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Stability of an extreme halophilic alkaline phosphatase from Halobacterium salinarium in non-conventional medium.

Authors
  • Marhuenda-Egea, F C
  • Piera-Velázquez, S
  • Cadenas, C
  • Cadenas, E
Type
Published Article
Journal
Journal of Biotechnology
Publisher
Elsevier
Publication Date
May 18, 2001
Volume
87
Issue
3
Pages
255–261
Identifiers
PMID: 11334667
Source
Medline
License
Unknown

Abstract

Alkaline p-nitrophenylphosphate phosphatase from the halophilic archaeon Halobacterium salinarum (earlier halobium) was solubilised in organic medium using reversed micelles of hexadecyltrimethylammonium bromide in cyclohexane, with 1-butanol as co-surfactant. The stability of alkaline p-nitrophenylphosphate phosphatase in this system was studied at different conditions, w(0) ([H(2)O]/[surfactant]), salt concentration, with and without Mn(+2). At all the conditions assayed, alkaline p-nitrophenylphosphate phosphatase was more stable in reversed micelles than in bulk aqueous solution (at 25 degrees C). The stabilisation effect of the reversed micelles was dramatic when the enzyme was dialysed against Mn(+2)-free buffer since the enzyme lost all the activity within 90 min in aqueous medium, but it retained approximately 72% of the initial enzymatic activity for 90 min in reversed micelles.

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