Spectroscopic and thermodynamic properties of Debaryomyces hansenii UFV-1 alpha-galactosidases.
Int J Biol Macromol
; 46(3): 298-303, 2010 Apr 01.
Article
em En
| MEDLINE
| ID: mdl-20083135
ABSTRACT
Spectroscopic and thermodynamic properties were determined for Debaryomyces hansenii UFV-1 extracellular and intracellular alpha-galactosidases. alpha-Galactosidases showed similar secondary structure compositions (alpha-helix, beta-sheet parallel and beta-turn). Effects of pH and temperature on the structure of alpha-galactosidases were investigated using circular dichroism spectroscopy. It was more pronounced at low pH. Microcalorimetry was employed for the determination of thermodynamic parameters. Immediate thermal denaturation reversibility was not observed for alpha-galactosidases; it occurred as a thermodynamically driven process. Extracellular alpha-galactosidase, at pH 5.5, showed lower T(m) when compared to the intracellular enzyme. The CD and DSC data suggest that D. hansenii alpha-galactosidases have different behaviors although they possess some similar secondary structures.
Texto completo:
1
Tema:
Geral
Bases de dados:
MEDLINE
Assunto principal:
Dicroísmo Circular
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Alfa-Galactosidase
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Debaryomyces
Idioma:
En
Revista:
Int J Biol Macromol
Ano de publicação:
2010
Tipo de documento:
Article