Abstract:
:Deep fractured rock ecosystems across most of North America have not been studied extensively. However, the US Great Basin, in particular the Nevada National Security Site (NNSS, formerly the Nevada Test Site), has hosted a number of influential subsurface investigations over the years. This investigation focuses on resident microbiota recovered from a hydrogeologically confined aquifer in fractured Paleozoic carbonate rocks at 863 - 923 meters below land surface. Analysis of the microorganisms living in this oligotrophic environment provides a perspective into microbial metabolic strategies required to endure prolonged hydrogeological isolation deep underground. Here we present a microbiological and physicochemical characterization of a deep continental carbonate ecosystem and describe a bacterial genus isolated from the ecosystem. Strain DRI-13T is a strictly anaerobic, moderately thermophilic, fumarate-respiring member of the phylum Firmicutes. This bacterium grows optimally at 55°C and pH 8.0, can tolerate a concentration of 100 mM NaCl, and appears to obligately metabolize fumarate to acetate and succinate. Culture-independent 16S rRNA gene sequencing indicates a global subsurface distribution, while the closest cultured relatives of DRI-13T are Pelotomaculum thermopropionicum (90.0% similarity) and Desulfotomaculum gibsoniae (88.0% similarity). The predominant fatty acid profile is iso-C15:0, C15:0, C16:0 and C14:0. The percentage of the straight-chain fatty acid C15:0 is a defining characteristic not present in the other closely related species. The genome is estimated to be 3,649,665 bp, composed of 87.3% coding regions with an overall average of 45.1% G + C content. Strain DRI-13T represents a novel genus of subsurface bacterium isolated from a previously uncharacterized rock-hosted geothermal habitat. The characterization of the bacterium combined with the sequenced genome provides insights into metabolism strategies of the deep subsurface biosphere. Based on our characterization analysis we propose the name Thermoanaerosceptrum fracticalcis (DRI-13T = DSM 100382T = ATCC TSD-12T).
journal_name
Front Microbioljournal_title
Frontiers in microbiologyauthors
Hamilton-Brehm SD,Stewart LE,Zavarin M,Caldwell M,Lawson PA,Onstott TC,Grzymski J,Neveux I,Lollar BS,Russell CE,Moser DPdoi
10.3389/fmicb.2019.02224subject
Has Abstractpub_date
2019-09-27 00:00:00pages
2224issn
1664-302Xjournal_volume
10pub_type
杂志文章abstract::The High Arctic is dominated by polar desert habitats whose microbial communities are poorly understood. In this study, we used next generation sequencing to describe the α- and β-diversity of microbial communities in polar desert soils from the Kongsfjorden region of Svalbard. Ten phyla dominated the soils and accoun...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2016.00419
更新日期:2016-03-31 00:00:00
abstract::Historically filamentous bacteriophage have been known to be the workhorse of phage display due to their ability to link genotype to phenotype. More recently, the filamentous phage scaffold has proven to be powerful outside the realm of phage display technology in fields such as molecular imaging, cancer research and ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章,评审
doi:10.3389/fmicb.2014.00734
更新日期:2014-12-23 00:00:00
abstract::For tolerating extreme desiccation, cyanobacteria are known to produce both compatible solutes at intracellular level and a copious amount of exopolysaccharides as a protective coat. However, these molecules make cyanobacterial cells refractory to a broad spectrum of cell disruption methods, hindering genome sequencin...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2019.00950
更新日期:2019-05-07 00:00:00
abstract::The purpose of present study was the simulation of an oil spill accompanied by burial of significant amount of petroleum hydrocarbons (PHs) in coastal sediments. Approximately 1000 kg of sediments collected in Messina harbor were spiked with Bunker C furnace fuel oil (6500 ppm). The rapid consumption of oxygen by aero...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2014.00162
更新日期:2014-04-14 00:00:00
abstract::CRISPR-Cas systems adapt "memories" via spacers from viruses and plasmids to develop adaptive immunity against mobile genetic elements. Mature CRISPR RNAs guide CRISPR-associated nucleases to site-specifically cleave target DNA or RNA, providing an efficient genome engineering tool for organisms of all three kingdoms....
journal_title:Frontiers in microbiology
pub_type: 杂志文章,评审
doi:10.3389/fmicb.2019.02471
更新日期:2019-10-25 00:00:00
abstract::The objective of this experiment was to compare ruminal fluid samples collected through rumen cannula (RC) or using an oral stomach tube (ST) for measurement of ruminal fermentation and microbiota variables. Six ruminally cannulated lactating Holstein cows fed a standard diet were used in the study. Rumen samples were...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2020.618032
更新日期:2020-12-23 00:00:00
abstract::The colon is inhabited by a dense population of microorganisms, the so-called "gut microbiota," able to ferment carbohydrates and proteins that escape absorption in the small intestine during digestion. This microbiota produces a wide range of metabolites, including short chain fatty acids (SCFA). These compounds are ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章,评审
doi:10.3389/fmicb.2016.00185
更新日期:2016-02-17 00:00:00
abstract::Nisin, an important bacteriocin from Lactococcus lactis subsp., is primarily active against various Gram-positive bacteria. Leucocin C, produced by Leuconostoc carnosum 4010, is a class IIa bacteriocin used to inhibit the growth of Listeria monocytogenes. Because two bacteriocins have different modes of action, the co...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2018.00547
更新日期:2018-03-23 00:00:00
abstract::Single molecule, real-time (SMRT) sequencing was used to characterize mitochondrial (mt) genome of Ophiocordyceps sinensis and to analyze the mt genome-wide pattern of epigenetic DNA modification. The complete mt genome of O. sinensis, with a size of 157,539 bp, is the fourth largest Ascomycota mt genome sequenced to ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2017.01422
更新日期:2017-07-27 00:00:00
abstract::Low moisture content ready-to-eat foods vended in Nigerian markets could be pre-packaged or packaged at point of sale. These foods are widely and frequently consumed across Nigeria as quick foods. Despite their importance in the daily diets of Nigerians, a comprehensive study on the diversity of fungi, fungal metaboli...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2020.00615
更新日期:2020-04-09 00:00:00
abstract::High dispersal rates are known to homogenize host's population genetic structure in panmictic species and to disrupt host local adaptation to the environment. Long-distance dispersal might also spread micro-organisms across large geographical areas. However, so far, to which extent selection mechanisms that shape host...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2019.00035
更新日期:2019-02-06 00:00:00
abstract::A new method to measure growth rates of individual photoautotrophic cells by combining stable isotope probing (SIP) and single-cell resonance Raman microspectrometry is introduced. This report explores optimal experimental design and the theoretical underpinnings for quantitative responses of Raman spectra to cellular...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2017.01449
更新日期:2017-08-03 00:00:00
abstract::Introduction: Antibiotic resistant bacteria are a growing concern worldwide. Extended-spectrum β-lactamases (ESBL) represent the most common resistance mechanism of Gram-negative bacteria against β-lactams, underlining the need for adequate diagnostic methods that provide reliable information in the shortest time poss...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2019.00013
更新日期:2019-01-24 00:00:00
abstract::Campylobacter as an inhabitant of the poultry gastrointestinal tract has proven to be difficult to reduce with most feed additives. In-feed antibiotics have been taken out of poultry diets due to the negative reactions of consumers along with concerns regarding the generation of antibiotic resistant bacteria. Conseque...
journal_title:Frontiers in microbiology
pub_type: 杂志文章,评审
doi:10.3389/fmicb.2019.00091
更新日期:2019-01-31 00:00:00
abstract::Because of the remarkable efficacy in treating mycobacterial infections, rifamycin and its derivatives are still first-line antimycobacterial drugs. It has been intensely studied to increase rifamycin yield from Amycolatopsis mediterranei, and nitrate is found to provide a stable and remarkable stimulating effect on t...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2020.00319
更新日期:2020-03-03 00:00:00
abstract::Sterols are essential components of eukaryotic cells whose biosynthesis and function has been studied extensively. Sterols are also recognized as the diagenetic precursors of steranes preserved in sedimentary rocks where they can function as geological proxies for eukaryotic organisms and/or aerobic metabolisms and en...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2016.00990
更新日期:2016-06-24 00:00:00
abstract::Bacteria adopt alternative cell fates during development. In Bacillus subtilis, the transition from planktonic growth to biofilm formation and sporulation is controlled by a complex regulatory circuit, in which the most important event is activation of Spo0A, a transcription factor and a master regulator for genes inv...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2016.01025
更新日期:2016-06-28 00:00:00
abstract::Yersinia pestis, responsible for causing fulminant plague, has evolved clonally from the enteric pathogen, Y. pseudotuberculosis, which in contrast, causes a relatively benign enteric illness. An ~97% nucleotide identity over 75% of their shared protein coding genes is maintained between these two pathogens, leaving m...
journal_title:Frontiers in microbiology
pub_type: 杂志文章,评审
doi:10.3389/fmicb.2015.00956
更新日期:2015-09-17 00:00:00
abstract::A number of secondary plant metabolites (e.g., flavonoids) possess antiviral/antimicrobial activity. Most flavonoids, however, are difficult to study, as they are immiscible in water-based systems. The relatively new semisynthetic α-glucosyl hesperitin (GH), and the natural plant product epigallocatechin gallate (EGCG...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2015.00359
更新日期:2015-04-29 00:00:00
abstract::Plant rhizospheres encompass a dynamic zone of interactions between microorganisms and their respective plant hosts. For decades, researchers have worked to understand how these complex interactions influence different aspects of plant growth, development, and evolution. Studies of plant-microbial interactions in the ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2018.01516
更新日期:2018-07-11 00:00:00
abstract::Modified cyclic dipeptides represent a diverse family of microbial secondary metabolites. They display a broad variety of biological and pharmacological activities and have long been recognized as privileged structures with the ability to bind to a wide range of receptors. This is due to their conformationally constra...
journal_title:Frontiers in microbiology
pub_type: 杂志文章,评审
doi:10.3389/fmicb.2015.00785
更新日期:2015-07-30 00:00:00
abstract::The family Marseilleviridae, defined as a group of icosahedral double-stranded DNA viruses with particle size of approximately 250 nm and genome size of 350-380 kbp, belongs to the nucleo-cytoplasmic family of large DNA viruses. The family Marseilleviridae is currently classified into lineages A-E. In this study, we i...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2019.01152
更新日期:2019-05-24 00:00:00
abstract::The alarming rise in the prevalence of antibiotic resistance among pathogenic bacteria poses a unique challenge for the development of effective therapeutic agents. Antimicrobial peptides (AMPs) have attracted a great deal of attention as a possible solution to the increasing problem of antibiotic-resistant bacteria. ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2018.01159
更新日期:2018-05-29 00:00:00
abstract::Altered gut microbiota are assumed to be involved in the pathogenesis of irritable bowel syndrome (IBS). However, gut microbiota alterations reported in different studies are divergent and sometimes even contradictory. To better elucidate the relationship between altered gut microbiota and IBS, we characterized fecal ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2018.01600
更新日期:2018-07-25 00:00:00
abstract::The Streptococcus bovis/Streptococcus equinus complex (SBSEC) comprises several species inhabiting the animal and human gastrointestinal tract (GIT). They match the pathobiont description, are potential zoonotic agents and technological organisms in fermented foods. SBSEC members are associated with multiple diseases ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章,评审
doi:10.3389/fmicb.2018.00603
更新日期:2018-04-10 00:00:00
abstract::Bacteria adapt to different environments by regulating cell division and several conditions that modulate cell division have been documented. Understanding how bacteria transduce environmental signals to control cell division is critical in understanding the global network of cell division regulation. In this article ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2019.00623
更新日期:2019-04-05 00:00:00
abstract::The filament fungal pathogen, Aspergillus flavus, spreads worldwide and contaminates several important crops. Histone posttranslational modifications are deeply involved in fungal development and virulence, but the biological function of the histone methyltransferase AflSet1 in A. flavus is still unknown. In the study...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2020.00234
更新日期:2020-02-18 00:00:00
abstract::Diatoms are a dominant group of eukaryotic phytoplankton that contribute substantially to global primary production and the cycling of important elements such as carbon and nitrogen. Heterotrophic bacteria, including members of the gammaproteobacteria, are commonly associated with diatom populations and may rely on th...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2016.00880
更新日期:2016-06-09 00:00:00
abstract::Two lytic bacteriophages, WCHABP1 and WCHABP12, were recovered from hospital sewage and were able to infect 9 and 12 out of 18 carbapenem-resistant Acinetobacter baumannii clinical strains, which belonged to different clones. Electron microscopy scan showed that both bacteriophages had the similar morphology as those ...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2018.00850
更新日期:2018-04-30 00:00:00
abstract::Vibrio cholerae can enter into a viable but non-culturable (VBNC) state in order to survive in unfavorable environments. In this study, we studied the roles of five physicochemical and microbiological factors or states, namely, different strains, growth phases, oxygen, temperature, and starvation, on the development o...
journal_title:Frontiers in microbiology
pub_type: 杂志文章
doi:10.3389/fmicb.2016.00404
更新日期:2016-03-30 00:00:00