Abstract:
:Two red Cystofilobasidium spp. isolated from spring sap-flows of Betula pendula were analysed for their carotenoid content. In Cystofilobasidium infirmominiatum, 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 as postulated biosynthetic intermediates en route to torularhodin. Unprecedented formation of beta-apo-2'-carotenal was also observed. The production 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 microM 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 carotenoid oxidation in red yeasts, was not produced by either species under any incubation conditions. Biosynthetic aspects of incomplete oxidation of torulene by these Cystofilobasidium spp. are discussed.
journal_name
Phytochemistryjournal_title
Phytochemistryauthors
Herz S,Weber RW,Anke H,Mucci A,Davoli Pdoi
10.1016/j.phytochem.2007.05.019subject
Has Abstractpub_date
2007-10-01 00:00:00pages
2503-11issue
20eissn
0031-9422issn
1873-3700pii
S0031-9422(07)00334-2journal_volume
68pub_type
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