Isolation of an extremely halophilic arhaeon Natrialba sp. C21 able to degrade aromatic compounds and to produce stable biosurfactant at high salinity

Khemili, Souad; Kebbouche-Gana, Salima; Akmoussi-Toumi, Siham; Angar, Yassmina; Gana, Mohamed Lamine

doi:10.1007/s00792-015-0783-9

Cited by 47 publications

(17 citation statements)

References 70 publications

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“…Natrialba sp . C21 degraded phenol (Khemili-Talbi et al 2015 ). The halophilic nature of these isolates and the lack of known lignolytic activity seem to suggest that they contribute with the degradation of aromatic breakdown products that have ended up in saltwater environments, which could be speculated to be a downstream (or downriver ) extension of the lignin microbial niche.…”

Section: The Microbial Diversity In the Lignin Niche As Reported In mentioning

confidence: 99%

Mapping the diversity of microbial lignin catabolism: experiences from the eLignin database

Brink

Ravi

Lidén

et al. 2019

Appl Microbiol Biotechnol

102

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Lignin is a heterogeneous aromatic biopolymer and a major constituent of lignocellulosic biomass, such as wood and agricultural residues. Despite the high amount of aromatic carbon present, the severe recalcitrance of the lignin macromolecule makes it difficult to convert into value-added products. In nature, lignin and lignin-derived aromatic compounds are catabolized by a consortia of microbes specialized at breaking down the natural lignin and its constituents. In an attempt to bridge the gap between the fundamental knowledge on microbial lignin catabolism, and the recently emerging field of applied biotechnology for lignin biovalorization, we have developed the eLignin Microbial Database ( www.elignindatabase.com ), an openly available database that indexes data from the lignin bibliome, such as microorganisms, aromatic substrates, and metabolic pathways. In the present contribution, we introduce the eLignin database, use its dataset to map the reported ecological and biochemical diversity of the lignin microbial niches, and discuss the findings.

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Section: The Microbial Diversity In the Lignin Niche As Reported In mentioning

confidence: 99%

Mapping the diversity of microbial lignin catabolism: experiences from the eLignin database

Brink

Ravi

Lidén

et al. 2019

Appl Microbiol Biotechnol

102

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“…Natrialba sp. st. C21 has also been isolated from oil-contaminated saline water in Ain Salah, Algeria [ 37 ]. This strain can degrade phenol, naphthalene, and pyrene through an ortho-cleavage pathway and exhibits catalase, oxidase, and Tween 80 esterase activity [ 37 ].…”

Section: Archaea In the Degradation Of Organicsmentioning

confidence: 99%

“…st. C21 has also been isolated from oil-contaminated saline water in Ain Salah, Algeria [ 37 ]. This strain can degrade phenol, naphthalene, and pyrene through an ortho-cleavage pathway and exhibits catalase, oxidase, and Tween 80 esterase activity [ 37 ]. Acikgoz and Ozcan [ 38 ] found eight Halobacteriaceae out of a screening library of 103 isolates that could degrade and tolerate above 200 ppm phenol.…”

Section: Archaea In the Degradation Of Organicsmentioning

confidence: 99%

“…Additionally, many methodologies that have been used to study Archaea are prone to biases, which may cloud our understanding. A varied number of archaeal and “universal” amplification primer pairs are known and are used to study archaeal diversity [ 32 , 37 , 82 , 83 , 86 ]. Interpreting results from these methods should be done carefully.…”

Section: Research Needsmentioning

confidence: 99%

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Diversity and Niche of Archaea in Bioremediation

Krzmarzick

Taylor

Xiang

et al. 2018

Archaea

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Bioremediation is the use of microorganisms for the degradation or removal of contaminants. Most bioremediation research has focused on processes performed by the domain Bacteria; however, Archaea are known to play important roles in many situations. In extreme conditions, such as halophilic or acidophilic environments, Archaea are well suited for bioremediation. In other conditions, Archaea collaboratively work alongside Bacteria during biodegradation. In this review, the various roles that Archaea have in bioremediation is covered, including halophilic hydrocarbon degradation, acidophilic hydrocarbon degradation, hydrocarbon degradation in nonextreme environments such as soils and oceans, metal remediation, acid mine drainage, and dehalogenation. Research needs are addressed in these areas. Beyond bioremediation, these processes are important for wastewater treatment (particularly industrial wastewater treatment) and help in the understanding of the natural microbial ecology of several Archaea genera.

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“…mediterranei is capable of using oil as its sole carbon and energy source [301] and Natrialba sp. strain C21 grows on the aromatic coumpounds phenol, naphthalene and pyrene as the sole carbon source [302]. Therefore, these organisms could be good choices for treatment of hydrocarbon-polluted saline environments.…”

Section: Potential Biotechnological Applications Of Haloarchaeamentioning

confidence: 99%

Systematics of haloarchaea and biotechnological potential of their hydrolytic enzymes

et al. 2017

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Halophilic archaea, also referred to as haloarchaea, dominate hypersaline environments. To survive under such extreme conditions, haloarchaea and their enzymes have evolved to function optimally in environments with high salt concentrations and, sometimes, with extreme pH and temperatures. These features make haloarchaea attractive sources of a wide variety of biotechnological products, such as hydrolytic enzymes, with numerous potential applications in biotechnology. The unique trait of haloarchaeal enzymes, haloenzymes, to sustain activity under hypersaline conditions has extended the range of already-available biocatalysts and industrial processes in which high salt concentrations inhibit the activity of regular enzymes. In addition to their halostable properties, haloenzymes can also withstand other conditions such as extreme pH and temperature. In spite of these benefits, the industrial potential of these natural catalysts remains largely unexplored, with only a few characterized extracellular hydrolases. Because of the applied impact of haloarchaea and their specific ability to live in the presence of high salt concentrations, studies on their systematics have intensified in recent years, identifying many new genera and species. This review summarizes the current status of the haloarchaeal genera and species, and discusses the properties of haloenzymes and their potential industrial applications. SYSTEMATICS OF HALOPHILIC ARCHAEAHalophilic micro-organisms are found in the three domains of life, and are extremophiles living in hypersaline environments in the presence of salt (generally NaCl) as a specific requisite for their growth [1]. Hypersaline environments contain higher salt concentrations than seawater (3.5 % total dissolved salts) [2]. According to the optimum NaCl concentration for growth, micro-organisms fall into one of the following categories: extreme halophiles with optimum growth at 15-30 % (2.5-5.2 M) NaCl; moderate halophiles with optimum growth at 3-15 % (0.5-2.5 M) NaCl; slight halophiles with optimum growth at 1-3 % (0.2-0.5 M) NaCl; non-halophiles with optimum growth at less than 1 % (0.2 M) NaCl; and halotolerant micro-organisms which are non-halophiles showing the ability to tolerate high NaCl concentrations [3]. Halophiles can live in hypersaline environments because they are able to sustain osmotic balance. They use two main strategies to withstand the adverse consequences of water loss when exposed to high salt concentrations. The first strategy used by extremely halophilic archaea (haloarchaea) and halophilic anaerobic bacteria such as members of Halanaerobiales is known as the 'salt-in-cytoplasm' strategy, during which salts such as NaCl or KCl accumulate in the cytoplasm at concentrations similar to the extracellular ones [4,5]. Another mechanism to cope with high salt concentrations is the accumulation of organic molecules such as amino acids, sugars and polyols, known as compatible solutes or osmolytes. Compatible solutes are small and highly soluble molecules that can...

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Isolation of an extremely halophilic arhaeon Natrialba sp. C21 able to degrade aromatic compounds and to produce stable biosurfactant at high salinity

Cited by 47 publications

References 70 publications

Mapping the diversity of microbial lignin catabolism: experiences from the eLignin database

Mapping the diversity of microbial lignin catabolism: experiences from the eLignin database

Diversity and Niche of Archaea in Bioremediation

Systematics of haloarchaea and biotechnological potential of their hydrolytic enzymes

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