Identification of the major chlorosomal bacteriochlorophylls of the green sulfur bacteria Chlorobium vibrioforme and Chlorobium phaeovibrioides; their function in lateral energy transfer

Otte, Stephan C.M.; Meent, Erik Jan van de; Veelen, Peter A. van; Pundsnes, A. S.; Amesz, J.

doi:10.1007/bf00014746

Cited by 65 publications

(31 citation statements)

References 25 publications

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“…These results illustrate the adaptability of the anoxygenic photosynthetic community to very low incident light levels. Although farnesol is the main alcohol esterifying the bacteriochlorophylls at position C-17, earlier studies have shown that a number of other alcohols are present in natural samples (Caple et al, 1978;Otte et al, 1993) depending on growth conditions, light intensity and stage of development of the cell (Borrego and Garcia-Gil, 1995;Airs et al, 2001b). Massé et al (2004) reported that in cultured Cb.…”

Section: Anoxygenic Photosynthesis In Tillari and Selaulim Reservoirsmentioning

confidence: 99%

Seasonal occurrence of anoxygenic photosynthesis in Tillari and Selaulim reservoirs, Western India

et al. 2012

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Abstract. Phytoplankton and bacterial pigment compositions were determined by high performance liquid chromatography (HPLC) and liquid chromatography-mass spectrometry (LC-MS) in two freshwater reservoirs (Tillari Dam and Selaulim Dam), which are located at the foothills of the Western Ghats in India. These reservoirs experience anoxia in the hypolimnion during summer. Water samples were collected from both reservoirs during anoxic periods while one of them (Tillari Reservoir) was also sampled in winter, when convective mixing results in well-oxygenated conditions throughout the water column. During the period of anoxia (summer), bacteriochlorophyll (BChl) e isomers and isorenieratene, characteristic of brown sulfur bacteria, were dominant in the anoxic (sulfidic) layer of the Tillari Reservoir under low light intensities. The winter observations showed the dominance of small cells of Chlorophyll b-containing green algae and cyanobacteria, with minor presence of fucoxanthin-containing diatoms and peridinin-containing dinoflagellates. Using total BChl e concentration observed in June, the standing stock of brown sulfur bacteria carbon in the anoxic compartment of Tillari Reservoir was estimated to be 2.27 gC m−2, which is much higher than the similar estimate for carbon derived from oxygenic photosynthesis (0.82 gC m−2. The Selaulim Reservoir also displayed similar characteristics with the presence of BChl e isomers and isorenieratene in the anoxic hypolimnion during summer. Although sulfidic conditions prevailed in the water column below the thermocline, the occurrence of photo-autotrophic bacteria was restricted only to mid-depths (maximal concentration of BChl e isomers was detected at 0.2% of the surface incident light). This shows that the vertical distribution of photo-autotrophic sulfur bacteria is primarily controlled by light penetration in the water column where the presence of H2S provides a suitable biogeochemical environment for them to flourish.

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Section: Anoxygenic Photosynthesis In Tillari and Selaulim Reservoirsmentioning

confidence: 99%

Seasonal occurrence of anoxygenic photosynthesis in Tillari and Selaulim reservoirs, Western India

et al. 2012

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“…Our observation is consistent with Pancost et al (2004) which reported methyl isobutyl maleimide, a degradation product of bacteriochlorophylls d and e, in OAE-2 sediments from central Italy and Tunisia. Since both bacteriochlorophylls d and e are restricted to anaerobic green sulfur bacteria (e.g., Otte et al, 1993;Glaeser et al, 2002;Nakajima et al, 2003), the presence of derivatives of these bacteriochlorophylls indicates that at least the base of photic zone was anaerobic at these sites during the OAE-2. This consideration supports previous observations of Sinninghe Damsté and Köster (1998) who reported derivatives of isorenieratene, a carotenoid pigment of green sulfur bacteria in the Bonarelli black shale.…”

Section: Geoporphyrins In Bonarelli Black Shalementioning

confidence: 99%

The importance of diazotrophic cyanobacteria as primary producers during Cretaceous Oceanic Anoxic Event 2

et al. 2006

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Abstract. In Livello Bonarelli black shale deposited during Cretaceous Oceanic Anoxic Event 2 (OAE-2, ca. 94 Ma), nitrogen isotopic compositions of bulk sediments are mostly in a narrow range from -2.7 to -0.7‰. We also determined molecular distribution and nitrogen isotopic compositions of geoporphyrins extracted from the black shale. The nitrogen isotopic compositions of C 32 Ni deoxophylloerythroetioporphyrin (DPEP) and total Ni porphyrins are -3.5 and -3.3‰, respectively, leading us to the estimation that the mean nitrogen isotopic composition of photoautotrophic cells were around +1‰ during the formation of Bonarelli black shale. This value is suggestive of N 2 -fixation, a dominant process for these photoautotrophs when assimilating nitrogen. Furthermore, Ni-chelated C 32 DPEP, derived mainly from chlorophyll a had the highest concentration. Based on this evidence, we conclude that diazotrophic cyanobacteria were major primary producers during that time. Cyanobacteria may be key photoautotrophs during the formation of black shale type sediments intermittently observed throughout the later half of the Earth's history, and hence may have played a crucial role in the evolution of geochemical cycles even in the later half of the Earth's history.

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“…This is considered to affect altered spectral properties by modulating the in vitro aggregation properties of the chromophores. However, structural studies of the demetallated derivatives of the homologues [104] from Chlorobium vibrioforme indicate substantial alterations to the macrocycle conformation, which may contribute to the red-shift of the low-light chlorosomes, although analysis of the spectral properties of the isolated chromophores [262] did not show any systematic variation corresponding to the extent of methylation. Additionally, model compounds have indicated that the C20-methyl substituent induces local nonplanarity at this position, which may contribute to the 10 nm red shift of BChl c relative to BChl d (see Chapter 2.3) [46,96].…”

Section: Bchl Lamellar Sheetsmentioning

confidence: 94%

Chlorophylls, Symmetry, Chirality, and Photosynthesis

et al. 2014

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Chlorophylls are a fundamental class of tetrapyrroles and function as the central reaction center, accessory and photoprotective pigments in photosynthesis. Their unique individual photochemical properties are a consequence of the tetrapyrrole macrocycle, the structural chemistry and coordination behavior of the phytochlorin system, and specific substituent pattern. They achieve their full potential in solar energy conversion by working in concert in highly complex, supramolecular structures such as the reaction centers and light-harvesting complexes of photobiology. The biochemical function of these structures depends on the controlled interplay of structural and functional principles of the apoprotein and pigment cofactors. Chlorophylls and bacteriochlorophylls are optically active molecules with several chiral centers, which are necessary for their natural biological function and the assembly of their supramolecular complexes. However, in many cases the exact role of chromophore stereochemistry in the biological context is unknown. This review gives an overview of chlorophyll research in terms of basic function, biosynthesis and their functional and structural role in photosynthesis. It highlights aspects of chirality and symmetry of chlorophylls to elicit further interest in their role in nature.

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Identification of the major chlorosomal bacteriochlorophylls of the green sulfur bacteria Chlorobium vibrioforme and Chlorobium phaeovibrioides; their function in lateral energy transfer

Cited by 65 publications

References 25 publications

Seasonal occurrence of anoxygenic photosynthesis in Tillari and Selaulim reservoirs, Western India

Seasonal occurrence of anoxygenic photosynthesis in Tillari and Selaulim reservoirs, Western India

The importance of diazotrophic cyanobacteria as primary producers during Cretaceous Oceanic Anoxic Event 2

Chlorophylls, Symmetry, Chirality, and Photosynthesis

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