User:Kbseah/Chemosynthetic symbiosis

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Chemosynthetic symbiosis is a type of symbiotic relationship between two or more species, where at least one partner is able to grow and reproduce using inorganic chemicals as an energy source (chemosynthesis). The other partner may rely on its chemosynthetic symbiont for food. Examples include the tubeworm Riftia pachyptila from deep-sea hydrothermal vents, and the bivalve family Lucinidae from seagrass ecosystems in coastal environments.

Chemosynthesis[edit]

Main article: Chemosynthesis

Chemosynthesis is the ability to use energy from chemical oxidation to synthesize new biomass from one-carbon compounds, such as carbon dioxide or methane.[1] Those organisms that use carbon dioxide obtain the energy for doing so by oxidizing other inorganic chemicals, such as hydrogen sulfide, a type of metabolism known as chemolithoautotrophy. Methane, on the other hand, can serve as a source of both carbon and energy, and organisms that can use it are known as methanotrophs. All known chemosynthetic organisms are prokaryotes. The term "chemosynthesis" was first used by Wilhelm Pfeffer in 1897, as a parallel to "photosynthesis".[2]

Discovery[edit]

  • The submersible Alvin, operated by WHOI
    The submersible Alvin, operated by WHOI
  • The submersible Cyana, operated by IFREMER
    The submersible Cyana, operated by IFREMER
  • Riftia pachyptila was the first recognized chemosynthetic symbiosis
    Riftia pachyptila was the first recognized chemosynthetic symbiosis
  • First discovered in 1977 at hydrothermal vents off the Galapagos
  • The abundance of animal life at these vents was unexpected
  • Several theories were proposed for how mouthless, gutless animals could feed themselves to grow and reproduce
  • Shown that they have sulfide-oxidizing bacteria in their bodies, which can gain energy from chemicals in the hydrothermal vent fluids, and fix carbon dioxide for growth.
  • Animals in other habitats, such as shallow-water seagrass beds, were also found to harbor such symbionts.

Diversity[edit]

Chemosynthetic symbiosis has evolved independently several times in different groups of eukaryotic hosts and bacterial symbionts. They are associated with many different host species, most of which are animals. They are found in at least six different phyla within the animal kingdom. One group of protists, the ciliates, also have such symbionts.[3] The vestimentiferan tube worms were originally classified in the phylum Pogonophora (beard worms), but subsequent studies showed that pogonophorans are actually annelid worms (phylum Annelida), and not a distinct phylum of their own.

Examples of eukaryotic hosts of chemosynthetic symbiosis
Kingdom Phylum Examples
Protista Cliliophora Zoothamnium niveum

Kentrophoros

Animalia Porifera Cladorhiza sp.[4]
Animalia Cnidaria Cladonema sp.[5]
Animalia Platyhelminthes Paracatenula
Animalia Annelida Riftia pachyptila, Lamellibrachia

Olavius algarvensis,

Animalia Mollusca All known members of the families or subfamilies:[6]

Some members of the family Thyasiridae[6]

Kuphus polythalamia

Animalia Nematoda Stilbonematinae (subfamily of Desmodoridae)

Astomonema

Animalia Arthropoda Rimicaris exoculata

The symbiotic microbes also come from different groups within the Bacteria. Most of the sulfur-oxidizing symbionts are members of the class Gammaproteobacteria, but some also belong to the Epsilonproteobacteria (e.g. symbionts of Rimicaris),[7] or Alphaproteobacteria (symbionts of Paracatenula).[8]

The known examples of methanotrophic symbionts are most closely related to the Type I subgroup of free-living aerobic methanotrophs within the class Gammaproteobacteria.[9][10]

Several species of chemosynthetic symbiotic bacteria have been given provisional scientific names, indicated by the prefix Candidatus. These taxa are only "putative", because they have not been cultivated in the laboratory, which is a requirement for the formal description of a microbial species.[11]

Examples of chemosynthetic symbionts with provisional scientific names
Candidatus name Classification Host organism
Endoriftia persephone[12] Gammaproteobacteria Riftia pachyptila
Riegeria spp.[13] Alphaproteobacteria Paracatenula spp.
Ruthia magnifica[14] Gammaproteobacteria Calyptogena magnifica
Thiobios zoothamnicoli[15] Gammaproteobacteria Zoothamnium niveum
Vesicomyosocius okutanii[16] Gammaproteobacteria Calyptogena okutanii

Some host species have more than one kind of chemosynthetic bacterium living as a symbiont. Several species of deep-sea mytilid mussels have both sulfur-oxidizing and methanotrophic bacteria living inside the cells of its gills.[17][18] The annelid worm Olavius algarvensis contains two different kinds of sulfur-oxidizing bacteria, in addition to three other types of bacteria that are heterotrophs.[19]

Anatomical specializations of host organisms[edit]

Olavius algarvensis is a symbiotic oligochaete worm that lacks a mouth and digestive tract

Digestive system[edit]

Many host species have lost or reduced their digestive tract (mouth, gut, anus) in the course of evolution. They are therefore thought to be completely reliant on their symbionts for food. Examples include Paracatenula, Olavius, and Astomonema, whose name is a direct reference to its lack of a mouth. The vestimentiferan tubeworms have a digestive tract during the larval stage of their life cycle, but this is lost during metamorphosis to the adult stage.[20]

In contrast, some hosts still have a digestive tract, e.g. the stilbonematine nematodes and the Rimicaris shrimp. They may feed like non-symbiotic animals, or could be grazing on the symbionts.

Location of symbionts in host body[edit]

Symbionts can be located at different parts of the host organism's body, depending on the species. The vestimentiferan tubeworms, such as Riftia pachyptila, have a specialized symbiont-bearing tissue called the trophosome that is located within the coelomic cavity in the trunk of the adult animal. The trophosome is well-supplied with blood vessels, and the bacteria are located inside cells called bacteriocytes.[20] In bivalves, the symbionts are often located in the gills. For example, the clam Solemya velum has unusually large gills (compared to other filter-feeding bivalves) that make up 38% of the animal's total weight. The bacteria are also contained within bacteriocyte cells, which alternate with symbiont-free cells in the gill tissue.[21] Symbionts can also be located extracellularly, such as the layer of symbionts attached to the cuticle of roundworms in the subfamily Stilbonematinae,[22] or attached to the carapace within the gill chamber of the deep-sea shrimp Rimicaris exoculata.[7]

Physiology and metabolism[edit]

Energy sources[edit]

Many chemosynthetic symbionts use hydrogen sulfide, or other chemically-reduced species of sulfur, as a source of energy and reducing equivalents for growth, with the following net reaction, where [CH2O] represents biomass:[2]

CO2 + H2S + 2 H2O -> [CH2O] + H2SO4.

Methanotrophs, which oxidize methane (CH4), can use it as both a source of energy and carbon for growth. Methanotrophic symbionts belong to the Type I subgroup of methanotrophs, which use the ribulose monophosphate (RuMP) pathway for assimilation of carbon.[9]

Symbionts that use hydrogen (H2)[23] and carbon monoxide (CO)[24] have also been discovered.

Carbon-fixation pathways[edit]

A variety of metabolic pathways for autotrophic carbon fixation are used by chemosynthetic symbionts to produce new biomass. The majority that fix carbon dioxide (CO2) use the Calvin-Benson-Bassham cycle, also known as the reductive pentose phosphate cycle. Methanotrophs, which use methane rather than carbon dioxide, use the RuMP pathway to fix carbon, as described above. The symbionts of the vent tubeworm Riftia pachyptila use two different autotrophic pathway: the Calvin-Benson-Bassham cycle and the reductive tricarboxylic acid cycle (Arnon-Buchanan cycle),[25] which is an alternative autotrophic pathway found in many anaerobic bacteria.[26]

Host physiological adaptations[edit]

Ecology[edit]

A sizeable fraction of animals at hydrothermal vents have chemosynthetic symbionts, e.g. these deep-sea bathymodioline bivalves
The flatworm Paracatenula is a meiofaunal symbiotic animal from shallow-water habitats

See also[edit]

References[edit]

  1. ^ Stewart, Frank J.; Newton, Irene L.G.; Cavanaugh, Colleen M. "Chemosynthetic endosymbioses: adaptations to oxic–anoxic interfaces". Trends in Microbiology. 13 (9): 439–448. doi:10.1016/j.tim.2005.07.007.
  2. ^ a b Jannasch, Holger W.; Mottl, Michael J. (1985-08-23). "Geomicrobiology of Deep-Sea Hydrothermal Vents". Science. 229 (4715): 717–725. doi:10.1126/science.229.4715.717. ISSN 0036-8075. PMID 17841485.
  3. ^ Dubilier, Nicole; Bergin, Claudia; Lott, Christian. "Symbiotic diversity in marine animals: the art of harnessing chemosynthesis". Nature Reviews Microbiology. 6 (10): 725–740. doi:10.1038/nrmicro1992.
  4. ^ Vacelet, Jean; Fiala-Médioni, Aline; Fisher, C. R.; Boury-Esnault, Nicole (1996). "Symbiosis between methane-oxidizing bacteria and a deep-sea carnivorous cladorhizid sponge" (PDF). Marine Ecology Progress Series. 145: 77–85.
  5. ^ Abouna, Sylvie; Gonzalez-Rizzo, Silvina; Grimonprez, Adrien; Gros, Olivier (2015-05-26). "First Description of Sulphur-Oxidizing Bacterial Symbiosis in a Cnidarian (Medusozoa) Living in Sulphidic Shallow-Water Environments". PLOS ONE. 10 (5): e0127625. doi:10.1371/journal.pone.0127625. ISSN 1932-6203.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  6. ^ a b Taylor, John D.; Glover, Emily A. (2010). The Vent and Seep Biota. Topics in Geobiology. Springer, Dordrecht. pp. 107–135. doi:10.1007/978-90-481-9572-5_5. ISBN 9789048195718.
  7. ^ a b Polz, M. F.; Cavanaugh, C. M. (1995-08-01). "Dominance of one bacterial phylotype at a Mid-Atlantic Ridge hydrothermal vent site". Proceedings of the National Academy of Sciences of the United States of America. 92 (16): 7232–7236. ISSN 0027-8424. PMID 7543678.
  8. ^ Gruber-Vodicka, Harald Ronald; Dirks, Ulrich; Leisch, Nikolaus; Baranyi, Christian; Stoecker, Kilian; Bulgheresi, Silvia; Heindl, Niels Robert; Horn, Matthias; Lott, Christian (2011-07-19). "Paracatenula, an ancient symbiosis between thiotrophic Alphaproteobacteria and catenulid flatworms". Proceedings of the National Academy of Sciences of the United States of America. 108 (29): 12078–12083. doi:10.1073/pnas.1105347108. ISSN 1091-6490. PMC 3141929. PMID 21709249.{{cite journal}}: CS1 maint: PMC format (link)
  9. ^ a b DeChaine, Eric G.; Cavanaugh, Colleen M. (2005). Molecular Basis of Symbiosis. Progress in Molecular and Subcellular Biology. Springer, Berlin, Heidelberg. pp. 227–249. doi:10.1007/3-540-28221-1_11. ISBN 3540282211.
  10. ^ Petersen, Jillian M.; Dubilier, Nicole (2009-10-01). "Methanotrophic symbioses in marine invertebrates". Environmental Microbiology Reports. 1 (5): 319–335. doi:10.1111/j.1758-2229.2009.00081.x. ISSN 1758-2229.
  11. ^ Parte, A.C. "Names included in the category Candidatus". www.bacterio.net. Retrieved 2017-10-26.
  12. ^ Robidart, Julie C.; Bench, Shellie R.; Feldman, Robert A.; Novoradovsky, Alexey; Podell, Sheila B.; Gaasterland, Terry; Allen, Eric E.; Felbeck, Horst (2008-03-01). "Metabolic versatility of the Riftia pachyptila endosymbiont revealed through metagenomics". Environmental Microbiology. 10 (3): 727–737. doi:10.1111/j.1462-2920.2007.01496.x. ISSN 1462-2920.
  13. ^ Gruber-Vodicka, Harald Ronald; Dirks, Ulrich; Leisch, Nikolaus; Baranyi, Christian; Stoecker, Kilian; Bulgheresi, Silvia; Heindl, Niels Robert; Horn, Matthias; Lott, Christian (2011-07-19). "Paracatenula, an ancient symbiosis between thiotrophic Alphaproteobacteria and catenulid flatworms". Proceedings of the National Academy of Sciences of the United States of America. 108 (29): 12078–12083. doi:10.1073/pnas.1105347108. ISSN 1091-6490. PMC 3141929. PMID 21709249.{{cite journal}}: CS1 maint: PMC format (link)
  14. ^ Newton, I. L. G.; Woyke, T.; Auchtung, T. A.; Dilly, G. F.; Dutton, R. J.; Fisher, M. C.; Fontanez, K. M.; Lau, E.; Stewart, F. J. (2007-02-16). "The Calyptogena magnifica Chemoautotrophic Symbiont Genome". Science. 315 (5814): 998–1000. doi:10.1126/science.1138438. ISSN 0036-8075. PMID 17303757.
  15. ^ Rinke, Christian; Schmitz-Esser, Stephan; Stoecker, Kilian; Nussbaumer, Andrea D.; Molnár, Dávid A.; Vanura, Katrina; Wagner, Michael; Horn, Matthias; Ott, Jörg A. (2006-03-01). ""Candidatus Thiobios zoothamnicoli," an Ectosymbiotic Bacterium Covering the Giant Marine Ciliate Zoothamnium niveum". Applied and Environmental Microbiology. 72 (3): 2014–2021. doi:10.1128/aem.72.3.2014-2021.2006. ISSN 0099-2240. PMID 16517650.
  16. ^ Kuwahara, Hirokazu; Yoshida, Takao; Takaki, Yoshihiro; Shimamura, Shigeru; Nishi, Shinro; Harada, Maiko; Matsuyama, Kazuyo; Takishita, Kiyotaka; Kawato, Masaru. "Reduced Genome of the Thioautotrophic Intracellular Symbiont in a Deep-Sea Clam, Calyptogena okutanii". Current Biology. 17 (10): 881–886. doi:10.1016/j.cub.2007.04.039.
  17. ^ Duperron, Sébastien; Nadalig, Thierry; Caprais, Jean-Claude; Sibuet, Myriam; Fiala-Médioni, Aline; Amann, Rudolf; Dubilier, Nicole (April 2005). "Dual symbiosis in a Bathymodiolus sp. mussel from a methane seep on the Gabon continental margin (Southeast Atlantic): 16S rRNA phylogeny and distribution of the symbionts in gills". Applied and Environmental Microbiology. 71 (4): 1694–1700. doi:10.1128/AEM.71.4.1694-1700.2005. ISSN 0099-2240. PMC 1082522. PMID 15811991.{{cite journal}}: CS1 maint: PMC format (link)
  18. ^ Distel, D. L.; Lee, H. K.; Cavanaugh, C. M. (1995-10-10). "Intracellular coexistence of methano- and thioautotrophic bacteria in a hydrothermal vent mussel". Proceedings of the National Academy of Sciences of the United States of America. 92 (21): 9598–9602. ISSN 0027-8424. PMID 7568180.
  19. ^ Woyke, Tanja; Teeling, Hanno; Ivanova, Natalia N.; Huntemann, Marcel; Richter, Michael; Gloeckner, Frank Oliver; Boffelli, Dario; Anderson, Iain J.; Barry, Kerrie W. (2006-10-26). "Symbiosis insights through metagenomic analysis of a microbial consortium". Nature. 443 (7114): 950–955. doi:10.1038/nature05192. ISSN 1476-4687. PMID 16980956.
  20. ^ a b Bright, Monika; Lallier, François H. (2010). "The biology of vestimentiferan tubeworms". Oceanography and marine biology: An annual review. 48: 213–266.
  21. ^ Stewart, Frank J.; Cavanaugh, Colleen M. (2006-11-01). "Bacterial endosymbioses in Solemya (Mollusca: Bivalvia)—Model systems for studies of symbiont–host adaptation". Antonie van Leeuwenhoek. 90 (4): 343–360. doi:10.1007/s10482-006-9086-6. ISSN 0003-6072.
  22. ^ Polz, Martin F.; Felbeck, Horst; Novak, Rudolf; Nebelsick, Monika; Ott, Jörg A. (1992-11-01). "Chemoautotrophic, sulfur-oxidizing symbiotic bacteria on marine nematodes: Morphological and biochemical characterization". Microbial Ecology. 24 (3): 313–329. doi:10.1007/bf00167789. ISSN 0095-3628.
  23. ^ Petersen, Jillian M.; Zielinski, Frank U.; Pape, Thomas; Seifert, Richard; Moraru, Cristina; Amann, Rudolf; Hourdez, Stephane; Girguis, Peter R.; Wankel, Scott D. (2011-08-10). "Hydrogen is an energy source for hydrothermal vent symbioses". Nature. 476 (7359): 176–180. doi:10.1038/nature10325. ISSN 1476-4687. PMID 21833083.
  24. ^ Kleiner, Manuel; Wentrup, Cecilia; Holler, Thomas; Lavik, Gaute; Harder, Jens; Lott, Christian; Littmann, Sten; Kuypers, Marcel M. M.; Dubilier, Nicole (December 2015). "Use of carbon monoxide and hydrogen by a bacteria-animal symbiosis from seagrass sediments". Environmental Microbiology. 17 (12): 5023–5035. doi:10.1111/1462-2920.12912. ISSN 1462-2920. PMC 4744751. PMID 26013766.{{cite journal}}: CS1 maint: PMC format (link)
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  26. ^ Buchanan, Bob B.; Sirevåg, Reidun; Fuchs, Georg; Ivanovsky, Ruslan N.; Igarashi, Yasuo; Ishii, Masaharu; Tabita, F. Robert; Berg, Ivan A. (November 2017). "The Arnon-Buchanan cycle: a retrospective, 1966-2016". Photosynthesis Research. 134 (2): 117–131. doi:10.1007/s11120-017-0429-0. ISSN 1573-5079. PMID 29019085.

Further reading[edit]

[[Category:Chemosynthetic symbiosis]]

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