster. This domain is similar to a sequence fragment of the genome of Archaeoglobus fulgidus, which confirms the high conservation of the genes involved in sulfate reduction.
Protein-Assisted Formation of Molybdenum Heterometallic Clusters: Evidence for the Formation of S2MoS2−M−S2MoS2 Clusters with M = Fe, Co, Ni, Cu, or Cd within the Orange Protein,
Maiti, B. K., Maia L. B., Pauleta S. R., Moura I., and Moura J. J. G.
, Inorg Chem, Volume 56, p.2210−2220, (2017)
Proteins containing the factor F430 from methanosarcina barkeri and methanobacterium thermoautotrophicum: Isolation and properties,
Moura, Isabel, Moura José J. G., Santos Helena, Xavier Antonio V., Burch Gary, Peck Jr Harry D., and Legall Jean
, Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, Volume 742, Number 1, p.84-90, (1983)
Abstractn/a
Protonation state of the Cu4S2 CuZ site in nitrous oxide reductase: redox dependence and insight into reactivity,
Johnston, E. M., Dell'Acqua S., Pauleta S. R., Moura I., and Solomon E. I.
, Chem Sci, Volume 6, p.5670-5679, (2015)
Purification and characterization of a tungsten-containing formate dehydrogenase from Desulfovibrio gigas,
Almendra, M. J., Brondino C. D., Gavel O., Pereira A. S., Tavares P., Bursakov S., Duarte R., Caldeira J., Moura J. J., and Moura I.
, Biochemistry, Dec 7, Volume 38, Number 49, p.16366-72, (1999)
AbstractAn air-stable formate dehydrogenase (FDH), an enzyme that catalyzes the oxidation of formate to carbon dioxide, was purified from the sulfate reducing organism Desulfovibrio gigas (D. gigas) NCIB 9332. D. gigas FDH is a heterodimeric protein [alpha (92 kDa) and beta (29 kDa) subunits] and contains 7 +/- 1 Fe/protein and 0.9 +/- 0.1 W/protein. Selenium was not detected. The UV/visible absorption spectrum of D. gigas FDH is typical of an iron-sulfur protein. Analysis of pterin nucleotides yielded a content of 1.3 +/- 0.1 guanine monophosphate/mol of enzyme, which suggests a tungsten coordination with two molybdopterin guanine dinucleotide cofactors. Both Mossbauer spectroscopy performed on D. gigas FDH grown in a medium enriched with (57)Fe and EPR studies performed in the native and fully reduced state of the protein confirmed the presence of two [4Fe-4S] clusters. Variable-temperature EPR studies showed the presence of two signals compatible with an atom in a d(1) configuration albeit with an unusual relaxation behavior as compared to the one generally observed for W(V) ions.
Purification, characterization and redox properties of hydrogenase from Methanosarcina barkeri (DSM 800),
Fauque, G., Teixeira M., Moura I., Lespinat P. A., Xavier A. V., Dervartanian D. V., Peck, H. D. Jr., Legall J., and Moura J. G.
, Eur J Biochem, Jul 2, Volume 142, Number 1, p.21-8, (1984)
AbstractA soluble hydrogenase from the methanogenic bacterium, Methanosarcina barkeri (DSM 800) has been purified to apparent electrophoretic homogeneity, with an overall 550-fold purification, a 45% yield and a final specific activity of 270 mumol H2 evolved min-1 (mg protein)-1. The hydrogenase has a high molecular mass of approximately equal to 800 kDa and subunits with molecular masses of approximately equal to 60 kDa. The enzyme is stable to heating at 65 degrees C and to exposure to air at 4 degrees C in the oxidized state for periods up to a week. The overall stability of this enzyme is compared with other hydrogenase isolated from strict anaerobic sulfate-reducing bacteria. Ms. barkeri hydrogenase shows an absorption spectrum typical of a non-heme iron protein with maxima at 275 nm, 380 nm and 405 nm. A flavin component, identified as FMN or riboflavin was extracted under acidic conditions and quantified to approximately one flavin molecule per subunit. In addition to this component, 8-10 iron atoms and 0.6-0.8 nickel atom were also detected per subunit. The electron paramagnetic resonance (EPR) spectrum of the native enzyme shows a rhombic signal with g values at 2.24, 2.20 and approximately equal to 2.0. probably due to nickel which is optimally measured at 40 K but still detectable at 77 K. In the reduced state, using dithionite or molecular hydrogen as reductants, at least two types of g = 1.94 EPR signals, due to iron-sulfur centers, could be detected and differentiated on the basis of power and temperature dependence. Center I has g values at 2.04, 1.90 and 1.86, while center II has g values at 2.08, 1.93 and 1.85. When the hydrogenase is reduced by hydrogen or dithionite the rhombic EPR species disappears and is replaced by other EPR-active species with g values at 2.33, 2.23, 2.12, 2.09, 2.04 and 2.00. These complex signals may represent different nickel species and are only observable at temperatures higher than 20 K. In the native preparation, at high temperatures (T greater than 35 K) or in partially reduced samples, a free radical due to the flavin moiety is observed. The EPR spectrum of reduced hydrogenase in 80% Me2SO presents an axial type of spectrum only detectable below 30 K.
Purification, characterization, and preliminary crystallographic study of copper-containing nitrous oxide reductase from Pseudomonas nautica 617,
Prudencio, M., Pereira A. S., Tavares P., Besson S., Cabrito I., Brown K., Samyn B., Devreese B., Van Beeumen J., Rusnak F., Fauque G., Moura J. J., Tegoni M., Cambillau C., and Moura I.
, Biochemistry, Apr 11, Volume 39, Number 14, p.3899-907, (2000)
AbstractThe aerobic purification of Pseudomonas nautica 617 nitrous oxide reductase yielded two forms of the enzyme exhibiting different chromatographic behaviors. The protein contains six copper atoms per monomer, arranged in two centers named Cu(A) and Cu(Z). Cu(Z) could be neither oxidized nor further reduced under our experimental conditions, and exhibits a 4-line EPR spectrum (g(x)=2.015, A(x)=1.5 mT, g(y)=2.071, A(y)=2 mT, g(z)=2.138, A(z)=7 mT) and a strong absorption at approximately 640 nm. Cu(A) can be stabilized in a reduced EPR-silent state and in an oxidized state with a typical 7-line EPR spectrum (g(x)=g(y)= 2.021, A(x) = A(y)=0 mT, g(z) = 2.178, A(z)= 4 mT) and absorption bands at 480, 540, and approximately 800 nm. The difference between the two purified forms of nitrous oxide reductase is interpreted as a difference in the oxidation state of the Cu(A) center. In form A, Cu(A) is predominantly oxidized (S = (1)/(2), Cu(1.5+)-Cu(1.5+)), while in form B it is mostly in the one-electron reduced state (S = 0, Cu(1+)-Cu(1+)). In both forms, Cu(Z) remains reduced (S = 1/2). Complete crystallographic data at 2.4 A indicate that Cu(A) is a binuclear site (similar to the site found in cytochrome c oxidase) and Cu(Z) is a novel tetracopper cluster [Brown, K., et al. (2000) Nat. Struct. Biol. (in press)]. The complete amino acid sequence of the enzyme was determined and comparisons made with sequences of other nitrous oxide reductases, emphasizing the coordination of the centers. A 10.3 kDa peptide copurified with both forms of nitrous oxide reductase shows strong homology with proteins of the heat-shock GroES chaperonin family.