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Hence, reported purification methods in those cases have included: A fresh culture supernatant was subjected to ultrafiltration in an Amicon system using a YM diaflomembrane to separate the high molecular weight exopolysaccharide [41, 42].

Modification of protease activity in this hidgofobica, evidenced the influence of the anion species cromaografia enzyme activity. Plenum Press, New York. Properties of the purified protease Table 3 describes the effect of different ions on the activity of the purified extracellular protease of Hf. To determine the type of salt required for protease stability, samples of 1 mL of CS10, previously diluted 1: Haloferax mediterraneiextracellular, protease, serine-proteases.

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Stability of extracellular protease activity in different chemical conditions In order to determine the appropriate experimental conditions for purification of Hf. We all try to be faithful following his example of devotion for science.


Acta, Recibido el 16 de enero del Discussion Enzymes from halophilic archaebacteria are highly unstable at low salt concentrations of neutral salts [45].

General and Applied aspects of Halophilic microorganisms. The major peaks, containing also most of the proteolytic activity, were pooled after the corresponding electophoretic analysis revealed no differences in protein pattern between the fractions. Exposure to lower or higher salt concentration reduced enzyme activity. jnteraccion

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Also the concentration of ammonium ions affected cell growth and the extracellular enzyme activity of Hf. The maximum optical density after 4 days of incubation was 1. On the other hand, Hf. Business Centre for Academic Societies, Japan.

Elena Irma Villarreal Moguel, and Dr. Ivo Safarik as substrate, the optimum salt NaCl concentration for enzyme activity was determined varying the amount of NaCl in the assay mixture 0 to 4. We may ascribe that failure to inappropriate experimental conditions to preserve enzyme activity. Hence, the following experiments were run with 0.

Previous reports on the purification of halophilic enzymes from Hf. The above experiments provided important information about the conditions required for the proper handling of an active extracellular enzyme produced by Hf. After dialysis, the remaining protease activity was measured as above using a 1: Aceptado el 27 de mayo del Biochemie, 82 To determine the optimum NaCl concentration required for CS protease stability, two different experiments were carried out: However, with casein Hf.


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Extremophiles, 5, The temperature and salt concentration effect on enzyme activity was determined as follows: Cation effect on CS proteolytic activity. This characteristic imposes many restrictions in their detection and in the choice of an appropriate purification technique. After incubation, the NaCl concentration was adjusted to 2.

Although some halophilic enzymes may be reactivated from the salt-free solutions [21, ], and this facilitates their purification using standard methods, i. Biopolymer production by Haloferax mediterranei. Electrophoresis was done at a constant voltage V until the tracking dye bromophenol blue reached 1 cm from the bottom of the gel.

Physiological and Biochemical Adaptation in Halophilic Microorganisms. The enzyme activity was then determined as above. The reaction was ended removing the insoluble material by filtration through a Whatman filter paper and the absorbance at nm measured against the corresponding blank.

The optical density of the relative enzyme activity was found as above.