Effect of Iron on Growth and Ultrastructure of
            <i>Acaryochloris marina</i>

Swingley, Wesley D.; Hohmann‐Marriott, Martin F.; Olson, Tien L.; Blankenship, Robert E.

doi:10.1128/aem.71.12.8606-8610.2005

Cited by 33 publications

(32 citation statements)

References 28 publications

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“…The maximum specific growth rate that has been achieved in culture for Acaryochloris is low relative to the rates found for related cyanobacteria of a similar cell size (Swingley et al 2005;Gloag et al 2007). Although growth conditions may not yet have been optimised, it is possible that the low growth rate could be related to the novel photochemistry of this cyanobacterium.…”

Section: Chlorophyll a And Oxygen Productionmentioning

confidence: 82%

Functional evolution of photochemical energy transformations in oxygen-producing organisms

Raven¹

2009

Functional Plant Biol.

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Abstract. Chlorophyll a is the photochemical agent accounting for most oxygenic photosynthesis, that is, over 99.9% of photosynthetic primary activity on Earth. The spectral and energetic properties of chlorophyll a can, at least in part, be rationalised in terms of the solar spectral output and the energetics of oxygen production and carbon dioxide reduction with two photochemical reactions. The long wavelength limit on in vivo chlorophyll a absorption is probably close to the energetic limit: longer wavelengths could not support a high rate and efficiency of oxygenic photosynthesis. Retinal, a b-carotene derivative that is the chromophore of rhodopsin, acts not only as a sensory pigment, but also as an ion-pumping photochemical transducer. Both sensory and energy-transforming rhodopsins occur in oxygenic phototrophs, although the extent of expression and the function of the latter are not well understood.

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Section: Chlorophyll a And Oxygen Productionmentioning

confidence: 82%

Functional evolution of photochemical energy transformations in oxygen-producing organisms

Raven¹

2009

Functional Plant Biol.

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“…The most significant feature of A. marina is its ability to produce Chl d as a major photosynthetic pigment, which accounts for up to 99% of all cellular chlorophyll (28,29). Molecular and biochemical work has yet to identify any candidate ''Chl d synthase'' genes.…”

Section: Resultsmentioning

confidence: 99%

Niche adaptation and genome expansion in the chlorophyll d -producing cyanobacterium Acaryochloris marina

Swingley

Chen

Cheung³

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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201

184

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Acaryochloris marina is a unique cyanobacterium that is able to produce chlorophyll d as its primary photosynthetic pigment and thus efficiently use far-red light for photosynthesis. Acaryochloris species have been isolated from marine environments in association with other oxygenic phototrophs, which may have driven the niche-filling introduction of chlorophyll d. To investigate these unique adaptations, we have sequenced the complete genome of A. marina. The DNA content of A. marina is composed of 8.3 million base pairs, which is among the largest bacterial genomes sequenced thus far. This large array of genomic data is distributed into nine single-copy plasmids that code for >25% of the putative ORFs. Heavy duplication of genes related to DNA repair and recombination (primarily recA) and transposable elements could account for genetic mobility and genome expansion. We discuss points of interest for the biosynthesis of the unusual pigments chlorophyll d and ␣-carotene and genes responsible for previously studied phycobilin aggregates. Our analysis also reveals that A. marina carries a unique complement of genes for these phycobiliproteins in relation to those coding for antenna proteins related to those in Prochlorococcus species. The global replacement of major photosynthetic pigments appears to have incurred only minimal specializations in reaction center proteins to accommodate these alternate pigments. These features clearly show that the genus Acaryochloris is a fitting candidate for understanding genome expansion, gene acquisition, ecological adaptation, and photosystem modification in the cyanobacteria.comparative microbial genomics ͉ photosynthesis ͉ oxygenic phototrophs ͉ evolution

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“…Growth of other, unidentified bacteria was observed in beads imaged with SEM. This was expected, as most A. marina cultures are known to be nonaxenic (32,48). Surprisingly, growth of these unidentified bacteria was only observed in beads kept under visible light and not in those kept under NIR.…”

Section: Discussionmentioning

confidence: 77%

“…In A. marina, Chl a has essentially been displaced by Chl d as the main photosynthetic pigment (10,11,24,34,(48)(49)(50) and its functional role appears more related to Chl d biosynthesis (45) and charge recombination in photosystem II (50). Photoacclimation in the A. marina type strain MBIC11017 appears to be performed through alterations of Chl a/d ratios under high-light (10, 32) and low-light (18,48) conditions, while chromatic photoacclimation in A. marina was reported to involve regulation of its phycobiliprotein content (17). The Chl a/d ratios for immobilized cells grown under NIR were surprisingly similar (in our study, 0.0339) to previously published results (0.0346), where A. marina was grown under red light (18) and 0.0552 at ϳ100 mol photons m Ϫ2 s Ϫ1 ) (18) and were approximately twice as high as those reported in reference 32.…”

Section: Discussionmentioning

confidence: 99%

“…Due to its unique possession of Chl d, such A. marina cultures have been the subject of a number of detailed studies, including studies of its genome (32,47), its basic photophysiology (2,8,49,50), Chl d biosynthesis (45), chromatic photoacclimation (18), pigment composition (1,9), and ultrastructure (28,48). A recent study also demonstrated the presence and activity of N 2 fixation under hypoxic conditions in a culture of the A. marina strain HICR111A (36).…”

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confidence: 99%

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Biofilm Growth and Near-Infrared Radiation-Driven Photosynthesis of the Chlorophyll d -Containing Cyanobacterium Acaryochloris marina

Behrendt

Schrameyer

Qvortrup

et al. 2012

Appl Environ Microbiol

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The cyanobacterium Acaryochloris marina is the only known phototroph harboring chlorophyll (Chl) d. It is easy to cultivate it in a planktonic growth mode, and A. marina cultures have been subject to detailed biochemical and biophysical characterization. In natural situations, A. marina is mainly found associated with surfaces, but this growth mode has not been studied yet. Here, we show that the A. marina type strain MBIC11017 inoculated into alginate beads forms dense biofilm-like cell clusters, as in natural A. marina biofilms, characterized by strong O 2 concentration gradients that change with irradiance. Biofilm growth under both visible radiation (VIS, 400 to 700 nm) and near-infrared radiation (NIR, ϳ700 to 730 nm) yielded maximal cell-specific growth rates of 0.38 per day and 0.64 per day, respectively. The population doubling times were 1.09 and 1.82 days for NIR and visible light, respectively. The photosynthesis versus irradiance curves showed saturation at a photon irradiance of E k (saturating irradiance) >250

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Effect of Iron on Growth and Ultrastructure of Acaryochloris marina

Cited by 33 publications

References 28 publications

Functional evolution of photochemical energy transformations in oxygen-producing organisms

Functional evolution of photochemical energy transformations in oxygen-producing organisms

Niche adaptation and genome expansion in the chlorophyll d -producing cyanobacterium Acaryochloris marina

Biofilm Growth and Near-Infrared Radiation-Driven Photosynthesis of the Chlorophyll d -Containing Cyanobacterium Acaryochloris marina

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