scholarly journals KERAGAMAN BAKTERI PENGHASIL ENZIM PENGHIDROLISIS NITRIL DI PULAU ENGGANO BENGKULU

2018 ◽  
Vol 16 (3) ◽  
Author(s):  
Rini Riffiani ◽  
Nunik Sulistinah
Keyword(s):  
High Performance ◽  
Mandelic Acid ◽  
Sequence Similarity ◽  
Sole Source ◽  
Biologically Active ◽  
Rrna Gene ◽  
Enantiomerically Pure ◽  
Carbon And Nitrogen ◽  
Degrading Bacteria ◽  
Hydrolysis Of

Potential nitrile degrading microbes have been isolated from marine sponge, marine water and soil in Enggano Island. Nitrilase enzyme has a function in degrading nitrile compund. Nitrilases are important industrial enzymes because of their ability to produce biologically active to degrade enantiomers, such as S-(+)-1-(4’-isobutylphenyl) propionic acid (S-(+)-ibuprofen) and R-(-) mandelic acid. Mandelic acids, which are important as pharmaceutical intermediates, can be produced in enantiomerically pure form by the hydrolysis of their corresponding nitrile. The aim of the study was to explore the diversity of nitrile degrading bacteria in Enggano Island, and their ability to utilize nitrile as a substrate growth. Screening of such microbes were carried out by using microtitter plate method based on growth ability tested by INT (Iodonitrotetrazoliumchloride). Degradation product was determined by High Performance Liquid Chromatography (HPLC). Seventy nine bacteria were able to grow on acetamide, acetonitrile, benzonitrile, adiponitrile, mandelonitrile, succinonitrile, lactonitrile, dan benzilcyanide as the sole source of carbon and nitrogen. Two isolates, YIM 56238 and PO69, have shown to enantioselectively hydrolyze racemic mandelonitrile to mandelic acid. Based on 16S rRNA gene identification, these bacteria have the highest sequence similarity to Microccous endophyticus strain YIM 56238 and Rhodococcus pyridinivorans strain PO69.

scholarly journals Cobetia crustatorum sp. nov., a novel slightly halophilic bacterium isolated from traditional fermented seafood in Korea

2010 ◽  
Vol 60 (3) ◽  
pp. 620-626 ◽  
Author(s):  
Min-Soo Kim ◽  
Seong Woon Roh ◽  
Jin-Woo Bae
Keyword(s):  
Sequence Similarity ◽  
Phylogenetic Analyses ◽  
Nitrogen Sources ◽  
Optimal Growth ◽  
Halophilic Bacterium ◽  
Rrna Gene ◽  
Carbon And Nitrogen ◽  
Cobetia Marina ◽  
Slightly Halophilic Bacterium ◽  
Straight Rod

A slightly halophilic, Gram-stain-negative, straight-rod-shaped aerobe, strain JO1T, was isolated from jeotgal, a traditional Korean fermented seafood. Cells were observed singly or in pairs and had 2–5 peritrichous flagella. Optimal growth occurred at 25 °C, in 6.5 % (w/v) salts and at pH 5.0–6.0. Strain JO1T was oxidase-negative and catalase-positive. Cells did not reduce fumarate, nitrate or nitrite on respiration. Acid was produced from several carbohydrates and the strain utilized many sugars and amino acids as carbon and nitrogen sources. The main fatty acids were C12 : 0 3-OH, C16 : 0, C17 : 0 cyclo and summed feature 3 (C16 : 1 ω7c/iso-C15 : 0 2-OH). DNA–DNA hybridization experiments with strain JO1T and Cobetia marina DSM 4741T revealed 24 % relatedness, although high 16S rRNA gene sequence similarity (98.9 %) was observed between these strains. Based on phenotypic, genotypic and phylogenetic analyses, it is proposed that the isolate from jeotgal should be classified as a representative of a novel species, Cobetia crustatorum sp. nov., with strain JO1T (=KCTC 22486T=JCM 15644T) as the type strain.

scholarly journals Isolation and Characterization of Methanothermobacter crinale sp. nov., a Novel Hydrogenotrophic Methanogen from the Shengli Oil Field

2011 ◽  
Vol 77 (15) ◽  
pp. 5212-5219 ◽  
Author(s):  
Lei Cheng ◽  
Lirong Dai ◽  
Xia Li ◽  
Hui Zhang ◽  
Yahai Lu
Keyword(s):  
Oil Sands ◽  
Type Strain ◽  
High Performance ◽  
Sequence Similarity ◽  
Oil Field ◽  
Rrna Gene ◽  
Content Type ◽  
Chromatography Analysis ◽  
Hydrogenotrophic Methanogenesis ◽  
Isolation And Characterization

ABSTRACTSyntrophic acetate oxidation coupled with hydrogenotrophic methanogenesis is an alternative methanogenic pathway in certain thermophilic anaerobic environments such as high-temperature oil reservoirs and thermophilic biogas reactors. In these environments, the dominant thermophilic methanogens were generally related to uncultured organisms of the genusMethanothermobacter. Here we isolated two representative strains, Tm2Tand HMD, from the oil sands and oil production water in the Shengli oil field in the People's Republic of China. The type strain, Tm2T, was nonmotile and stained Gram positive. The cells were straight to slightly curved rods (0.3 μm in width and 2.2 to 5.9 μm in length), but some of them possessed a coccal shape connecting with the rods at the ends. Strain Tm2Tgrew with H2-CO2, but acetate is required. Optimum growth of strain Tm2Toccurred in the presence of 0.025 g/liter NaCl at pH 6.9 and a temperature of 65°C. The G+C content of the genomic DNA was 40.1 mol% ± 1.3 mol% (by the thermal denaturation method) or 41.1 mol% (by high-performance liquid chromatography). Analysis of the 16S rRNA gene sequence indicated that Tm2Twas most closely related toMethanothermobacter thermautotrophicusΔHTandMethanothermobacter wolfeiiVKM B-1829T(both with a sequence similarity of 96.4%). Based on these phenotypic and phylogenic characteristics, a novel species was proposed and namedMethanothermobacter crinalesp. nov. The type strain is Tm2T(ACCC 00699T= JCM 17393T).

scholarly journals Chelativorans multitrophicus gen. nov., sp. nov. and Chelativorans oligotrophicus sp. nov., aerobic EDTA-degrading bacteria

2010 ◽  
Vol 60 (5) ◽  
pp. 1044-1051 ◽  
Author(s):  
Nina V. Doronina ◽  
Elena N. Kaparullina ◽  
Yuri A. Trotsenko ◽  
Bernd Nörtemann ◽  
Margarete Bucheli-Witschel ◽  
...  
Keyword(s):  
Dna Hybridization ◽  
Type Strain ◽  
Gene Sequence ◽  
Sequence Similarity ◽  
Rrna Gene ◽  
Strictly Aerobic ◽  
The Novel ◽  
Phenotypic Properties ◽  
Mesorhizobium Loti ◽  
Degrading Bacteria

Two previously isolated strains (DSM 9103T and LPM-4T) able to grow with EDTA (facultatively and obligately, respectively) as the source of carbon, nitrogen and energy were investigated in order to clarify their taxonomic positions. The strains were strictly aerobic, Gram-negative, asporogenous and non-motile rods that required biotin for growth. Reproduction occurred by binary fission. The strains were mesophilic and neutrophilic. Their major fatty acids were summed feature 7 (consisting of C18 : 1 ω7c, C18 : 1 ω9t and/or C18 : 1 ω12t) and C19 : 0 cyclo ω8c. The polyamine pattern revealed homospermidine as a major polyamine. Predominant polar lipids were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, phosphatidyldimethylethanolamine, phosphatidylmonomethylethanolamine and diphosphatidylglycerol. Mesorhizobium-specific ornithine lipid was absent. The predominant isoprenoid quinone was Q-10. The DNA G+C values were 60.8 and 63.1 mol% (T m) for strains LPM-4T and DSM 9103T, respectively. The level of 16S rRNA gene sequence similarity between these EDTA-utilizers was 99.3 % while the DNA–DNA hybridization value was only 37 %. Both strains were phylogenetically related to members of the genera Aminobacter and Mesorhizobium (95–97 % sequence similarity). However, DNA–DNA hybridization values between the novel EDTA-degrading strains and Aminobacter aminovorans DSM 7048T and Mesorhizobium loti DSM 2626T were low (10–11 %). Based on their genomic and phenotypic properties, the new alphaproteobacterial strains are assigned to a novel genus, Chelativorans gen. nov., with the names Chelativorans multitrophicus sp. nov. (type strain DSM 9103T=VKM B-2394T) and Chelativorans oligotrophicus sp. nov. (type strain LPM-4T=VKM B-2395T=DSM 19276T).

scholarly journals Paenibacillus soli sp. nov., a xylanolytic bacterium isolated from soil

2007 ◽  
Vol 57 (1) ◽  
pp. 146-150 ◽  
Author(s):  
Min-Ju Park ◽  
Ho-Bin Kim ◽  
Dong-Shan An ◽  
Hee-Chan Yang ◽  
Seok-Tae Oh ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Sequence Similarity ◽  
Cellular Fatty Acid ◽  
Rrna Gene ◽  
Phenotypic Characteristics ◽  
Dna Relatedness ◽  
Degrading Bacteria ◽  
The Republic ◽  
Relatedness Data

Two novel polysaccharide-degrading bacteria (strains DCY03T and DCY04) were isolated from a soil sample of a ginseng field in the Republic of Korea and were identified as representing members of the genus Paenibacillus on the basis of phenotypic characteristics and phylogenetic inference based on 16S rRNA gene sequences. Cells of the two isolates were Gram-positive, spore-forming, non-motile, straight rods. Based on DNA–DNA relatedness data, the strains were considered to belong to the same species. The DNA G+C content ranged from 56.6 to 57.0 mol%. The predominant cellular fatty acid was anteiso-C15 : 0 (63.8–62.8 %). Levels of 16S rRNA gene sequence similarity between the two novel isolates and the type strains of recognized Paenibacillus species were 91.4–96.5 %. Strains DCY03T and DCY04 could clearly be distinguished from phylogenetically closely related Paenibacillus species on the basis of DNA–DNA relatedness data and phenotypic characteristics. Therefore, on the basis of these data, the two isolates are considered to represent a novel species of the genus Paenibacillus, for which the name Paenibacillus soli sp. nov. is proposed. The type strain is DCY03T (=KCTC 13010T=LMG 23604T).

scholarly journals BIOTRANSFORMASI ADIPONITRIL OLEH Bacillus licheniformis BA2

2004 ◽  
Vol 10 (1) ◽  
pp. 25-30
Author(s):  
Ahmad Thontowi ◽  
Eko W. Pamuji ◽  
Bambang Sunarko
Keyword(s):  
Bacillus Licheniformis ◽  
Adipic Acid ◽  
High Performance ◽  
Biomass Yield ◽  
Sole Source ◽  
Lag Phase ◽  
Optimum Conditions ◽  
Carbon And Nitrogen ◽  
Nylon 6,6 ◽  
Sequential Formation

Adipic acid represents one of the especial materials which used for the synthesis of nylon 6,6,- is a very important material results from polyamide industry. Adiponitrile biotransformation become adipic acid represent an alternative synthesis besides chemically. The purpose of this research was to determine optimum conditions for Bacillus licheniformis BA2 growth for adiponitrile degradation, and also know its pattern. The obtained information, to be expected can be used as reference for scaling up of adipic acid production. B. licheniformis BA2 was able to utilize acetonitrile and adiponitrile as the sole source of carbon and nitrogen. The growth on adiponitrile 120 mM mixture with acetonitrile 30 mM gave higher growth rate and biomass yield than growth on another subsrates. B. licheniformis BA2 have lag phase during 68 hours, logaritmic phase passed by during 104 hours, while stasioner phase just reached by after 172 hours. High-performance liquid chromatography of adiponitrile degradation by crude bacterial revealed a decrease in adiponitrile with the sequential formation of adipamide and adipic acid. Ammonia was also detected by colorimetric procedures. As for adipic acid rendemen at 420 minutes equal to 19.35 percent.

scholarly journals Nitratireductor pacificus sp. nov., isolated from a pyrene-degrading consortium

2011 ◽  
Vol 61 (6) ◽  
pp. 1386-1391 ◽  
Author(s):  
Qiliang Lai ◽  
Zhiwei Yu ◽  
Jianning Wang ◽  
Huanzi Zhong ◽  
Fengqin Sun ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Gene Sequence ◽  
Sequence Similarity ◽  
16S Rrna Gene Sequence ◽  
Rrna Gene ◽  
Rrna Gene Sequence ◽  
Chromosomal Dna ◽  
Dna Relatedness ◽  
Degrading Bacteria

Strain pht-3BT was isolated from a pyrene-degrading consortium of an enriched sediment from the Pacific Ocean, collected during the screening of polycyclic aromatic hydrocarbon-degrading bacteria. Cells were Gram-negative, short rods that were motile by means of flagella. Growth was observed at 0–7 % NaCl and 10–41 °C. The isolate was able to reduce nitrate to nitrite, but not to nitrogen. 16S rRNA gene sequence comparisons showed that strain pht-3BT was most closely related to Nitratireductor aquibiodomus NL21T (97.3 % 16S rRNA gene sequence similarity), N. indicus C115T (97.1 %), N. basaltis J3T (96.8 %) and N. kimnyeongensis KY 101T (96.7 %). DNA–DNA hybridization between strain pht-3BT and these reference strains revealed 55, 54, 28 and 42 % DNA–DNA relatedness, respectively. The dominant fatty acids were C19 : 0ω8c cyclo (22.6 %) and summed feature 8 (consisting of C18 : 1ω7c and/or C18 : 1ω6c; 60.4 %). The G+C content of the chromosomal DNA was 63 mol%. These characteristics were in good agreement with those of members of the genus Nitratireductor. According to cell morphology, physiology, fatty acid composition, 16S rRNA gene sequence analysis and DNA–DNA relatedness, the isolate belonged to the genus Nitratireductor but could be readily distinguished from recognized species of the genus. Therefore a novel species is proposed to accommodate strain pht-3BT, for which the name Nitratireductor pacificus sp. nov. is proposed. The type strain is pht-3BT ( = CCTCC AB 209302T = LMG 25541T = MCCC 1A01024T).

scholarly journals Isolation of Adherent Polycyclic Aromatic Hydrocarbon (PAH)-Degrading Bacteria Using PAH-Sorbing Carriers

2000 ◽  
Vol 66 (5) ◽  
pp. 1834-1843 ◽  
Author(s):  
Leen Bastiaens ◽  
Dirk Springael ◽  
Pierre Wattiau ◽  
Hauke Harms ◽  
Rupert deWachter ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Bacterial Species ◽  
Sole Source ◽  
Rrna Gene ◽  
Bacterial Strains ◽  
High Adhesion ◽  
Degrading Bacteria ◽  
Polycyclic Aromatic ◽  
Adhesion Efficiency

ABSTRACT Two different procedures were compared to isolate polycyclic aromatic hydrocarbon (PAH)-utilizing bacteria from PAH-contaminated soil and sludge samples, i.e., (i) shaken enrichment cultures in liquid mineral medium in which PAHs were supplied as crystals and (ii) a new method in which PAH degraders were enriched on and recovered from hydrophobic membranes containing sorbed PAHs. Both techniques were successful, but selected from the same source different bacterial strains able to grow on PAHs as the sole source of carbon and energy. The liquid enrichment mainly selected for Sphingomonasspp., whereas the membrane method exclusively led to the selection ofMycobacterium spp. Furthermore, in separate membrane enrichment set-ups with different membrane types, three repetitive extragenic palindromic PCR-related Mycobacterium strains were recovered. The new Mycobacterium isolates were strongly hydrophobic and displayed the capacity to adhere strongly to different surfaces. One strain, Mycobacterium sp. LB501T, displayed an unusual combination of high adhesion efficiency and an extremely high negative charge. This strain may represent a new bacterial species as suggested by 16S rRNA gene sequence analysis. These results indicate that the provision of hydrophobic sorbents containing sorbed PAHs in the enrichment procedure discriminated in favor of certain bacterial characteristics. The new isolation method is appropriate to select for adherent PAH-degrading bacteria, which might be useful to biodegrade sorbed PAHs in soils and sludge.

scholarly journals Cohnella xylanilytica sp. nov. and Cohnella terrae sp. nov., xylanolytic bacteria from soil

2010 ◽  
Vol 60 (12) ◽  
pp. 2913-2917 ◽  
Author(s):  
Saowapar Khianngam ◽  
Somboon Tanasupawat ◽  
Ancharida Akaracharanya ◽  
Kwang Kyu Kim ◽  
Keun Chul Lee ◽  
...  
Keyword(s):  
Dna Hybridization ◽  
Type Strain ◽  
Novel Species ◽  
Sequence Similarity ◽  
Diaminopimelic Acid ◽  
Rrna Gene ◽  
16S Rrna Gene Sequences ◽  
Physiological And Biochemical Characteristics ◽  
Degrading Bacteria ◽  
Physiological And Biochemical

Two xylan-degrading bacteria, strains MX15-2T and MX21-2T, were isolated from soils collected in Nan province, Thailand. Cells were Gram-reaction-positive, facultatively anaerobic, spore-forming and rod-shaped. They contained meso-diaminopimelic acid in the cell-wall peptidoglycan. The major menaquinone was MK-7. iso-C16 : 0 and anteiso-C15 : 0 were the predominant cellular fatty acids. Diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and lysyl-phosphatidylglycerol were the major polar lipids. The genomic DNA G+C contents of strains MX15-2T and MX21-2T were 63.0 and 65.1 mol%, respectively. Phylogenetic analysis using 16S rRNA gene sequences showed that strains MX15-2T and MX21-2T were affiliated with the genus Cohnella and were closely related to Cohnella thermotolerans CCUG 47242T, with 96.5 and 95.6 % sequence similarity, respectively. The strains could be clearly distinguished from each other and from all known species of the genus Cohnella based on their physiological and biochemical characteristics as well as their phylogenetic positions and levels of DNA–DNA hybridization. Therefore, these two strains represent novel species of the genus Cohnella, for which the names Cohnella xylanilytica sp. nov. (type strain MX15-2T =KCTC 22294T =PCU 309T =TISTR 1891T) and Cohnella terrae sp. nov. (type strain MX21-2T =KCTC 22295T =PCU 310T =TISTR 1892T) are proposed.

Degradation of acrylamide by immobilized cells of a Pseudomonas sp. and Xanthomonas maltophilia

1993 ◽  
Vol 39 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Mohamed S. Nawaz ◽  
Wirt Franklin ◽  
Carl E. Cerniglia
Keyword(s):  
Acrylic Acid ◽  
Calcium Alginate ◽  
Specific Activity ◽  
Immobilized Cells ◽  
Sole Source ◽  
Pseudomonas Sp ◽  
Batch Cultures ◽  
Xanthomonas Maltophilia ◽  
Carbon And Nitrogen ◽  
Hydrolysis Of

Two bacterial isolates capable of utilizing acrylamide as the sole source of carbon and nitrogen were isolated from herbicide-contaminated soil samples and identified as Pseudomonas sp. and Xanthomonas maltophilia. Batch cultures of Pseudomonas sp. and X. maltophilia completely degraded 62.8 mM acrylamide to acrylic acid and ammonia in 24 and 48 h, respectively. Pseudomonas sp. And X. maltophilia, when immobilized in calcium alginate, markedly increased the rate of degradation of acrylamide over batch cultures. Cells of the isolates immobilized in calcium alginate degraded acrylamide to acrylic acid and ammonia in less than 6 h. Initial metabolism of acrylamide by immobilized cells of Pseudomonas sp. followed by inoculation with nonimmobilized cells after 6 h totally removed acrylamide and its metabolites in 72 h. A similar procedure with X. maltophilia resulted in the total metabolism of acrylamide in 96 h. An inducible, intracellular amidase was responsible for the hydrolysis of acrylamide to acrylic acid and ammonia. The specific activity of Pseudomonas sp. amidase was higher than the specific activity of X. maltophilia amidase.Key words: acrylamide, biodegradation, immobilization.

scholarly journals DNA-SIP and repeated isolation corroborate Variovorax as a key organism in maintaining the genetic memory for linuron biodegradation in an agricultural soil

2020 ◽  
Author(s):  
Harry Lerner ◽  
Başak Öztürk ◽  
Anja B. Dohrmann ◽  
Joice Thomas ◽  
Kathleen Marchal ◽  
...  
Keyword(s):  
Agricultural Soils ◽  
Sequence Similarity ◽  
Stable Isotope Probing ◽  
Rrna Gene ◽  
Agricultural Field ◽  
Bacterial Populations ◽  
Catabolic Genes ◽  
Degrading Bacteria ◽  
History Of

AbstractThe frequent exposure of agricultural soils to pesticides often leads to microbial adaptation, including the development of dedicated microbial populations that utilize the pesticide compound as a carbon and energy source. Soil from an agricultural field in Halen (Belgium) with a history of linuron exposure has been studied for its linuron-degrading bacterial populations at two time points over the past decade and Variovorax was appointed as a key linuron degrader. Like most studies on pesticide degradation, these studies relied on isolates that were retrieved through bias-prone enrichment procedures and therefore might not represent the in situ active pesticide-degrading populations. In this study, we revisited the Halen field and applied, in addition to enrichment-based isolation, DNA stable isotope probing (DNA-SIP), to identify the in situ linuron degrading bacteria. DNA-SIP unambiguously linked Variovorax and its linuron catabolic genes to linuron dissipation, likely through synergistic cooperation between two species. Additionally, two linuron mineralizing Variovorax isolates were obtained with high 16S rRNA gene sequence similarity to strains isolated from the same field a decade earlier. The results confirm Variovorax as the in situ degrader of linuron in the studied agricultural field and corroborate the genus as key in the maintenance of a robust genetic memory regarding linuron degradation functionality in the examined field.

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