Only the amount needed by the cell is reduced. 2. Most online reference entries and articles do not have page numbers. Iron is a trace element in marine environments. Chemolithotrophy sulfur oxidation metabolism. Evol. 0000002347 00000 n
[citation needed], As Liebig's law of the minimum notes, the essential element present in the smallest amount (called limiting factor) is the one that determines the growth rate of a population. (ed.) PubMed The scale bar represents 5% nucleotide substitutions. 0000002568 00000 n
23 338364, Volkl, P., Huber, R., Drobner, E., Rachel, R., Burggraf, S., Trincone, A. 48 105109, Friedrich, C., Mitrenga, G. 1981 Oxidation of thiosulfate by Paracoccusdenitrificans and other hydrogen bacteria FEMS Microbiol. Antonie van Leeuwenhoek Journal of Microbiology and Serology 42:483492. %%EOF
Enzymes of a reductive citric acid cycle in the autotrophic Desulfobacter hydrogenophilus Arch. 2018 Jan 1;610-611:951-960. doi: 10.1016/j.scitotenv.2017.08.166. Indeed, the inorganic processes associated with chemoautotrophs and chemolithotrophs may make these bacteria one of the most important sources of weathering and erosion of rocks on Earth. Chemolithotrophs use a variety of inorganic compounds as electron donors, with the most common substances being hydrogen gas, sulfur compounds (such as sulfide and sulfur), nitrogen compounds (such as ammonium and nitrite), and ferrous iron. 33 slides Chemoautotrophs and photosynthetic eubacteria ramukhan 9.5k views 70 slides FERMENTATIONS , PHOTOSYNTHESIS & NITROGEN FIXATION Vidya Kalaivani Rajkumar 1k views 23 slides B.Sc Micro II Microbial physiology Unit 1 Bacterial Photosynthesis Rai University 48.2k views 68 slides Slideshows for you Weve updated our privacy policy so that we are compliant with changing global privacy regulations and to provide you with insight into the limited ways in which we use your data. Isolation and characterization of Desulfovibrio growing on hydrogen plus sulfate as the sole energy source. Plant and Soil 43:587601. 20 337341, McDonald, I. R., Kelly, D. P., Murrell, J. C., Wood, A. P. 1997 Taxonomic relationships of Thiobacillus halophilus, T. Aquaesulis, and other species of Thiobacillus, as determined using 16S rRNA sequencing Arch. Nitrogen fixation describes the conversion of the relatively inert dinitrogen gas (N2) into ammonia (NH3), a much more useable form of nitrogen for most life forms. 1989 Sergei N. Winogradsky and the discovery of chemosynthesis H. G. Schlegel and B. Bowien (ed.) Bergeys manual of systematic bacteriology, vol. 1972. Journal of Bacteriology 110:633642. 3 159196, Rittenberg, S. C. 1972 The obligate autotrophthe demise of a concept Antonie van Leeuwenhoek J. Microbiol. 0000006550 00000 n
abundant at hydrothermal vents of the Guaymas Basin Appl. Most chemolithotrophs are autotrophs (chemolithoautotrophs), where they fix atmospheric carbon dioxide to assemble the organic compounds that they need. Weinheim: Verlag Chemie. Aleem, M. I. H. 1975. Microbial growth on C1-compounds American Society for Microbiology Washington D. C. Kelly, D. P. 1985 Crossroads for archaebacteria Nature 313 734, Kelly, D. P. 1987 Sulphur bacteria first again Nature 326 830831, Kelly, D. P. 1988 Oxidation of sulphur compounds Soc. Microbiol. Find out more about the Kindle Personal Document Service. Received 28 September 2005/ Accepted 17 February 2006, Last edited on 28 December 2022, at 15:47, "Visions of Life on Mars in Earth's Depths", "The Carbon-Concentrating Mechanism of the Hydrothermal Vent Chemolithoautotroph Thiomicrospira crunogena", International Journal of Systematic and Evolutionary Microbiology, "Widespread Iron Limitation of Phytoplankton in the South Pacific Ocean", https://en.wikipedia.org/w/index.php?title=Chemotroph&oldid=1130098658, This page was last edited on 28 December 2022, at 15:47. 169 460463, Stanley, S. H., Dalton, H. 1982 Role of ribulose-1,5-biphosphate carboxylase/oxygenase in Methylococcus capsulatus J. Gen. Microbiol. 1971 Autotrophic growth and synthesis of reserve polymers in Nitrobacter winogradskyi Arch. 0000084636 00000 n
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166 181186, Davis, O. H., Doudoroff, M., Stanier, R. Y. The phylogeny of autotrophic ammonia-oxidizing bacteria as determined by analysis of 16S ribosomal RNA gene sequences, Quantification of ammonia-oxidizing bacteria in arable soil by real-time PCR, Evidence that particulate methane monooxygenase and ammonia monooxygenase may be evolutionarily related, Enzymology of the oxidation of ammonia to nitrite by bacteria, A survey of 16 S rRNA and amoA genes related to autotrophic ammonia-oxidizing bacteria of the beta-subdivision of the class proteobacteria in contaminated groundwater, Mathematical modeling of autotrophic denitrification in a nitrifying biofilm of a rotating biological contactor, Ammonia-oxidizing bacteria: a model for molecular microbial ecology. Env. Then, copy and paste the text into your bibliography or works cited list. Some microbes are chemolithoheterotrophs, using an inorganic chemical for their energy and electron needs, but relying on organic chemicals in the environment for their carbon needs. Nutritional types in bacteria: Chemolithotrophy. 0000002764 00000 n
11 2657, Segerer, A., Stetter, K. O., Klink, F. 1985 Two contrary modes of chemolithotrophy in the same bacterium Nature 313 787789, Segerer, A., Neuner, A., Kristjansson, J. K., Stetter, K. O. Microbiol. 1966 A new ferredoxin-dependent carbon reduction cycle in a photosynthetic bacterium Proc. Encyclopedia of Geobiology pp 271272Cite as, Part of the Encyclopedia of Earth Sciences Series book series (EESS). In: Schwartz, W., (ed. Broda, E. 1977a. Science Progress 55:3551. Epub 2016 Aug 5. Rev. Colorful Retro Vintage Illustration Animated Medical Technology Education Sci Diversity and Selection of Shell of the Hermit Crab of Mandvi, Kachchh Coast, A Pragmatic Approach for Solving the Sports Scheduling Problem-presentation.pdf, Simulations of Test Reduction Using Pooled Heavy Metals Analysis inCannabis, Easy-handling carbon nanotubes decorated poly(arylene ether nitrile).pdf, IMPORTANCE OF RAINFOREST PLANTS FOR THE SIEKOPAI PEOPLE OF THE AMAZON.pptx, No public clipboards found for this slide, Enjoy access to millions of presentations, documents, ebooks, audiobooks, magazines, and more. 324329. We use cookies to distinguish you from other users and to provide you with a better experience on our websites. chemolithotrophy, hydrogen oxidizers, hydrogenase, sulfur oxidizers, sulfite oxidase, nitrogen oxidizers, nitrification, iron oxidizers, chemolithoautotroph, reverse electron flow, chemolithoheterotroph, mixotroph, nitrogen fixation, diazotroph, nitrogenase, symbiotic nitrogen-fixing organisms, Rhizobium, legume, free-living nitrogen-fixing organisms, Cyanobacteria, heterocyst, assimilation, ammonia assimilation, assimilative nitrate reduction, denitrification, dissimilatory nitrate reduction, anammox, anaerobic ammonia oxidation, anammoxosome. Biotechnol. By accepting, you agree to the updated privacy policy. In a reaction, the reactant molecules come together a, In classical physics, energy is defined as the amount of work a body or system is capable of doing against a force. Looks like youve clipped this slide to already. Bacteriological Reviews 26:6794. 129 221226, Beudeker, R. F., de Boer, W., Kuenen, J. G. 1981bHeterolactic fermentation of intracellular polyglucose by the obligate chemolithotroph Thiobacillus neapolitanus under anaerobic conditions FEMS Microbiol. Most chemoautotrophs are extremophiles, bacteria or archaea that live in hostile environments (such as deep sea vents) and are the primary producers in such ecosystems. Autotrophic metabolism of formate by Thiobacillus strain A2. The acceptance of an electron by an oxygen atom creates water and sulfur. Natl. Bacterial energetics Academic Press San Diego. 1976. Appl. Eccleston, M., Kelly, D. P. 1978. Department-Microbiology(2nd semester) Electron micrographs of GISH for OTU0001 on a mineral-enriched biochar particle. Winogradsky, S., 1888. Specifically, an organism that is described as being aerobic (or an aerobe) means that t, Chemistry: States of Matter: Solids, Liquids, Gases, and Plasma, Chemistry: Molecular Structure and Stereochemistry, Chemistry: Fermentation: A Cultural Chemistry, Chemistry: Chemical Reactions and the Conservation of Mass and Energy, Chemistry: Biochemistry: The Chemistry of Life, Chemistry: Applications in Espionage, Intelligence, and Security Issues, Chemoautotrophic and Chemolithotrophic Bacteria as Weathering Agents. Justin, P., Kelly, D. P. 1978. This produces large amounts of excess byproducts, resulting in the loss of nitrogen from the local environment to the atmosphere. 2325 0 obj
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Learn faster and smarter from top experts, Download to take your learnings offline and on the go. A., Shively, J. M. 1989b Occurrence and regulation of Calvin cycle enzymes in non-autotrophic Beggiatoa strains Arch. What are the different mechanisms of nitrogen metabolism? 478503, Kelly, D. P., Smith, N. A. Brierley, J. Autotrophic bacteria Springer-Verlag Berlin and Science Tech Publishers Madison WI 1732, Zillig, W., Yeats, S., Holz, I., Bck, A., Gropp, F., Rettenberger, M., Lutz, S. 1985 Plasmid-related anaerobic autotrophy of the novel archaebacterium Sulfolobus ambivalens Nature 313 789791, Zillig, W., Yeats, S., Holz, I., Bck, A., Rettenberger, M., Gropp, F., Simon, G. 1986 Desulfurolobus ambivalens gen. nov., sp. Find out more about saving content to Google Drive. 166 368371, Jannasch, H. W., Wirsen, C. O. Bookshelf Aerobic and anaerobic reactions of inorganic substances, pp. 107 123130, Katayama, Y., Hiraishi, A., Kuraishi, H. 1995 Paracoccus thiocyanatus sp. ( a ) Non-metric multidimensional scaling plot illustrating the similarities between individual samples, Phylogenetic tree based on the OTU0001s partial 16S rRNA gene sequence (482 nucleotides), Metabolic reconstructions of the three dominant bacteria (that is, Gama1, Oxal1 and Thio1), Electron micrographs of GISH for OTU0001 on a mineral-enriched biochar particle. 0000012411 00000 n
59 29182926, Wachtershauser, G. 1988 Before enzymes and templates: theory of surface metabolism Microbiol. 1963 Thiobacillus intermedius nov. sp. Pop. Autotrophy and the origins of metabolism Trends Biochem. Tap here to review the details. 140 321325, Lane, D. J., Harrison, A. P., Stahl, D., Pace, B., Giovannoni, S. J., Olsen, G. J., Pace, N. P. 1992 Evolutionary relationships among sulfur-and iron-oxidizing eubacteria J. Bacteriol. 2. Microbiol. nov., a marine obligately chemolithotrophic hydrogen-oxidizing bacterium Int. European Journal of Applied Microbiology and Biotechnology 5:291299. Lett. A non-nitrogen compound would serve as the electron acceptor. Symposium of the Society for General Microbiology 27:121149. Chemolithotrophy & Nitrogen Metabolism. Epub 2019 Jan 24. nov. with emendation of the genus Microbiology (UK) 141 14691477, Katayama-Fujimura, Y., Kuraishi, H. 1983 Emendation of Thiobacillus perometabolis London and Rittenberg, 1967 Int. 1957 The origin of life on the Earth Oliver and Boyd Edinburgh. (February 22, 2023). [10], Iron is a very important element required by living organisms to carry out numerous metabolic reactions such as the formation of proteins involved in biochemical reactions. Mechanisms of inorganic oxidations and energy coupling. 32 567571, Broda, E. 1977aThe position of nitrate respiration in evolution Origins of Life 8 173174, Broda, E. 1977bTwo kinds of lithotrophs missing in nature Z. Allg. 1977. Biochemical reaction mechanisms in sulphur oxidation by chemosynthetic bacteria. 46 329337, London, J., Rittenberg, S. C. 1967 Thiobacillus perometabolis nov. ), Microbial growth and survival in extremes of environment. Front Plant Sci. . A., Denend, A. R. 1972. Find out more about saving content to Dropbox. London B298 499528, Kelly, D. P., Wood, A. P. 1982 Autotrophic growth of Thiobacillus A2 on methanol FEMS Microbiol. National Library of Medicine FOIA - 103.138.151.18. Instant access to millions of ebooks, audiobooks, magazines, podcasts and more. Baas Becking, L. G. M., Parks, G. S. 1927. Our results show the dominance of chemolithotrophic processes on the surface of biochar and MEB that can contribute to carbon sequestration in soil. nov. by disproportionation of inorganic sulfur compounds Arch. 22 Feb. 2023 . 0000006065 00000 n
The SlideShare family just got bigger. Rev. McFadden, B. Brock, T. D., Gustafson, J. How do chemolithoautotrophs and chemolithoheterotrophs differ? 10 147151, Gogarten, J. P., Taiz, L. 1992 Evolution of proton pumping ATPases_rooting the tree of life Photosynthesis Research 33 137146, Gogarten, J. P., Olendzenski, L., Hilario, E., Simon, C., Holsinger, K. E. 1996 Dating the cenancestor of organisms Science 274 17501751, Gogarten-Boeckels, M., Hilario, E., Gogarten, J. P. 1995 The effects of heavy meteroritic bombardment on the early evolutionthe emergence of the three domains of life Origins of Live Evol. Clipping is a handy way to collect important slides you want to go back to later. Chemoheterotrophs (or chemotrophic heterotrophs) are unable to fix carbon to form their own organic compounds. 2019 May 10;664:11-23. doi: 10.1016/j.scitotenv.2019.01.298. By whitelisting SlideShare on your ad-blocker, you are supporting our community of content creators. Microbiol. Reduced sulfur, nitrogen and iron species and hydrogen are the most common substrates (Table 1). Environ. 0000055936 00000 n
The chemolithotrophic bacteria and archaea are defined by their ability to oxidize inorganic atoms or molecules as a growth-supporting reductant and energy source. Mikrobiol. The ability of chemoautotrophic and chemolithotrophic bacteria to thrive through the energy gained by inorganic processes is the basis for the metabolic activities of the so-called extremophiles . "Chemoautotrophic and Chemolithotrophic Bacteria In: Dworkin, M., Falkow, S., Rosenberg, E., Schleifer, KH., Stackebrandt, E. (eds) The Prokaryotes. Google Scholar. 1974. nov Int. Aerobic refers to oxygen as it concerns an organism. 2011 Springer Science+Business Media B.V. Thiel, V. (2011). Microbiol. A., Brierley, C. L. 1968 Urea as a nitrogen source of thiobacilli J. Bacteriol. Environ. Moreover, it has been suggested that the metabolic capabilities of extremophiles could be duplicated on extraterrestrial planetary bodies. DEEPALI Lyalikova, N. N. 1972. The process was first described by the Russian microbiologist Sergej Winogradsky (1887, 1888). Altmetric. Chemolithotrophy Microbiol. 0000008879 00000 n
The position of nitrate respiration in evolution. If the energy source consists of large chemicals that are complex in structure, as is the case when the chemicals are derived from once-living organisms, then it is the chemoautotrophic bacteria that utilize the source. These are called chemolithotrophs. Anammox or anaerobic ammonia oxidation is performed by marine bacteria, relatively recently discovered, that utilize nitrogen compounds as both electron acceptor and electron donor as a way for the cell to generate energy. Rev. Chemoautotrophs include bacteria, fungi , animals, and protozoa . Springer-Verlag New York NY 2 in press, Khmelenina, V. N., Gayazov, R. R., Suzina, N. E., Doronina, V. A., Mshenshii, Y. N., Trotsenko, Y. Proceedings of the National Academy of Sciences of the United States of America 54:869873. 0000013722 00000 n
160 306311, Beudeker, R. F., Kerver, J. W. M., Kuenen, J. G. 1981aOccurrence, structure, and function of intracellular polyglucose in the obligate chemolithotroph Thiobacillus neapolitanus Arch. Mechanisms of chemoautotrophy, pp. The only source of life for the thriving bacterial populations that adhere to the rocks are the rocks and the chemistry of the groundwater. Characteristics of a moderately thermophilic and acidophilic iron-oxidizing Thiobacillus. CAS [1] These molecules can be organic (chemoorganotrophs) or inorganic (chemolithotrophs). 1977 Evaluation of continuous chemostat cultivation of Thiobacillus ferrooxidans on ferrous iron or tetrathionate W. Schwartz (ed.) The bacteria live in the plant's tissue, often in root nodules, fixing nitrogen and sharing the results. 7 Microbiol. Environ. Some of the electron donors used by chemolithotrophs have a redox potential higher than that of NAD(P)+/NAD(P)H (Table 10.1). To save content items to your account, The latter contain the compound chlorophyll , and so appear colored. 0000004523 00000 n
nov., a facultatively anaerobic, facultatively autotrophic sulphur bacterium J. Gen. Microbiol. However, at least 0.3 ppm of dissolved oxygen is needed to carry out the oxidation. 3, 37077, Gttingen, Germany, You can also search for this author in Pan Y, Kang P, Tan M, Hu J, Zhang Y, Zhang J, Song N, Li X. Microbiol. The term "Chemolithotrophy" refers to the gain of energy for cell biosynthesis and maintenance from the oxidation of inorganic compounds (= electron donors), in the absence of light (Kelly and Wood, 2006).The process was first described by the Russian microbiologist Sergej Winogradsky (1887, 1888).Chemolithotrophy is a strategy unique to some prokaryotes (i.e., Bacteria and Archaea), the . 1996 The 16S rDNA-based phylogeny of the archaeal order Sulfolobales and reclassification of Desulfurolobus ambivalens as Acidanus ambivalens comb. Metabolic reconstructions of the three dominant bacteria (that is, Gama1, Oxal1 and Thio1) on biochar and mineral-enriched biochar particles. 0000060407 00000 n
Most life on Earth depends, either directly or indirectly, on sunlight and photosynthesis to generate organic carbon and cellular energy. 38 457478, Robertson, L. A., Kuenen, J. G. 1983 Thiosphaera pantotropha gen. nov. sp. - 207.154.232.84. Microbiol. Mikrobiol. Abstract. 62 947953, Nelson, D. C., Jannasch, H. W. 1983 Chemoautotrophic growth of a marine Beggiatoa in sulfide-gradient cultures Arch. https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/chemoautotrophic-and-chemolithotrophic-bacteria, Biological Energy Use, Cellular Processes of. Accessibility Sci. Provided by the Springer Nature SharedIt content-sharing initiative, Over 10 million scientific documents at your fingertips, Not logged in Natl. That is, they derive their energy from the energy already stored in chemical compounds. Doklady Akademii Nauk SSSR 205:12281229. Annual Review of Plant Physiology 21:6790. 1992 Life at the upper temperature border J. Tran Thanh Van, K. Tran Thanh Van, H. C. Mounlou, J. Schneider, and C. McKay (ed.s) Frontiers of life, Editions Frontieres Gif-sur-Yvette France 195219, Taylor, S. 1977 Evidence for the presence of ribulose 1,5-bisphosphate carboxylase and phosphoribulokinase in Methylococcuscapsulatus (Bath) FEMS Microbiol. The litho is a word with a Greek root meaning stone, thus this group of bacteria is called stone eaters (2). nov., a novel hyperthermophilic archaeum that oxidizes Fe2 + at neutral pH under anoxic conditions, The chemolithotrophic bacterium Thiobacillus ferrooxidans, Reasons why Leptospirillum-like species rather than Thiobacillus ferrooxidans are the dominant iron-oxidizing bacteria in many commercial processes for the biooxidation of pyrite and related ores, A new chemolithoautotrophic arsenite-oxidizing bacterium isolated from a gold mine: phylogenetic, physiological, and preliminary biochemical studies, Response of Thiobacillus ferrooxidans to phosphate limitation, Enumeration and detection of anaerobic ferrous iron-oxidizing, nitrate-reducing bacteria from diverse European sediments, Anaerobic, nitrate-dependent microbial oxidation of ferrous iron, Molybdenum oxidation by Thiobacillus ferrooxidans, Molecular aspects of the electron transfer system which participates in the oxidation of ferrous ion by Thiobacillus ferrooxidans, Characterization and thermostability of a membrane-bound hydrogenase from a thermophilic hydrogen oxidizing bacterium, Bacillus schlegelii, Bioscience, Biotechnology and Biochemistry, Crystal structure and mechanism of CO dehydrogenase, a molybdo iron-sulfur flavoprotein containing S-selanylcysteine, Proceedings of the National Academy of Sciences, USA, Genetic analysis of Carboxydothermus hydrogenoformans carbon monoxide dehydrogenase genes cooF and cooS, Binding of flavin adenine dinucleotide to molybdenum-containing carbon monoxide dehydrogenase from Oligotropha carboxidovorans: structural and functional analysis of a carbon monoxide dehydrogenase species in which the native flavoprotein has been replaced by its recombinant counterpart produced in Escherichia coli, Genes encoding the NAD-reducing hydrogenase of Rhodococcus opacus MR11, Location, catalytic activity, and subunit composition of NAD-reducing hydrogenases of some Alcaligenes strains and Rhodococcus opacus MR22, Effect of molybdate and tungstate on the biosynthesis of CO dehydrogenase and the molybdopterin cytosine-dinucleotide-type of molybdenum cofactor in Hydrogenophaga pseudoflava, Phylogenetic position of an obligately chemoautotrophic, marine hydrogen-oxidizing bacterium, Hydrogenovibrio marinus, on the basis of 16S rRNA gene sequences and two form I RuBisCO gene sequences, Characterization of hydrogenase activities associated with the molybdenum CO dehydrogenase from Oligotropha carboxidovorans, Nitrate respiratory metabolism in an obligately autotrophic hydrogen-oxidizing bacterium, Hydrogenobacter thermophilus TK-6, Redox state and activity of molybdopterin cytosine dinucleotide (MCD) of CO dehydrogenase from Hydrogenophaga pseudoflava, The genes for anabolic 2-oxoglutarate:ferredoxin oxidoreductase from Hydrogenobacter thermophilus TK-6, Biochemical and Biophysical Research Communications, Oxidation of molecular hydrogen and carbon monoxide by facultatively chemolithotrophic vanadate-reducing bacteria, Whole-genome transcriptional analysis of chemolithoautotrophic thiosulfate oxidation by Thiobacillus denitrificans under aerobic versus denitrifying conditions, Carbon metabolism of filamentous anoxygenic phototrophic bacteria of the family Oscillochloridaceae, Organization of carboxysome genes in the thiobacilli, Retrobiosynthetic analysis of carbon fixation in the photosynthetic eubacterium Chloroflexus aurantiacus, Modified pathway to synthesize ribulose 1,5-bisphosphate in methanogenic Archaea, Properties of succinyl-coenzyme A:D-citramalate coenzyme A transferase and its role in the autotrophic 3-hydroxypropionate cycle of Chloroflexus aurantiacus, Properties of succinyl-coenzyme A:L-malate coenzyme A transferase and its role in the autotrophic 3-hydroxypropionate cycle of Chloroflexus aurantiacus, The molecular regulation of the reductive pentose phosphate pathway in Proteobacteria and cyanobacteria, Deduced amino acid sequence, functional expression, and unique enzymatic properties of the form I and form II ribulose bisphosphate carboxylase oxygenase from the chemoautotrophic bacterium Thiobacillus denitrificans, A bicyclic autotrophic CO2 fixation pathway in Chloroflexus aurantiacus, Autotrophic CO2 fixation pathways in archaea (Crenarchaeota), Evidence for autotrophic CO2 fixation via the reductive tricarboxylic acid cycle by members of the -subdivision of Proteobacteria, Autotrophic carbon dioxide fixation in Acidianus brierleyi, Occurrence, biochemistry and possible biotechnological application of the 3-hydroxypropionate cycle, Evidence for the presence of the reductive pentose phosphate cycle in a filamentous anoxygenic photosynthetic bacterium, Oscillochloris trichoides strain DG-6, Induction of carbon monoxide dehydrogenase to facilitate redox balancing in a ribulose bisphosphate carboxylase/oxygenase-deficient mutant strain of Rhodospirillum rubrum, Carbon metabolism in Eubacterium limosum: a C-13 NMR study, The role of an iron-sulfur cluster in an enzymatic methylation reaction: methylation of CO dehydrogenase/acetyl-CoA synthase by the methylated corrinoid iron-sulfur protein, A global signal transduction system regulates aerobic and anaerobic CO2 fixation in Rhodobacter sphaeroides, The reductive acetyl coenzyme A pathway.