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Molecular Biogeochemistry, Lecture 8 12.158 Lecture Pigment-derived Biomarkers (1) Colour, structure, distribution and function (2) Biosynthesis (3) Nomenclature (4) Aromatic carotenoids ● Biomarkers for phototrophic sulfur bacteria ● Alternative biological sources (5) Porphyrins and maleimides Many of the figures in this lecture were kindly provided by Jochen Brocks, RSES ANU 1 Carotenoid pigments ● Carotenoids are usually yellow, orange or red coloured pigments lutein β-carotene 17 18 19 2' 2 4 6 8 3 7 9 16 1 5 lycopenelycopene 2 Structural diversity ● More than 600 different natural structures are known, ● They are derived from the C40 carotenoid lycopene by varied hydrogenation, dehydrogenation, cyclization and oxidation reaction 17 18 19 2' 2 4 6 8 3 7 9 16 1 5 lycopene neurosporene α-carotene γ -carotene spirilloxanthin siphonaxanthin canthaxanthin spheroidenone 3 Structural diversity Purple non-sulfur bacteria peridinin 7,8-didehydroastaxanthin okenone fucoxanthin Biological distribution ● Carotenoids are biosynthesized de novo by all phototrophic bacteria, eukaryotes and halophilic archaea ● They are additionally synthesized by a large variety of non-phototrophs ● Vertebrates and invertebrates have to incorporate carotenoids through the diet, but have often the capacity to structurally modifiy them 4 Carotenoid function (1) Accessory pigments in Light Harvesting Complex (LHC) (annual production by marine phytoplancton alone: 4 million tons) e.g. LH-II Red and blue: protein complex Green: chlorophyll Yellow: lycopene (2) Photoprotection (3) photoreceptors for phototropism and phototaxis Halobacteria in a saltern (carotenoid bacterioruberin) (4) Coloration of plants, fungi and animals (5) Vision 5 6 Carotenoid nomenclature (1) Numbering 20 15 15’ (2) The greek alphabet of hydrocarbon endgroups β,Ψ-carotene (γ-carotene) β β , -carotene (β-carotene) β,ε-carotene (α-carotene) 7 Aromatic Carotenoids 6 1 3 2 isorenieratane chlorobactane 2 3 4 okenane Arylisoprenoids 2,3,6-trimethyl- 2,3,4-trimethyl 8 Arylisoprenoids C19 C C 21 C24 m/z = 133 16 C12, C17, C23, C28, C33 C fragments are not possible C18 22 C20 Monitoring of m/z = 133.1 and 134.1 in GC-MS SIR 9 Aryl isoprenoids present in 7 samples from 4 wells at the H. parvus level of the Montney Fm 100 ABR016 Chevron Crooked Creek 3500ft Aromatic hydrocarbons RI m/z 134.00 isorenieratane β- isorenieratane 20.00 40.00 60.00 80.00 100.00 10 Identification of Isorenieratane in Hovea-3 This image has been removed due to copyright restrictions. Isorenieratane indicative of brown pigmented Green Sulfur Bacteria & H2S 20 -100m from surface Identical Series of Arylisoprenoids and Isorenieratane in Core and Outcrop from Meishan Grice K., Cao C., Bőttcher M.E., Twitchett R.J., Grosjean E., Summons R.E., Turgeon S.C, Dunning W. and Jin Y., 2005. Anaerobic Photosynthesis in an Early Triassic Sea: Sluggish Ocean Circulation in a Greenhouse World. Science 307, 706-709. 11 12 Biogeochemical Proxies at Hovea-3 ppm TOC ppm TOC ppm x 1000 ‰ ‰ mm 0 20 40 0 45 90 0 2.5 5 0 0.4 0.8 -6 0 -4 0 -2 0 -2-3 0 6 -3 1 -2 6 00 100 50 100 1965 1965 A) B) C) C) D) D) E)E) F) G) G) 1970 1970 1975 1975 depthmetresdepthmetres 1980 1980 Changhsingian 1985 1985 1990 1990 C18 C19 V=O V=O Pristane C20 NiNi Phytane 1995 1995 δ34 13 IsorenierataneAryl isoprenoidsPorphyrins (FeD+Fep)/FeT Spyrite δ C Claraia size (mm) 12 Saturated hydrocarbon fraction of the Barney Creek Fm. δ13 TIC� lycopane n-alkanes ( C = -30 to -31‰) Ph B03065S acyclic isoprenoids (δ13C[Pr, Ph] ≈ -32‰) Pr β-carotane squalane lycopane i25 γ-carotane C40i31 carotenoids β-carotane i15 n-C30 n-C12 UCM Baseline MSD; B03065S 20 30 40 50 60 70 80 90 min 13 Arylisoprenoids in the Barney Creek Formation 2,3,6-trimethyl­ 2,3,4-trimethyl SIR� 22 18 m/z = 134.1 C22 C18 ● 16 24 ● ● ● ● 17 27 ● 23 ● 28 29 32 33 ● 34 C ● 1 40 5 2 3 4 20 30 40 50 60 min 14 C40 Arylisoprenoids 1 3 chlorobactane isorenieratane 4 2 renieratane okenane 5 renierapurpurane 5 1 M+ = 554.5 2 M+ = 546.5 4 3 m/z = 134.1 50 60 min 15 Animals Eucarya Flagellates Microsporidia Plants Fungi Ciliates Slime moulds Diplomonads Bacteria Green non-sulfur bacteria Okenane Gram positive Sulfolobus bacteria Desulfurococcus Purple sulfur bacteria Thermotoga Thermoproteus Pyrodictium Archaea 1.6 Ga Pyrobaculum Cyanobacteria Pyrococcus Methanobacterium Green sulfur Thermoplasma Chlorobactane bacteria Archaeoglobus 1.6 Ga Methanopyrus Halobacterium Methanococcus Isorenieratane Aquifex Methanosarcina rRNA tree modified after Woese 16 Green sulfur bacteria Chlorobiaceae hν Anoxygenic photosynthesis H2S + CO2 O2 ν Green-pigmented h Chlorobiaceae H2S 20 m Brown-pigmented SO 2- Chlorobiaceae 4 + C org 100 m ● require reduced sulfur ● require light sediment ● strictly anaerobic 17 Green sulfur bacteria Chlorobiaceae hν Biomarkers of Chlorobiaceae O2 Green-pigmented Chlorobiaceae H S chlorobactane 2 20 m Brown-pigmented Chlorobiaceae isorenieratane 100 m sediment Summons et at., 1987 18 Green sulfur bacteria Chlorobiaceae hν Summons et at., 1987 Carbon fixation follows the reversed TCA Cycle O2 Green-pigmented Chlorobiaceae chlorobactane H S 2 20 m Brown-pigmented Chlorobiaceae isorenieratane 100 m � Biomarkers are enriched in 13C by ~10‰ relative to oxygenic sediment phototrophs with the same CO2 source 19 Purple sulfur bacteria Family: Chromatiaceae hν (γ-subgroup of Proteobacteria) Similar requirements to Chlorobiaceae O2 Purple sulfur bacteria ● reduced sulfur 12 m ● light H S Green sulfur bacteria 2 20 m ● anoxic conditions 20 Purple sulfur bacteria Family: Chromatiaceae hν (γ-subgroup of Proteobacteria) O2 Purple sulfur bacteria 12 m H S Green sulfur bacteria 2 20 m O OMe okenone okenane 21 Purple sulfur bacteria hν Chromatiaceae As in oxygenic phototrophs, O carbon fixation follows the 2 Calvin Cycle Purple sulfur bacteria Hower, isotopically light CO2 12 m sources might be utilized Green sulfur bacteria H2S 20 m � Biomass is commonly somewhat depleted in 13C relative to oxygenic phototrophs. CO2 22 Interpretations: okenane hν O O Me Okenone max. ~20 m O2 Purple sulfur Purplebacteria sulfur bacteria H2S Okenane Okenane is a new (and the first!) biomarker for purple sulfur bacteria 23 Interpretations: Okenane hν max. ~20 m Okenane O2 Purple sulfur The Barney Creek Formation bacteria H S was deposited in an extremely 2 euxinic basin The oxic-anoxic boundary was – at least episodically – less than 20 m below the water surface 24 Chlorobactane & Isorenieratane hν max. ~20 m Chlorobactane O2 Purple sulfur bacteria H S Green-pigmented Isorenieratane 2 Chlorobiaceae Brown-pigmented Chlorobiaceae Layers below Chromatiaceae were inhabited by Chlorobiaceae Carbon isotopic data is required to confirm this interpretation 25 Aromatic carotenoids in Lake Cadagno, Schweiz Schaeffer et al. (1997), Tetrahedron Lett., 38, p.8413-16 The lake is meromictic, i.e. permanently stratified Carbon isotopic measurement of hydrogenated extracts from the lake sediment Isorenieratane -27‰ Chlorobactane -28‰ β-Isorenieratane -27‰ Okenane -45‰ β-Renieratane -42‰ � Biomass of Chlorobiaceae and Chromatiaceae might be both strongly depleted in 13C by assimilation of CO2 sourced in remineralized OM The lake is 850x430x21m size; meromictic with sufate rich botom waters from leached host rocks & topeed with freshwater; 6 month ice covered at 1920m altitude (Behrens et al (2000) GCA, 64, 3327) 26 Restricted utility of arylisoprenoids North Sea oil This image has been removed due to copyright restrictions. β-isorenieratane Koopmans et at., GCA, 2003 isorenieratane 27 Restricted utility of arylisoprenoids Koopmans et al., GCA, 2003 Laboratory generation of β-isorenieratane by partial hydrogenation with PtO2/H2 and subsequent dehydrogenation with 2,3­ dichloro-5,6-dicyano-1,4-benzoquinone Q: Is this a realistic simulation of a This image has been removed due to copyright restrictions. natural processes? Q: Is there an alternative explanation for the isotopic values in the North Sea oil? How could you test it? Q: Could okenane be generated this way starting with γ-carotene? β-isorenieratene 28 Alternative sources of arylisoprenoids Mediteranean sapropel This image has been removed due to copyright restrictions. Hopmans, Rijpstra, Rohling, Cane, Sinninghe Damste (2003) IMOG Poster ! Isorenieratene also occurs in actinomycetes ( Mycobacterium, Streptomyces). Q: What is the prefered habitat of actinomycetes? Using this additional bit of information, give an alternative explanation for the above data. Q: How could you test the new hypothesis? 29 Alternative sources of arylisoprenoids A variety of aromatic carotenoids also accurs in sponges: isorenieratene, β-isorenieratene, renieratene, renierapurpurine This image has been removed due to copyright restrictions. β-isorenieratene renieratene Reniera fulva (Orangener Polsterschwamm) renierapurpurine Q: What are the possible biosynthetic sources of these carotenoids? Q: How could you test what the source is? 30 Courtesy Elsevier, Inc., http://www.sciencedirect.com. Used with permission. 31 Porphyrins Porphyrins are a ubiquitous class of naturally occurring compounds with many important biological representatives including hemes, chlorophylls, and several others. There are additionally a multitude of synthetic porphyrinoid molecules that have been prepared for purposes ranging from basic research to functional applications in society. All of these molecules share in common the porphyrin macrocyclic substructure. The basic structure of the porphyrin macrocycle consists of four pyrrolic subunits linked by four methine
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