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Haloferax mediterraneiproteasa extracelular, serin-proteasa. Experientia, 29 In addition, the Hf. A large improvement in enzyme recovery was achieved when the chromatography was carried out in a column equilibrated with 2.

Thus, it may be concluded that the most important cations for Hf. We may ascribe that failure to inappropriate experimental conditions to preserve enzyme activity. The halobacteria in particular, which are organisms usually found in habitats where the salt concentration is higher than sea water [], seem to be able to produce a number of metabolites and polymers such as polyhydroxybutirate PHB [5], sulfated polysaccharides [6], and cell wall components [7], of industrial and biomedical interest.

This characteristic imposes many restrictions in their detection and crmatografia the choice of an appropriate purification technique. Materials and methods All chemicals and reagents were analytical grade Sigma, Chem.

The new concentrated material was designated as CS Biochemistry15 This denaturation is irreversible, as observed also with other halophilic archaebacteria [36, 38, 39]. The technique has been successfully applied, for example, by Kamekura and Seno [39] who were able to purify an extracellular protease from an unidentified strain of a halophilic archaebacterium on Butyl Toyopearl and Phenyl Sepharose.


Because the employed electrophoresis conditions are known to promote protein disgregation, and because only one protein band in the gel was observed, we have concluded that the extracellular protease of Hf.

Stability of extracellular protease activity in different crommatografia conditions.

PURIFICACIÓN by Nicole Elenter on Prezi

Biopolymer production by Haloferax mediterranei. Business Centre for Academic Societies, Japan.

Comparative Biochemistry hidrofoblca Physiology. The halophilic microorganisms, represented by the halobacteria extremely halophilic aerobic Archaeabacteriathe moderate halophiles bacteria and some methanogensand several eukaryotic algae, and their products, have been a research subject in modern biotechnology [1].

The maximum recovered activity assayed at 2. After washing the column with 2 volumes of starting buffer, a decreasing linear gradient of NaCl from 2.

Also the concentration of ammonium ions affected cell growth and the extracellular enzyme activity of Hf. Recibido el 16 de enero del cromatograria Hence, the traditional salting-out protein purification and concentration procedure cannot be applied in this case. 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. Extremophiles4 For example, without sodium ions, a complete loss of enzyme activity was noticed Table 2.

Study of proteases of marine bacteria: Aceptado el 27 de mayo del Ion-specificity requirements for Hf. To determine the optimum NaCl concentration hidrofobic for CS protease stability, two different experiments were carried out: Although some halophilic enzymes may be reactivated from the salt-free solutions [21, interaccjon, and this facilitates their purification using standard methods, i. Mediterranei to different kinds of salts, including ammonium sulfate, resulted in a considerable loss of interaccuon.


Accordingly, one enzyme unit is defined as the amount required to cause an increase in absorption of 0. This treatment evidenced the enzyme instability at low salt concentration and led us to consider the addition of salt to preserve activity whenever required.

Being aware of the advantages offered by Hydrophobic Interaction Chromatography, a technique that allows the use of a high salt concentration to favor a selective adsorption of the protein on the basis of its hydrophobicity [35], we decided to explore its application in the isolation hierofobica the extracellular enzyme responsible of the proteolytic activity shown by Hf.

Cromatografía de afinidade – Wikipedia, a enciclopedia libre

To date, several enzymes from Hf. Nevertheless, there are some halophilic proteases, like the one from Hb. Hence, the following experiments were run with 0. As with most halophilic enzymes, the extracellular proteolytic activity of Hf. Once established, we were able to introduce the following method for its isolation and purification: Electrophoresis was done at a constant voltage V interaccipn the tracking dye bromophenol blue reached 1 cm from the bottom of the gel.

Cromatografía de afinidade

Haloferax mediterraneiextracellular, protease, serine-proteases. Elena Irma Villarreal Moguel, and Dr. Effect of salt concentration on CS proteolytic activity.

All steps were done at room temperature as follows: Like the P1 protease [39], Hf.