CTAB, Triton X-100 and freezing-thawing treatments of Candida guilliermondii: Effects on permeability and accessibility of the glucose-6-phosphate dehydrogenase, xylose reductase and xylitol dehydrogenase enzymes


Autoria(s): Cortez, Daniela Vieira; Roberto, Ines Conceicao
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

05/11/2013

05/11/2013

2012

Resumo

Cells of Candida guilliermondii (ATCC 201935) were permeabilised with surfactant treatment (CTAB or Triton X-100) or a freezing-thawing procedure. Treatments were monitored by in situ activities of the key enzymes involved in xylose metabolism, that is, glucose-6-phosphate dehydrogenase (G6PD), xylose reductase (XR) and xylitol dehydrogenase (XD). The permeabilising ability of the surfactants was dependent on its concentration and incubation time. The optimum operation conditions for the permeabilisation of C. guilliermondii with surfactants were 0.41 mM (CTAB) or 2.78 mM (Triton X-100), 30 degrees C, and pH 7 at 200 rpm for 50 min. The maximum permeabilisation measured in terms of the in situ G6PD activity observed was, in order, as follows: CTAB (122.4 +/- 15.7 U/g(cells)) > freezing-thawing, , (54.3 +/- 1.9 U/g(cells)) > Triton X-100 (23.5 +/- 0.0 U/g(cells)). These results suggest that CTAB surfactant is more effective in the permeabilisation of C. guilliermondii cells in comparison to the freezing-thawing and Triton X-100 treatments. Nevertheless, freezing-thawing was the only treatment that allowed measurable in situ XR activity. Therefore, freezing-thawing permeabilised yeast cells could be used as a source of xylose reductase for analytical purposes or for use in biotransformation process such as xylitol preparation from xylose. The level of in situ xylose reductase was found to be 13.2 +/- 0.1 U/g(cells).

Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)

Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)

Identificador

NEW BIOTECHNOLOGY, AMSTERDAM, v. 29, n. 2, pp. 192-198, 2012

1871-6784

http://www.producao.usp.br/handle/BDPI/41385

10.1016/j.nbt.2011.05.011

http://dx.doi.org/10.1016/j.nbt.2011.05.011

Idioma(s)

eng

Publicador

ELSEVIER SCIENCE BV

AMSTERDAM

Relação

NEW BIOTECHNOLOGY

Direitos

closedAccess

Copyright ELSEVIER SCIENCE BV

Palavras-Chave #YEAST SACCHAROMYCES-CEREVISIAE #RESPONSE-SURFACE METHODOLOGY #ESCHERICHIA-COLI-CELLS #CETYLTRIMETHYLAMMONIUM BROMIDE #HEMICELLULOSIC HYDROLYZATE #RHODOTORULA-GRACILIS #BAKERS-YEAST #IN-SITU #HYDROLYSATE #CATALASE #BIOCHEMICAL RESEARCH METHODS #BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Tipo

article

original article

publishedVersion