Arginine Metabolism in the Deep Sea Tube Worm Riftia pachyptila and Its Bacterial Endosymbiont

Hervé, Guy

doi:10.1074/jbc.m307835200

Cited by 24 publications

(25 citation statements)

References 59 publications

(63 reference statements)

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“…Therefore, in addition to CO 2 transport, the CAs can provide also HCO 3 − for various enzymes that can assimilate carbon. For example, the first enzymes, carbamylphosphate synthetase, in the arginine biosynthetic pathway and the pyrimidine de novo pathway use the inorganic HCO 3 − to initiate the biosynthesis [117,118]. The existence of these enzymes has been studied in all the tissues of Riftia .…”

Section: Fixation and Assimilation Of Carbonmentioning

confidence: 99%

“…The results indicate that the first three enzymes of the de novo pyrimidine nucleotide pathway, carbamylphosphate synthetase, aspartate transcarbamylase and dihydroorotase are present only in the trophosome, the symbiont-harboring tissue [117]. Concerning the arginine biosynthetic pathway, it appears that the ammonium dependent carbamylphosphate synthetase is present in all the body parts of R. pachyptila as well as in the bacterial symbiont [118]. The unusual distribution of the enzymes of the de novo pyrimidine nucleotide pathway in all the tissues of R. pachyptila indicates that the metabolic relationship between R. pachyptila and its endosymbiont is clearly essential for the survival of both organisms.…”

Section: Fixation and Assimilation Of Carbonmentioning

confidence: 99%

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The Biological Deep Sea Hydrothermal Vent as a Model to Study Carbon Dioxide Capturing Enzymes

Minić

Thongbam

2011

Marine Drugs

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Deep sea hydrothermal vents are located along the mid-ocean ridge system, near volcanically active areas, where tectonic plates are moving away from each other. Sea water penetrates the fissures of the volcanic bed and is heated by magma. This heated sea water rises to the surface dissolving large amounts of minerals which provide a source of energy and nutrients to chemoautotrophic organisms. Although this environment is characterized by extreme conditions (high temperature, high pressure, chemical toxicity, acidic pH and absence of photosynthesis) a diversity of microorganisms and many animal species are specially adapted to this hostile environment. These organisms have developed a very efficient metabolism for the assimilation of inorganic CO2 from the external environment. In order to develop technology for the capture of carbon dioxide to reduce greenhouse gases in the atmosphere, enzymes involved in CO2 fixation and assimilation might be very useful. This review describes some current research concerning CO2 fixation and assimilation in the deep sea environment and possible biotechnological application of enzymes for carbon dioxide capture.

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Section: Fixation and Assimilation Of Carbonmentioning

confidence: 99%

Section: Fixation and Assimilation Of Carbonmentioning

confidence: 99%

The Biological Deep Sea Hydrothermal Vent as a Model to Study Carbon Dioxide Capturing Enzymes

Minić

Thongbam

2011

Marine Drugs

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“…The kinetic properties of the ornithine transcarbamylase found in Riftia strongly suggest that neither the worm nor the bacterium possess the catabolic form of this enzyme belonging to the arginine deiminase pathway. This conclusion was confirmed by the lack of arginine deiminase in both the worm and the bacterium [74].…”

Section: Lack Of Arginine Catabolism Via the Catabolic Ornithine Tranmentioning

confidence: 83%

Biochemical and enzymological aspects of the symbiosis between the deep‐sea tubeworm Riftia pachyptila and its bacterial endosymbiont

Minić

Hervé

2004

European Journal of Biochemistry

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Riftia pachyptila (Vestimentifera) is a giant tubeworm living around the volcanic deep-sea vents of the East Pacific Rise. This animal is devoid of a digestive tract and lives in an intimate symbiosis with a sulfur-oxidizing chemoautotrophic bacterium. This bacterial endosymbiont is localized in the cells of a richly vascularized organ of the worm: the trophosome. These organisms are adapted to their extreme environment and take advantage of the particular composition of the mixed volcanic and sea waters to extract and assimilate inorganic metabolites, especially carbon, nitrogen, oxygen and sulfur. The high molecular mass hemoglobin of the worm is the transporter for both oxygen and sulfide. This last compound is delivered to the bacterium which possesses the sulfur oxidizing respiratory system, which produces the metabolic energy for the two partners. CO 2 is also delivered to the bacterium where it enters the Calvin-Benson cycle.Some of the resulting small carbonated organic molecules are thus provided to the worm for its own metabolism. As far as nitrogen assimilation is concerned, NH 3 can be used by the two partners but nitrate can be used only by the bacterium. This very intimate symbiosis applies also to the organization of metabolic pathways such as those of pyrimidine nucleotides and arginine. In particular, the worm lacks the first three enzymes of the de novo pyrimidine biosynthetic pathways as well as some enzymes involved in the biosynthesis of polyamines. The bacterium lacks the enzymes of the pyrimidine salvage pathway. This symbiotic organization constitutes a very interesting system to study the molecular and metabolic basis of biological adaptation.

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“…Arginine decarboxylase and ornithine decarboxylase are involved in the biosynthesis of polyamines such as putrescine and agmatine. These activities are present in the trophosome, the symbiont-harboring tissue, and are higher in the isolated bacteria than in the trophosome, indicating that these enzymes are of bacterial origin (Minie and Herve, 2003). This indicates that Riftia is dependent on its bacterial endosymbiont for the biosynthesis of polyamines that are important for its metabolism and physiology.…”

Section: Compartmentation Of Metabolic Pathways Between the Host And mentioning

confidence: 94%

Organisms of deep sea hydrothermal vents as a source for studying adaptation and evolution

Minic

2009

Symbiosis

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It has been postulated that life originated in a similar environment to those of deep sea hydrothermal vents. These environments are located along volcanic ridges and are characterized by extreme conditions such as unique physical properties (temperature. pressure). chemical toxicity, and absence of photosynthesis. However, numerous living organisms have been discovered in these hostile environments, including a variety of microorganisms and many animal species which live in intimate and complex symbioses with sulfo-oxidizing and methanotrophic bacteria. Recent proteomic analyses of the endosymbiont of Riftia pachyptila and genome sequences of some free living and symbiotic bacteria have provided complementary information about the potential metabolic and genomic capacities of these organisms. The evolution of these adaptive strategies is connected with different mechanisms of genetic adaptation including horizontal gene transfer and . various structural and functional mutations. Therefore, the organisms in this environment are good models for studying the evolution of prokaryotes and eukaryotes as well as different aspects of the biology of adaptation. This review describes some current research concerning metabolic and plausible genetic adaptations of organisms in a deep sea environment, using Riftia pachyptila as model.

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Arginine Metabolism in the Deep Sea Tube Worm Riftia pachyptila and Its Bacterial Endosymbiont

Cited by 24 publications

References 59 publications

The Biological Deep Sea Hydrothermal Vent as a Model to Study Carbon Dioxide Capturing Enzymes

The Biological Deep Sea Hydrothermal Vent as a Model to Study Carbon Dioxide Capturing Enzymes

Biochemical and enzymological aspects of the symbiosis between the deep‐sea tubeworm Riftia pachyptila and its bacterial endosymbiont

Organisms of deep sea hydrothermal vents as a source for studying adaptation and evolution

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