Consulta: subjectFacets:"Archaeon"
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Data/hora: 16/06/2024 17:33:11

Characterization of a highly thermostable alkaline phosphatase from the euryarchaeon Pyrococcus abyssi
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Zappa, Sebastien; Rolland, Jean-luc; Flament, Didier; Gueguen, Yannick; Boudrant, Joseph; Dietrich, Jacques.
This work reports the first isolation and characterization of an alkaline phosphatase (AP) from a hyperthermophilic archaeon. An AP gene from Pyrococcus abyssi, a euryarchaeon isolated from a deep-sea hydrothermal vent, was cloned and the enzyme expressed in Escherichia coli. Analysis of the sequence showed conservation of the active site and structural elements of the E. coli AP. The recombinant AP was purified and characterized. Monomeric and homodimeric active forms were detected, with a monomer molecular mass of 54 kDa. Apparent optimum pH and temperature were estimated at 11.0 and 70 degreesC, respectively. Thus far, P. abyssi AP has been demonstrated to be the most thermostable AP, with half-lives at 100 and 105 degreesC of 18 and 5 h, respectively....
Tipo: Text
Palavras-chave: Escherichia coli; Characterization; Isolation; Gene; Alkaline phosphatase; Pyrococcus abyssi; Archaeon.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-1268.pdf

Deferribacter autotrophicus sp nov., an iron(III)-reducing bacterium from a deep-sea hydrothermal vent
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Slobodkina, G. B.; Kolganova, T. V.; Chernyh, N. A.; Querellou, Joel; Bonch-osmolovskaya, E. A.; Slobodkin, A. I.
A thermophilic, anaerobic, chemolithoautotrophic bacterium (designated strain SL50(T)) was isolated from a hydrothermal sample collected at the Mid-Atlantic Ridge from the deepest of the known World ocean hydrothermal fields, Ashadze field (12 degrees 58' 21 '' N 44 degrees 51' 47 '' W) at a depth of 4100 m. Cells of strain SL50(T) were motile, straight to bent rods with one polar flagellum, 0.5-0.6 mu m in width and 3.0-3.5 mu m in length. The temperature range for growth was 25-75 degrees C, with an optimum at 60 degrees C. The pH range for growth was 5.0-7.5, with an optimum at pH 6.5. Growth of strain SL50(T) was observed at NaCl concentrations ranging from 1.0 to 6.0% (w/v) with an optimum at 2.5 % (w/v). The generation time under optimal growth...
Tipo: Text
Palavras-chave: Thermophile; Archaeon.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6598.pdf