scholarly journals Alternative pathways for phosphonate metabolism in thermophilic cyanobacteria from microbial mats

2010 ◽  
Vol 5 (1) ◽  
pp. 141-149 ◽  
Author(s):  
Maria R Gomez-Garcia ◽  
Michelle Davison ◽  
Matthew Blain-Hartnung ◽  
Arthur R Grossman ◽  
Devaki Bhaya
Keyword(s):  
Microbial Mats ◽  
Alternative Pathways ◽  
Thermophilic Cyanobacteria

scholarly journals Responses of a Thermophilic Synechococcus Isolate from the Microbial Mat of Octopus Spring to Light

2007 ◽  
Vol 73 (13) ◽  
pp. 4268-4278 ◽  
Author(s):  
Oliver Kilian ◽  
Anne-Soisig Steunou ◽  
Fariba Fazeli ◽  
Shaun Bailey ◽  
Devaki Bhaya ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Microbial Mats ◽  
Carbon Fixation ◽  
Fluorescence Emission ◽  
Transcript Abundance ◽  
High Light ◽  
Microbial Mat ◽  
Fluorescence Emission Spectra ◽  
Thermophilic Cyanobacteria ◽  
Genes Encoding

ABSTRACT Thermophilic cyanobacteria of the genus Synechococcus are major contributors to photosynthetic carbon fixation in the photic zone of microbial mats in Octopus Spring, Yellowstone National Park. Synechococcus OS-B′ was characterized with regard to the ability to acclimate to a range of different light irradiances; it grows well at 25 to 200 μmol photons m−2 s−1 but dies when the irradiance is increased to 400 μmol photons m−2 s−1. At 200 μmol photons m−2 s−1 (high light [HL]), we noted several responses that had previously been associated with HL acclimation of cyanobacteria, including cell bleaching, reduced levels of phycobilisomes and chlorophyll, and elevated levels of a specific carotenoid. Synechococcus OS-B′ synthesizes the carotenoids zeaxanthin and β,β-carotene and a novel myxol-anhydrohexoside. Interestingly, 77-K fluorescence emission spectra suggest that Synechococcus OS-B′ accumulates very small amounts of photosystem II relative to that of photosystem I. This ratio further decreased at higher growth irradiances, which may reflect potential photodamage following exposure to HL. We also noted that HL caused reduced levels of transcripts encoding phycobilisome components, particularly that for CpcH, a 20.5-kDa rod linker polypeptide. There was enhanced transcript abundance of genes encoding terminal oxidases, superoxide dismutase, tocopherol cyclase, and phytoene desaturase. Genes encoding the photosystem II D1:1 and D1:2 isoforms (psbAI and psbAII/psbAIII, respectively) were also regulated according to the light regimen. The results are discussed in the context of how Synechococcus OS-B′ may cope with high light irradiances in the high-temperature environment of the microbial mat.

scholarly journals Analysis of Insertion Sequences in Thermophilic Cyanobacteria: Exploring the Mechanisms of Establishing, Maintaining, and Withstanding High Insertion Sequence Abundance

2011 ◽  
Vol 77 (15) ◽  
pp. 5458-5466 ◽  
Author(s):  
William C. Nelson ◽  
Lori Wollerman ◽  
Devaki Bhaya ◽  
John F. Heidelberg
Keyword(s):  
Microbial Mats ◽  
Hot Spring ◽  
Natural Populations ◽  
Metagenomic Data ◽  
Insertion Sequences ◽  
Content Type ◽  
A Genome ◽  
Thermophilic Cyanobacteria ◽  
Show Evidence ◽  
High Sequence Conservation

ABSTRACTInsertion sequences (ISs) are simple mobile genetic elements capable of relocating within a genome. Through this transposition activity, they are known to create mutations which are mostly deleterious to the cell, although occasionally they are beneficial. Two closely related isolates of thermophilicSynechococcusspecies from hot spring microbial mats are known to harbor a large number of diverse ISs. To explore the mechanism of IS acquisition within natural populations and survival in the face of high IS abundance, we examined IS content and location in natural populations ofSynechococcusby comparing metagenomic data to the genomes of fully sequenced cultured isolates. The observed IS distribution in the metagenome was equivalent to the distribution in the isolates, indicating that the cultured isolates are appropriate models for the environmental population. High sequence conservation between IS families shared between the two isolates suggests that ISs are able to move between individuals within populations and between species via lateral gene transfer, consistent with models for IS family accumulation. Most IS families show evidence of recent activity, and interruption of critical genes in some individuals was observed, demonstrating that transposition is an ongoing mutational force in the populations.

scholarly journals Draft Genome Sequences of Two Cyanobacteria Leptolyngbya spp. Isolated from Microbial Mats in Miravalles Thermal Spring, Costa Rica

2021 ◽  
Vol 10 (41) ◽  
Author(s):  
L. Brenes-Guillén ◽  
D. Vidaurre-Barahona ◽  
M. Mora-López ◽  
L. Uribe-Lorío
Keyword(s):  
Costa Rica ◽  
Microbial Mats ◽  
Draft Genome ◽  
Thermal Spring ◽  
Genome Sequences ◽  
Phototrophic Microorganisms ◽  
Thermophilic Cyanobacteria ◽  
Insight Into

We report the draft genome sequences of Leptolyngbya sp. strain 7M and Leptolyngbya sp. strain 15MV, isolated from Miravalles Thermal Spring, Costa Rica. The thermophilic cyanobacteria exhibit unique diversity features that provide insight into the adaptation and evolution of phototrophic microorganisms in geothermal habitats.

scholarly journals In situanalysis of nitrogen fixation and metabolic switching in unicellular thermophilic cyanobacteria inhabiting hot spring microbial mats

2006 ◽  
Vol 103 (7) ◽  
pp. 2398-2403 ◽  
Author(s):  
Anne-Soisig Steunou ◽  
Devaki Bhaya ◽  
Mary M. Bateson ◽  
Melanie C. Melendrez ◽  
David M. Ward ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Microbial Mats ◽  
Hot Spring ◽  
Metabolic Switching ◽  
Thermophilic Cyanobacteria

Gene expression during two alternative pathways of ovary development in Pisum sativum: fruit development and ovary senescence

1992 ◽  
Vol 85 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Maria-Jose Sanchez-Beltran ◽  
Juan Carbonell ◽  
Jose L. Garcia-Martinez ◽  
Isabel Lopez-Diaz
Keyword(s):  
Gene Expression ◽  
Pisum Sativum ◽  
Fruit Development ◽  
Ovary Development ◽  
Alternative Pathways ◽  
Ovary Senescence

Holocene Intertidal Microbial Mats Of Qatar And Their Implications For Petroleum Source Rock Formation In Carbonate-Siliciclastic-Evaporite Systems

2014 ◽  
Author(s):  
Miroslaw Slowakiewicz ◽  
Richard D. Pancost ◽  
Lisa Thomas ◽  
Maurice E. Tucker ◽  
Sher Mey Didi-Ooi ◽  
...  
Keyword(s):  
Source Rock ◽  
Microbial Mats ◽  
Rock Formation ◽  
Petroleum Source Rock
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