Chemistry:Isorenieratene

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Isorenieratene
Skeletal formula
Space-filling model
Names
IUPAC name
φ,φ-Carotene
Systematic IUPAC name
1,2,4-trimethyl-3-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-(2,3,6-trimethylphenyl)octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]benzene
Identifiers
3D model (JSmol)
ChemSpider
KEGG
UNII
Properties
C40H48
Molar mass 528.824 g·mol−1
Appearance purple-red crystalline solid
Melting point 199 to 200 °C (390 to 392 °F; 472 to 473 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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Isorenieratene /ˌaɪsoʊrəˈnɪərətiːn/ is a carotenoid light harvesting pigment produced exclusively by the genus Chlorobium. Chlorobium are the brown-colored strains of the family of green sulfur bacteria (Chlorobiaceae).[1] Green sulfur bacteria are anaerobic photoautotrophic organisms meaning they perform photosynthesis in the absence of oxygen using hydrogen sulfide in the following reaction:

H
2S + CO
2 → SO
42-
 + organic compounds

Such anoxygenic photosynthesis requires reduced sulfur and light; thus, this metabolism only occurs in strictly photic and euxinic environments. Therefore, the discovery of isorenieratene and its derivatives in sediments and rocks are helpful biomarkers to identify euxinic water columns in the photic zone.[2]


Structure

Isorenieratene is a carotenoid light-harvesting pigment with the chemical formula [math]\ce{ C40H48 }[/math].[3]

Isorenieratene is a diaromatic carotenoid with a regularly linked isoprenoid chain, except for a single tail-to-tail linkage in the middle of the molecule. Isorenieratene has a characteristic 1-alkyl-2,3,6-trimethyl substitution pattern on the aromatic rings and helps identify the molecule. The nine conjugated double bonds on the isoprenoid backbone are all in the trans configuration and make the molecule highly reactive with reduced inorganic sulfur species.[4] The molecule is hydrophobic and insoluble in water, like most other carotenoids. Isorenieratene is generally non-toxic.

Biological Sources

Isorenieratene was first discovered when isolated from the orange-colored sponge Reniera japonica.[5] Marine sponges are brilliantly colored due to the occurrence of several carotenoids and their association with symbionts such as bacteria or algae. Therefore, isorenieratene in sponges is assumed to originate from the symbiosis between sponges and green sulfur bacteria.[6]

Green sulfur bacteria (Chlorobiaceae) live in euxinic environments, often at the chemocline, where the light flux is present but low. To increase their metabolic efficiency, they have developed a chlorosome, a membrane-bound antenna with bacteriochlorophyll c, d, or e.[7] The brown-colored strain of Chlorobiaceae has bacteriochlorophyll e in its chlorosome, which primarily makes isorenieratene. It is speculated that isorenieratene and other related carotenoids are adaptations that help organisms live under low light conditions.[7] Green sulfur bacteria fix carbon through the reverse tricarboxylic acid cycle (TCA), resulting in the produced biomass, including isorenieratene, being anomalously enriched in Carbon-13 ([math]\ce{ ^{13}C }[/math]) compared to other algal biomass by about 15 per mil.[8] [math]\ce{ \delta^{13}C }[/math] of green sulfur bacteria biomass range between -9 and -21 per mil. Isorenieratene is relatively uncommon but of great significance when encountered. It is a powerful proxy for euxinic conditions in the photic zone both today and in the geologic record.

Environmental distribution

The Black Sea is the largest anoxic body of water on Earth today and home to many green sulfur bacteria colonies.

The combination of conditions in which green sulfur bacteria live and, thereby, where isorenieratene is found are limited today. Most of these locations are restricted water basins with highly stratified waters, allowing for anoxia development in the lower layers and H2S accumulation. The Black Sea is one such water basin where the hydrogen sulfide interface, or the chemocline, has moved up in the photic zone, and high concentrations of green sulfur bacteria and isorenieratene are found.[9] Other modern-day environments include meromictic lakes, restricted fjords, and some marine settings. Green sulfur bacteria are found to play a role in coral ecosystems and have been documented to live on coral and sponges as possible symbionts.[10]

Several cases have been found where green sulfur bacteria with bacteriochlorophyll e are abundant, but no isorenieratene was documented. Green sulfur bacteria were found to live near a deep-sea hydrothermal vent off the coast of Mexico.[11] However, the bacteria are no longer doing photosynthesis at this depth, and no isorenieratene was isolated. In Fayetteville Green Lake (New York), green sulfur bacteria and bacteriochlorophyll e were abundant below the chemocline, yet the sediments lacked isorenieratene.[12] These unexpected absences of isorenieratene call for continued exploration of the microbial ecology of biomarker production in modern environments.

Preservation and measurement

Isorenieratene is generally poorly preserved because its structure is susceptible to alteration and degradation. Upon diagenesis and catagenesis, isorenieratene may be transformed and produce various related products that still indicate photic zone euxinia in the depositional environment.[13] The two main transformation processes are the saturation of double bonds to form isorenieratane and the rupture of the carbon chain resulting in smaller molecular fragments. Other alterations include sulphurization, cyclization, and aromatization.[13]

Use as a biomarker

Occurrence of euxinic waters in early Earth history

While euxinic conditions are rare today, In the early history of the Earth, these conditions were thought to be present in all oceans at depths of about 100 m (330 ft). The detection of isorenieratene and green sulfur bacteria in the mid-Proterozoic has been used as evidence for the long-term euxinic conditions remaining in oceans after the Great Oxygenation Event. For example, the 1.64 Gyr-old Barney Creek Formation in northern Australia hosts many biomarkers, including isorenieratene, that signify these rocks were deposited in a marine basin with anoxic, sulphidic, and highly stratified deep waters with colonies of green and purple sulfur bacteria.[14]

Isorenieratene derivatives have been identified in sedimentary rocks throughout the Paleozoic and Mesozoic, signifying that anoxygenic photosynthesis was a more common process in the past.[15] Isorenieratene derivatives have also been isolated from many petroleum source rocks, suggesting euxinic conditions and anoxia are favorable for preserving organic matter, leading to forming of petroleum reservoirs.[15] Additionally, the detection of isorenieratene derivatives during mass extinctions signifies that euxinic conditions may be common at such events. For example, the isolation of isorenieratene from rock units deposited during the Permian/Triassic Mass extinction, the deadliest mass extinction on Earth, was used as evidence for several pulses of widespread photic zone euxinia leading up to and during the extinction event.[16]

See also

References

  1. ↑ Sinninghe Damsté, Jaap S; Schouten, Stefan; van Duin, Adri C. T (2001-05-15). "Isorenieratene derivatives in sediments: possible controls on their distribution" (in en). Geochimica et Cosmochimica Acta 65 (10): 1557–1571. doi:10.1016/S0016-7037(01)00549-X. ISSN 0016-7037. Bibcode: 2001GeCoA..65.1557S. https://www.sciencedirect.com/science/article/pii/S001670370100549X. 
  2. ↑ Koopmans, Martin P.; Köster, Jürgen; Van Kaam-Peters, Heidy M. E.; Kenig, Fabien; Schouten, Stefan; Hartgers, Walter A.; de Leeuw, Jan W.; Sinninghe Damsté, Jaap S. (1996-11-01). "Diagenetic and catagenetic products of isorenieratene: Molecular indicators for photic zone anoxia" (in en). Geochimica et Cosmochimica Acta 60 (22): 4467–4496. doi:10.1016/S0016-7037(96)00238-4. ISSN 0016-7037. Bibcode: 1996GeCoA..60.4467K. https://www.sciencedirect.com/science/article/pii/S0016703796002384. 
  3. ↑ Yamaguchi, Masaru (1957-09-04). "Chemical Constitution of Isorenieratene" (in en). Bulletin of the Chemical Society of Japan 31 (1): 51–55. doi:10.1246/bcsj.31.51. ISSN 0009-2673. 
  4. ↑ Koopmans, Martin P.; Köster, Jürgen; Van Kaam-Peters, Heidy M. E.; Kenig, Fabien; Schouten, Stefan; Hartgers, Walter A.; de Leeuw, Jan W.; Sinninghe Damsté, Jaap S. (1996-11-01). "Diagenetic and catagenetic products of isorenieratene: Molecular indicators for photic zone anoxia" (in en). Geochimica et Cosmochimica Acta 60 (22): 4467–4496. doi:10.1016/S0016-7037(96)00238-4. ISSN 0016-7037. Bibcode: 1996GeCoA..60.4467K. https://www.sciencedirect.com/science/article/pii/S0016703796002384. 
  5. ↑ Yamaguchi, Masaru (1957-09-04). "Chemical Constitution of Isorenieratene" (in en). Bulletin of the Chemical Society of Japan 31 (1): 51–55. doi:10.1246/bcsj.31.51. ISSN 0009-2673. 
  6. ↑ Genç, Yasin; Bardakci, Hilal; Yücel, Çiğdem; Karatoprak, Gökçe Şeker; Küpeli Akkol, Esra; Hakan Barak, Timur; Sobarzo-Sánchez, Eduardo (2020-06-27). "Oxidative Stress and Marine Carotenoids: Application by Using Nanoformulations" (in en). Marine Drugs 18 (8): 423. doi:10.3390/md18080423. ISSN 1660-3397. PMID 32823595. 
  7. ↑ 7.0 7.1 Maresca, Julia A.; Romberger, Steven P.; Bryant, Donald A. (2008-05-28). "Isorenieratene Biosynthesis in Green Sulfur Bacteria Requires the Cooperative Actions of Two Carotenoid Cyclases" (in en). Journal of Bacteriology 190 (19): 6384–6391. doi:10.1128/JB.00758-08. ISSN 0021-9193. PMID 18676669. 
  8. ↑ Koopmans, Martin P.; Köster, Jürgen; Van Kaam-Peters, Heidy M. E.; Kenig, Fabien; Schouten, Stefan; Hartgers, Walter A.; de Leeuw, Jan W.; Sinninghe Damsté, Jaap S. (1996-11-01). "Diagenetic and catagenetic products of isorenieratene: Molecular indicators for photic zone anoxia" (in en). Geochimica et Cosmochimica Acta 60 (22): 4467–4496. doi:10.1016/S0016-7037(96)00238-4. ISSN 0016-7037. Bibcode: 1996GeCoA..60.4467K. https://www.sciencedirect.com/science/article/pii/S0016703796002384. 
  9. ↑ Marschall, Evelyn; Jogler, Mareike; Henßge, Uta; Overmann, Jörg (2010-03-09). "Large-scale distribution and activity patterns of an extremely low-light-adapted population of green sulfur bacteria in the Black Sea: Green sulfur bacteria in the Black Sea" (in en). Environmental Microbiology 12 (5): 1348–1362. doi:10.1111/j.1462-2920.2010.02178.x. PMID 20236170. https://onlinelibrary.wiley.com/doi/10.1111/j.1462-2920.2010.02178.x. 
  10. ↑ Yang, Shan-Hua; Lee, Sonny T. M.; Huang, Chang-Rung; Tseng, Ching-Hung; Chiang, Pei-Wen; Chen, Chung-Pin; Chen, Hsing-Ju; Tang, Sen-Lin (2016-02-26). "Prevalence of potential nitrogen-fixing, green sulfur bacteria in the skeleton of reef-building coral Isopora palifera: Endolithic bacteria in coral skeletons" (in en). Limnology and Oceanography 61 (3): 1078–1086. doi:10.1002/lno.10277. 
  11. ↑ Beatty, J. Thomas; Overmann, Jörg; Lince, Michael T.; Manske, Ann K.; Lang, Andrew S.; Blankenship, Robert E.; Van Dover, Cindy L.; Martinson, Tracey A. et al. (2005-06-28). "An obligately photosynthetic bacterial anaerobe from a deep-sea hydrothermal vent" (in en). Proceedings of the National Academy of Sciences 102 (26): 9306–9310. doi:10.1073/pnas.0503674102. ISSN 0027-8424. PMID 15967984. Bibcode: 2005PNAS..102.9306B. 
  12. ↑ Meyer, K. M.; Macalady, J. L.; Fulton, J. M.; Kump, L. R.; Schaperdoth, I.; Freeman, K. H. (2011-06-20). "Carotenoid biomarkers as an imperfect reflection of the anoxygenic phototrophic community in meromictic Fayetteville Green Lake: Biomarkers of anoxygenic phototrophs" (in en). Geobiology 9 (4): 321–329. doi:10.1111/j.1472-4669.2011.00285.x. PMID 21682840. https://onlinelibrary.wiley.com/doi/10.1111/j.1472-4669.2011.00285.x. 
  13. ↑ 13.0 13.1 Koopmans, Martin P.; Köster, Jürgen; Van Kaam-Peters, Heidy M. E.; Kenig, Fabien; Schouten, Stefan; Hartgers, Walter A.; de Leeuw, Jan W.; Sinninghe Damsté, Jaap S. (1996-11-01). "Diagenetic and catagenetic products of isorenieratene: Molecular indicators for photic zone anoxia" (in en). Geochimica et Cosmochimica Acta 60 (22): 4467–4496. doi:10.1016/S0016-7037(96)00238-4. ISSN 0016-7037. Bibcode: 1996GeCoA..60.4467K. https://www.sciencedirect.com/science/article/pii/S0016703796002384. 
  14. ↑ Brocks, Jochen J.; Love, Gordon D.; Summons, Roger E.; Knoll, Andrew H.; Logan, Graham A.; Bowden, Stephen A. (2005-10-06). "Biomarker evidence for green and purple sulphur bacteria in a stratified Palaeoproterozoic sea" (in en). Nature 437 (7060): 866–870. doi:10.1038/nature04068. ISSN 1476-4687. PMID 16208367. Bibcode: 2005Natur.437..866B. https://www.nature.com/articles/nature04068. 
  15. ↑ 15.0 15.1 Koopmans, Martin P.; Köster, Jürgen; Van Kaam-Peters, Heidy M. E.; Kenig, Fabien; Schouten, Stefan; Hartgers, Walter A.; de Leeuw, Jan W.; Sinninghe Damsté, Jaap S. (1996-11-01). "Diagenetic and catagenetic products of isorenieratene: Molecular indicators for photic zone anoxia" (in en). Geochimica et Cosmochimica Acta 60 (22): 4467–4496. doi:10.1016/S0016-7037(96)00238-4. ISSN 0016-7037. Bibcode: 1996GeCoA..60.4467K. https://www.sciencedirect.com/science/article/pii/S0016703796002384. 
  16. ↑ Nabbefeld, Birgit; Grice, Kliti; Twitchett, Richard J.; Summons, Roger E.; Hays, Lindsay; Böttcher, Michael E.; Asif, Muhammad (2010-03-01). "An integrated biomarker, isotopic and palaeoenvironmental study through the Late Permian event at Lusitaniadalen, Spitsbergen" (in en). Earth and Planetary Science Letters 291 (1): 84–96. doi:10.1016/j.epsl.2009.12.053. ISSN 0012-821X. Bibcode: 2010E&PSL.291...84N. https://www.sciencedirect.com/science/article/pii/S0012821X10000178. 



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