Two red Cystofilobasidium spp. isolated from spring sap-flows of Betula pendula were analysed for their carotenoid content. In Cystofilobasidiuminfirmominiatum, three unusual pigments were detected and identified by structure elucidation as oxidised torulene derivatives.These included 16'-hydroxytorulene and torularhodinaldehyde, two carotenoids known so far only from chemical synthesis or aspostulated biosynthetic intermediates en route to torularhodin. Unprecedented formation of beta-apo-2'-carotenal was also observed. Theproduction of these pigments in pure culture was dependent on enhanced oxidative stress caused by cultivation in well-aerated (indented)flasks with or without 2% ethanol (16'-hydroxytorulene), or with 100 lM duroquinone (torularhodinaldehyde and beta-apo-2'-carotenal).Among these three pigments, only 16'-hydroxytorulene was detected in C. capitatum. Torularhodin, a common end product of carotenoidoxidation in red yeasts, was not produced by either species under any incubation conditions. Biosynthetic aspects of incompleteoxidation of torulene by these Cystofilobasidium spp. are discussed.
|Data di pubblicazione:||2007|
|Titolo:||Intermediates in the oxidative pathway from torulene to torularhodin in the red yeasts Cystofilobasidium infirmominiatum and C. capitatum (Heterobasidiomycetes, Fungi)|
|Autori:||S. HERZ; R. W. S. WEBER; H. ANKE; A. MUCCI; P. DAVOLI|
|Digital Object Identifier (DOI):||10.1016/j.phytochem.2007.05.019|
|Appare nelle tipologie:||Articolo su rivista|
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