Functional genes and thermophilic microorganisms responsible for arsenite oxidation from the shallow sediment of an untraversed hot spring outlet

Ecotoxicology ◽  
2017 ◽  
Vol 26 (4) ◽  
pp. 490-501 ◽  
Author(s):  
Ye Yang ◽  
Yao Mu ◽  
Xian-Chun Zeng ◽  
Weiwei Wu ◽  
Jie Yuan ◽  
...  
Keyword(s):  
Hot Spring ◽  
Functional Genes ◽  
Thermophilic Microorganisms ◽  
Arsenite Oxidation

scholarly journals ISOLATION OF THERMOPHILIC LIPASE PRODUCING BACTERIUM FROM HOT SPRINGS AT THE EAST COAST OF PENINSULAR MALAYSIA

2021 ◽  
Vol 11 (1) ◽  
pp. 1-10
Author(s):  
Tengku Hamid ◽  
◽  
Nur Abidin ◽  
Nurmusfirah Hasan ◽  
◽  
...  
Keyword(s):  
Hot Springs ◽  
East Coast ◽  
Hot Spring ◽  
Thermophilic Bacteria ◽  
Natural Habitat ◽  
Primary Source ◽  
Industrial Applications ◽  
Peninsular Malaysia ◽  
Thermostable Enzymes ◽  
Thermophilic Microorganisms

Hot spring is a natural habitat for thermophilic bacteria and the primary source of thermostable enzymes useful in industrial applications. In Malaysia, the search for thermophilic organisms has been focused on hot springs, especially on the peninsular West coast. In this work, lipase or esterase producing thermophilic microorganisms were isolated from East coast hot springs in Pahang and Terengganu's states. Morphological and biochemical analysis were carried out on Isolates LH1, LH2, LH3, LH4, LH5, B2B2 and S1B4, which showed that they are gram positive, aerobic, spore forming, and motile organisms. All of the seven isolates showed the ability to grow at 45°C and formed hydrolysis zones on tributyrin agar plates. However, only isolate B2B2 and S1B4 were able to thrive at higher temperatures of up to 65°C. The genotypic characterisation was carried out using 16S rRNA sequencing. Bacillus and Geobacillus species were found to be the dominant bacteria isolated from these hot springs. From La hot spring, isolate LH1 (MT 645486), Isolates LH2 (MT645483), LH3 (MT645484), LH4 (MT 645485) and LH5 (MT 645487) were all closely related to Bacillus sp. (at 97.3-97.9%). Meanwhile, from Bentong and Sungai Lembing hot springs, isolates B2B2 (MT668631) and S1B4 (MT668632) were near related to either Geobacillus kaustophilus or Geobacillus thermoleovorans; each at 98.5% and 97.9% similarity, respectively. These strains from Geobacillus sp. were able to thrive at higher temperature and their thermostable esterases or lipases have properties useful for biotechnological applications.

Bacterial Communities and Functional Genes Stimulated During Anaerobic Arsenite Oxidation and Nitrate Reduction in a Paddy Soil

2019 ◽  
Vol 54 (4) ◽  
pp. 2172-2181 ◽  
Author(s):  
Xiaomin Li ◽  
Jiangtao Qiao ◽  
Shuang Li ◽  
Max M. Häggblom ◽  
Fangbai Li ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Nitrate Reduction ◽  
Bacterial Communities ◽  
Functional Genes ◽  
Arsenite Oxidation

scholarly journals Coupled Arsenotrophy in a Hot Spring Photosynthetic Biofilm at Mono Lake, California

2010 ◽  
Vol 76 (14) ◽  
pp. 4633-4639 ◽  
Author(s):  
Shelley E. Hoeft ◽  
Thomas R. Kulp ◽  
Sukkyun Han ◽  
Brian Lanoil ◽  
Ronald S. Oremland
Keyword(s):  
Hot Springs ◽  
Hot Spring ◽  
Amino Acid Identity ◽  
Mono Lake ◽  
Functional Genes ◽  
Rrna Gene ◽  
Oxidation Activity ◽  
The Family ◽  
Pcr Products ◽  
Dark Fixation

ABSTRACT Red-pigmented biofilms grow on rock and cobble surfaces present in anoxic hot springs located on Paoha Island in Mono Lake. The bacterial community was dominated (∼ 85% of 16S rRNA gene clones) by sequences from the photosynthetic Ectothiorhodospira genus. Scraped biofilm materials incubated under anoxic conditions rapidly oxidized As(III) to As(V) in the light via anoxygenic photosynthesis but could also readily reduce As(V) to As(III) in the dark at comparable rates. Back-labeling experiments with 73As(V) demonstrated that reduction to 73As(III) also occurred in the light, thereby illustrating the cooccurrence of these two anaerobic processes as an example of closely coupled arsenotrophy. Oxic biofilms also oxidized As(III) to As(V). Biofilms incubated with [14C]acetate oxidized the radiolabel to 14CO2 in the light but not the dark, indicating a capacity for photoheterotrophy but not chemoheterotrophy. Anoxic, dark-incubated samples demonstrated As(V) reduction linked to additions of hydrogen or sulfide but not acetate. Chemoautotrophy linked to As(V) as measured by dark fixation of [14C]bicarbonate into cell material was stimulated by either H2 or HS−. Functional genes for the arsenate respiratory reductase (arrA) and arsenic resistance (arsB) were detected in sequenced amplicons of extracted DNA, with about half of the arrA sequences closely related (∼98% translated amino acid identity) to those from the family Ectothiorhodospiraceae. Surprisingly, no authentic PCR products for arsenite oxidase (aoxB) were obtained, despite observing aerobic arsenite oxidation activity. Collectively, these results demonstrate close linkages of these arsenic redox processes occurring within these biofilms.

scholarly journals Thioarsenate Formation Coupled with Anaerobic Arsenite Oxidation by a Sulfate-Reducing Bacterium Isolated from a Hot Spring

2017 ◽  
Vol 8 ◽  
Author(s):  
Geng Wu ◽  
Liuqin Huang ◽  
Hongchen Jiang ◽  
Yue’e Peng ◽  
Wei Guo ◽  
...  
Keyword(s):  
Hot Spring ◽  
Arsenite Oxidation ◽  
Sulfate Reducing

scholarly journals Isolation, Biochemical Characterisation and Identification of Thermotolerant and Cellulolytic Paenibacillus lactis and Bacillus licheniformis

2021 ◽  
Vol 59 (3) ◽  
Author(s):  
Krzysztof Makowski ◽  
Martyna Leszczewicz ◽  
Natalia Broncel ◽  
Lidia Lipińska-Zubrycka ◽  
Adrian Głębski ◽  
...  
Keyword(s):  
Bacillus Licheniformis ◽  
Hot Spring ◽  
Growth Curves ◽  
Maximum Growth ◽  
Cellulolytic Activity ◽  
Bacterial Strains ◽  
Thermophilic Microorganisms ◽  
Biochemical Characteristics ◽  
Cmcase Activity ◽  
Biochemical Characterisation

Research background. Cellulose is an ingredient of waste materials that can be converted to other valuable substances. This is possible provided that, the polymer molecule will be degraded to smaller particles, used as a carbon source by microorganisms. Because of the frequently applied methods of pre-treatment of lignocellulosic materials, the cellulases derived from thermophilic microorganisms are particularly desirable. Experimental approach. We were looking for cellulolytic microorganisms able to grow at 50 °C. We described their morphological features and biochemical characteristics based on CMCase activity and the api®ZYM. The growth curves, during incubation at 50 °C, were examined using the microbioreactor BioLector®. Results and conclusions. 40 bacterial strains were isolated from fermenting hay, geothermal karst spring, hot spring and geothermal pond at 50 °C. The vast majority of the bacteria were Gram-positive and rod-shaped with the maximum growth temperature of at least 50 °C. We also demonstrated a large diversity of biochemical characteristics among the microorganism. The CMCase activity was confirmed for 27 strains. However, the hydrolysis capacities (HC) were significant in bacterial strains: BBLN1, BSO6, BSO10, BSO13 and BSO14, and reached 2.74, 1.62, 1.30, 1.38 and 8.02 respectively. Rapid and stable growth was presented, among others, by BBLN1, BSO10, BSO13 and BSO14. The strains fulfilled the selection conditions and were identified based on the 16S rDNA sequences. BBLN1, BSO10, BSO13 were classified as Bacillus licheniformis, whereas BSO14 as Paenibacillus lactis. Novelty and scientific contribution. We described cellulolytic activity and biochemical characteristics of many bacteria isolated from hot environments. We are also the first to report the cellulolytic activity of thermotolerant P.s lactis. Described strains can be a source of new thermostable cellulases, which are extremely desirable in various branches of the circular bioeconomy.

scholarly journals Isolation and Characterisation of Thermophilic Bacillus licheniformis SUNGC2 as Producer of α-Amylase from Malaysian Hot Spring

2020 ◽  
Vol 28 (S2) ◽  
Author(s):  
Marwan Jawad Msarah ◽  
Ayesha Firdose ◽  
Izyanti Ibrahim ◽  
Wan Syaidatul Aqma
Keyword(s):  
Bacillus Licheniformis ◽  
Specific Activity ◽  
Hot Spring ◽  
Ammonium Phosphate ◽  
Fold Increase ◽  
Relative Activity ◽  
Biochemical Properties ◽  
Culture Conditions ◽  
Thermophilic Microorganisms ◽  
Amylase Production

Screening of new source of novel and industrially useful enzymes is a key research pursuit in enzyme biotechnology. The study aims to report the characteristics of novel thermophilic microorganisms isolated from Sungai Klah (SK) Hot Spring, Perak, Malaysia, that can produce α-amylase. The morphological and biochemical properties were examined for SUNGC2 sample. The isolate was further screened for amylase, followed by 16S rRNA and analytical profile index (API) test. This isolate was further subjected to pH optimisation for α-amylase production. It was found that SUNGC2 was an α-amylase producer and was identified as Bacillus licheniformis SUNGC2 with NCBI accession numbers MH062901. The enzyme was found to exhibit an optimum temperature of 50°C and a pH of 7.0. The relative activity of the enzyme was obtained based on the improvement of the culture conditions. The highest amount of amylase production was 24.65 U/mL at pH 7.0, consecutively the growth was also highest at pH 7.0 with a 9.45-fold increase in specific activity by ammonium phosphate precipitation of 80% (w/v). The results showed that the bacteria isolated from the hot spring are a significant source of thermophilic enzymes that are highly promising in biotechnology.

scholarly journals Genomic Insight of Alicyclobacillus mali FL18 Isolated From an Arsenic-Rich Hot Spring

2021 ◽  
Vol 12 ◽  
Author(s):  
Martina Aulitto ◽  
Giovanni Gallo ◽  
Rosanna Puopolo ◽  
Angela Mormone ◽  
Danila Limauro ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Tolerance ◽  
Hot Spring ◽  
Heavy Metal Tolerance ◽  
Extreme Temperature ◽  
Campi Flegrei ◽  
Elevated Concentration ◽  
Thermophilic Microorganisms ◽  
Toxic Compounds ◽  
Starting Point

Extreme environments are excellent places to find microorganisms capable of tolerating extreme temperature, pH, salinity pressure, and elevated concentration of heavy metals and other toxic compounds. In the last decades, extremophilic microorganisms have been extensively studied since they can be applied in several fields of biotechnology along with their enzymes. In this context, the characterization of heavy metal resistance determinants in thermophilic microorganisms is the starting point for the development of new biosystems and bioprocesses for environmental monitoring and remediation. This work focuses on the isolation and the genomic exploration of a new arsenic-tolerant microorganism, classified as Alicyclobacillus mali FL18. The bacterium was isolated from a hot mud pool of the solfataric terrains in Pisciarelli, a well-known hydrothermally active zone of the Campi Flegrei volcano near Naples in Italy. A. mali FL18 showed a good tolerance to arsenite (MIC value of 41 mM), as well as to other metals such as nickel (MIC 30 mM), cobalt, and mercury (MIC 3 mM and 17 μM, respectively). Signatures of arsenic resistance genes (one arsenate reductase, one arsenite methyltransferase, and several arsenite exporters) were found interspersed in the genome as well as several multidrug resistance efflux transporters that could be involved in the export of drugs and heavy metal ions. Moreover, the strain showed a high resistance to bacitracin and ciprofloxacin, suggesting that the extreme environment has positively selected multiple resistances to different toxic compounds. This work provides, for the first time, insights into the heavy metal tolerance and antibiotic susceptibility of an Alicyclobacillus strain and highlights its putative molecular determinants.

Sign in / Sign up

Export Citation Format

Share Document