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Título del libro: Microbes In Applied Research: Current Advances And Challenges, Malaga, Spain, 14 - 16 September 2011
Título del capítulo: Carotenogenesis induction with hydrogen peroxide in xanthophyllomyces dendrorhous colored mutants

Autores UNAM:
CESAR MATEO FLORES ORTIZ;
Autores externos:

Idioma:
Inglés
Año de publicación:
2012
Palabras clave:

Astaxanthin; Carotenoids; Oxidative stress


Resumen:

Xanthophyllomyces dendrorhous synthesizes astaxanthin as the most representative xanthophyll derivative. This compound displays antioxidant properties and its production has been stimulated via reactive oxygen species (ROS). Detailed mechanisms for carotenogenesis in X. dendrorhous have not been elucidated. Carotenoid production was stimulated with H2O2 in X. dendrorhous wild type (Wt), mutants R4 (red, astaxanthin hyperproducer); W10 (white, accumulates phytoene); Y21 (yellow, accumulates ?-carotene) and P26 (pink, accumulates monocyclic carotenoids), to identify important biosynthetic steps in this microorganism. Addition of H2O2 prolonged the lag phase in all strains but reached similar growth at the stationary phase as that observed for their own control culture. The addition of H2O2 increased the carotenoid contents in 16 % for Wt and R4, 60 % in W10 and Y21 mutants, while in P26 this parameter remained constant. The results reported herein suggest that carotenogenesis induction by H2O2 may occur before the ?-carotene step formation and its oxygenation is a limiting step in the astaxanthin formation pathway in X. dendrorhous. © 2012 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.


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