Abstract
Among the recently delineated class of non-heme iron oxo proteins is the hydroxylase component of methane monooxygenase, an enzyme that catalyzes the conversion of methane to methanol according to eq. 1.1 Methane monooxygenases (MMOs) are found in methanotrophic bacteria
that use methane as their sole source of carbon and energy.2 In this article we discuss mainly the results of studies that have been carried out on MMOs from the organisms Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b. The soluble MMOs from both of these organisms contain two proteins in addition to the hydroxylase, a reductase with associated FAD and Fe2S2 prosthetic groups and a smaller polypeptide, designated protein B, that is believed to play a role in regulating electron transfer between the reductase and hydroxylase components.3, 4 The relative roles of these proteins in the overall MMO system are displayed in Figure 1. Most catalysts that effect the hydroxylation of alkanes by dioxygen are also able to catalyze the direct oxidation (autoxidation) of the reductant with dioxygen. The MMO system avoids this potential problem by physically isolating the hydroxylase and reductase functionalities on different proteins.
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References
H. Dalton, Oxidation of hydrocarbons by methane monooxygenases from a variety of microbes, Adv. Appl. Microbiol., 26:71 (1980).
C. Anthony, “The biochemistry of methylotrophs,” Academic Press, London (1982).
J. Colby and H. Dalton, Resolution of the methane monooxygenase of Methylococcus capsulatus (Bath) into three components. Purification and properties of component C, a flavoprotein, Biochem. J., 171:461 (1978).
B. G. Fox, W. A. Froland, J. E. Dege, and J. D. Lipscomb, Methane monooxygenase from Methylosinus trichosporium OB3b: purification and properties of a three component system with high specific activity from a Type II methanotroph, J. Biol. Chem., 264: 10023 (1989).
B. G. Fox, Y. Liu, J. E. Dege, and J. D. Lipscomb, Complex formation between the protein components of methane monooxygenase from Methylosinus trichosporium OB3b, J. Biol. Chem., 266:540 (1991).
A. C. Stainthorpe, J. C. Murrell, G. P. C. Salmond, and H. Dalton, Molecular analysis of methane monooxygenase from Methylococcus capsulatus (Bath), Arch. Microbiol., 152:154 (1989).
J. G. DeWitt, J. G. Bentsen, A. C. Rosenzweig, B. Hedman, J. Green, S. Pilkington, G. C. Papaefthymiou, H. Dalton, K. O. Hodgson, and S. J. Lippard, X-ray absorption, Mössbauer, and EPR studies of the dinuclear iron center in the hydroxylase component of methane monooxygenase, submitted for publication.
B. G. Fox and J. D. Lipscomb, Purification of a high specific activity methane monooxygenase hydroxylase component from a Type II methanotroph, Biochem. Biophys. Res. Commun., 154:165 (1989).
J. B. Vincent, G. L. Olivier-Lilley, and B. A. Averill, Proteins containing oxo-bridged dinucleae iron centers: a bioinorganic perspective, Chem. Rev., 90:1447 (1990).
J. Green and H. Dalton, Protein B of soluble methane monooxygenase from Methylococcus capsulatus (Bath). A novel protein of enzyme activity, J. Biol. Chem., 260:15795 (1985).
J. Lund and H. Dalton, Further characterisation of the FAD and Fe2S2 redox centres of component C, the NADH: acceptor reductase of the soluble methane monooxygenase of Methylococcus capsulatus (Bath), Eur. J. Biochem., 147:291 (1985).
W. E. Wu and S. J. Lippard, unpublished results.
S. J. Pilkington, G. P. C. Salmond, J. C. Murrell, and H. Dalton, Identification of the gene encoding the regulatory protein B of soluble methane monooxygenase, FEMS Microbiol. Lett, 72:345 (1990).
W. E. Wu and S. J. Lippard, unpublished results.
A. C. Rosenzweig and S. J. Lippard, unpublished results.
A. C. Stainthorpe, V. Lees, G. P. C. Salmond, H. Dalton, and J. C. Murrell, The methane monooxygenase gene cluster of Methylococcus capsulatus (Bath), Gene, 91:27 (1990).
A. Ericson, B. Hedman, K. O. Hodgson, J. Green, H. Dalton, J. G. Bentsen, R. H. Beer, and S. J. Lippard, Structural characterization by EXAFS spectroscopy of the binuclear iron center in protein A of methane monooxygenase from Methylococcus capsulatus (Bath), J. Am. Chem. Soc., 110:2330 (1988).
W. H. Armstrong and S. J. Lippard, Reversible protonation of the oxo bridge in a hemerythrin model compound. Synthesis, structure, and properties of (μ-hydroxo) bis(μ-acetato)-bis[hydrotris(l-pyrazolyl)borato]diiron(III), [(HB(pz)3)Fe(OH)(O2CCH3)2Fe(HB(pz)3)]+, J. Am. Chem. Soc., 106:4632 (1984).
W. H. Armstrong, A. Spool, G. C. Papaefthymiou, R. B. Frankel, and S. J. Lippard, Assembly and characterization of an accurate model for the diiron center in hemerythrin, J. Am. Chem. Soc., 106:3653 (1984)
B. Hedman, M. S. Co, W. H. Armstrong, K. O. Hodgson, and S. J. Lippard, EXAFS studies of dinuclear iron complexes as models for hemerythrin and related proteins, Inorg. Chem., 25:3708 (1986).
R. C. Prince, G. N. George, J. C. Savas, S. P. Cramer, and R. N. Patel, Spectroscopic properties of the hydroxylase of methane monooxygenase, Biochim. Biophys. Acta, 952:220 (1988).
X. Feng and S. J. Lippard, unpublished results.
P. J. Marini, K. S. Murray, and B. O. West, Iron complexes of N-substituted thiosalicylideneimines. Part 1. Synthesis and reactions with oxygen and carbon monoxide. J. Chem. Soc., Dalton Trans., 143 (1983).
B. P. Murch, F. C. Bradley, and L. Que, Jr., A dinuclear iron peroxide complex capable of olefin epoxidation, J. Am. Chem. Soc, 108:5027 (1986).
Q. Chen, J. B. Lynch, P. Gomez-Romero, A. Ben-Hussein, G. B. Jameson, C. J. O’Connor, and L. Que, Jr., Iron oxo aggregates. Dinuclear and tetranuclear complexes of N, N, N’, N’-tetrakis(2-benzimidazolylmethyl)-2-hydroxy-1, 3-diaminopropanol, Inorg. Chem., 27:2673 (1988).
S. Yan, D. D. Cox, L. L. Pearce, C. Juarez-Garcia, L. Que, Jr., J. H. Zhange, and C. J. O’ Connor, A(μ-oxo)(μ-carboxylato)diiron(III) complex with distinct iron sites, Inorg. Chem., 28:2507 (1989).
F. Arena, C. Floriani, A. Chiesi-Villa, C. Guastini, A mixed valence μ-oxo iron(III)-iron(III) complex: a polynuclear iron-sodium-oxo aggregate from the chemical reduction of a μ-oxo diiron(III) complex, J. Chem. Soc, Chem. Commun., 1369 (1986).
W. B. Tolman, A. Bino, and S. J. Lippard, Self-assembly and dioxygen reactivity of an asymmetric, triply bridged diiron(II) complex with imidazole ligands and an open coordination site, J. Am. Chem. Soc, 111:8522 (1989).
D. M. Kurtz, Oxo-and hydroxo-bridged diiron complexes: a chemical perspective on a biological unit, Chem. Rev., 90:585 (1990).
A. C. Rosenzweig, C. Bender, J. Peisach, and S. J. Lippard, unpublished results.
W. B. Tolman, S. Liu, J. G. Bentsen, and S. J. Lippard, Models of the reduced forms of polyiron oxo proteins: an asymmetric, triply carboxylate bridged diiron(II) complex and its reaction with dioxygen, J. Am. Chem. Soc, 113:152 (1991).
A. S. Borovik and L. Que, Jr., Models for the FeIIFeIII and FeIIFeII forms of iron-oxo proteins, J. Am. Chem. Soc., 110:2345 (1988).
K. E. Liu and S. J. Lippard, Redox properties of the hydroxylase component of methane monooxygenase from Methylococcus capsulatus (Bath)-effects of protein B, reductase, and substrate, J. Biol. Chem., in press.
A. Stassinopoulos, G. Schulte, G. C. Papaefthymiou, and J. P. Caradonna, Synthesis, structure, and electronic characterization of reactive diiron(II) 1, 2-bis-(2-hydroxybenzamido)benzene complexes as models for methane monooxygenase, submitted for publication.
P. Cofré, S. A. Richert, A. Sobkowjak, and D. T. Sawyer, Redox chemistry of iron picolinate complexes and of their hydrogen peroxide and dioxygen adducts, Inorg. Chem., 29:2645 (1990).
X. Feng and S. J. Lippard, unpublished results.
W. Micklitz, S. G. Bott, J. G. Bentsen, and S. J. Lippard, Characterization of a novel μ4-peroxide tetrairon unit of possible relevance to intermediates in metal-catalyzed oxidations of water to dioxygen, J. Am. Chem. Soc., 111:372 (1989).
N. Kitajima, H. Fukui, Y. Moro-oka, Y. Mizutani and T. Kitagawa, Synthetic model for dioxygen binding sites of non-heme iron proteins: X-ray structure of Fe(OBz)(MeCN)(HB(3, 5-iPr2pz)3 and resonance Raman evidence for reversible formation of peroxo adduct, J. Am. Chem. Soc., 112:6402 (1990).
S. Menage, B. A. Brennan, C. Juarez-Garcia, E. Münck, and L. Que, Jr., Models for iron-oxo proteins: Dioxygen binding to a diferrous complex, J. Am. Chem. Soc, 112:6423 (1990).
X. Feng, M. E. Roth, D. P. Bancroft, and S. J. Lippard, manuscript to be submitted.
N. Kitajima, H. Fukui, and Y. Moro-oka, A model for methane monooxygenase: Dioxygen oxidation of alkanes by use of a μ-oxo dinuclear iron complex, J. Chem. Soc, Chem Commun., 485 (1988).
J. B. Vincent, J. C. Huffman, G. Christou, Q. Li, M. A. Nanny, D. N. Hendrickson, R. H. Fong, and R. H. Fish, Modeling the dinuclear sites of iron biomolecules: Synthesis and properties of Fe2O(OAc)2Cl2(bipy)2 and its use as an alkane activation catalyst, J. Am. Chem. Soc., 110:6898 (1988).
G. Balavoine, D. H. R. Barton, J. Boivin, A. Gref, P. L. Coupanec, N. Ozbalik, J. A. X. Pestana, and H. Riviere, Functionalization of saturated hydrocarbons. Part X. A comparative study of chemical and electrochemical processes (GIF and GIF-Orsay systems) in pyridine, in acetone and in pyridine-co-solvent mixtures, Tetrahedron, 44:1091 (1988).
S. Inbar, A. Ehret, and K. Norland, Oxidation of tetramethyl reductic acid by silver halide, Abstracts of Papers, Natl. Meet. Soc. Photogr. Sci., Minneapolis, MN, USA (1987).
G. A. Hamilton, R. J. Workman, and L. Woo, Oxidation by molecular oxygen. I. Reaction of a possible model system for mixed-function oxidases, J. Am. Chem. Soc, 86:3390 (1964).
G. A. Russel, Reactivity, selectivity, and polar effects in hydrogen atom transfer reaction, in “Free Radicals”, J. K. Kochi Ed., Wiley: New York, Vol. I:pp. 275 (1973).
J. Green and H. Dalton, Substrate specificity of soluble methane monooxygenase, J. Biol. Chem., 264: 17698 (1989).
J. T. Groves, Mechanisms of metal-catalysed oxygen insertion, in “Metal Ion Activation of Dioxygen”, T. G. Spiro ed., Wiley: New York, pp. 125 (1980).
J. T. Groves, and D. V. Subramanian, Hydroxylation by cytochrome P-450 and metalloporphyrin models. Evidence for allylic rearrangement, J. Am. Chem. Soc., 106:2177 (1984).
C. R. E. Jefcoate, J. R. L. Smith, and R. O. C. Norman, Hydroxylation. Part IV. Oxidation of some benzenoid compounds by Fenton’s reagent and the ultraviolet irradiation of hydrogen peroxide. J. Chem. Soc. B:1013 (1969).
J. T. Groves and T. E. Nemo, Aliphatic hydroxylation catalyzed by iron porphyrin complexes. J. Am. Chem. Soc, 105:6243 (1983).
D. H. R. Barton, J. Boivin, N. Ozbalik and K. M. Schwartzentruber, On the mechanism of the Gif system for the oxidation of saturated hydrocarbons, Tetrahedron Lett., 26:447 (1985).
S. G. Jezequel and I. J. Higgins, Mechanistic aspects of biotransformations by the monooxygenase system of M. trichosporium OB3b, J. Chem. Tech. Biotechnol., 33B:139 (1983).
H. Dalton and D. J. Leak, Mechanistic studies on the mode of action of methane monooxygenase, in “Gas Enzymology”, H. Degn, R. P. Cox, and H. Toftlund eds., Reidel: Dordrecht, Holland, pp. 169 (1985).
S. R. Boone, G. H. Purser, H. R. Chang, M. D. Lowery, D. N. Hendrickson, and C. G. Pierpont, Magnetic exchange interactions in semiquinone complexes of iron. Structural and magnetic properties of Tris(3, 5-di-tert-utylsemiquinonato)tetrakis(3, 5-di-tert-butylcatecholato) tetrairon (III), J. Am. Chem. Soc, 111:2292 (1989).
R. M. Solbrig, L. L. Duff, D. F. Shriver, and I. M. Klotz, Raman and infrared spectroscopy of the oxo-bridged iron (III) complex, [Cl3Fe-O-FeCl3]2- as a spectroscopic model for the oxo bridge in hemerythrin and ribonucleotide reductase, J. Inorg. Biochem., 17:69 (1982).
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Rosenzweig, A.C., Feng, X., Lippard, S.J. (1991). Studies of Methane Monooxygenase and Alkane Oxidation Model Complexes. In: Kelly, J.W., Baldwin, T.O. (eds) Applications of Enzyme Biotechnology. Industry-University Cooperative Chemistry Program Symposia. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9235-5_6
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