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Title:BIOLOŠKO AKTIVNI METABOLITI EKSTREMOFILNIH GLIVNIH VRST IZ RODU Wallemia: IZOLACIJA, STRUKTURA IN BIOLOŠKA AKTIVNOST
Authors:ID Tanja, Botić (Author)
ID Knez, Željko (Mentor) More about this mentor... New window
ID Sepčić, Kristina (Comentor)
Files:.pdf DR_Botic_Tanja_2012.pdf (1,79 MB)
MD5: 5A475FC67AC53D01B3E309982EA13A01
PID: 20.500.12556/dkum/13763324-f388-4075-bcd3-9e41143465f5
 
Language:Slovenian
Work type:Dissertation
Organization:MF - Faculty of Medicine
Abstract:Rod Wallemia obsega tri vrste, Wallemia sebi, Wallemia ichthyophaga in Wallemia muriae. W. sebi je kserotolerofilna, ubikvitarna, z živili povezana mikotoksigena gliva, ki je bila do leta 2005 tudi edina znana vrsta omenjenega rodu. V dostopni literaturi je le skopo opisana biološka aktivnost mikotoksinov, ki jih omenjena vrsta producira zatorej smo v doktorski nalogi podrobneje raziskali učinek izoliranih glivnih metabolitov iz vrst Wallemia na rdeče krvne celice, kakšno afiniteto izkazujejo do umetnih lipidnih veziklov ter tudi identificirali njihovo kemijsko strukturo. Ekstrakti, pridobljeni iz glivne biomase W. sebi s pomočjo kloroforma, superkritičnega CO2 in etanola, so izkazovali močno hemolitično aktivnost, ki je bila pri nižji vodni aktivnosti v rastnem gojišču glive večinoma izrazitejša. V testu litičnosti eritrocitov se je izkazalo, da je hemoliza odvisna od koncentracije etanolnega ekstrakta ter je močnejša v primeru bolj fluidnih membran. Analiza etanolnega ekstrakta in ekstrakta pridobljenega s superkritičnim CO2, opravljena s plinsko kromatografijo z masno spektrometričnim detektorjem je pokazala prisotnost mešanice sterolov in nenasičenih maščobnih kislin. Slednje smo potrdili kot povzročiteljice hemolize v biološkem testu. Litična aktivnost W. sebi kaže na potencialno vlogo izoliranih metabolitov pri tvorbi lezij ob subkutanih infekcijah, pri pljučih poljedelcev ter po zaužitju kontaminiranih živil, z glivo W. sebi. V doktorski nalogi se prvič omenja tudi produkcija hemolitično aktivnih metabolitov s strani drugih dveh vrst iz rodu Wallemia.
Keywords:rod Wallemia, Wallemia sebi, mikotoksini, hemolitično aktivni metaboliti, maščobne kisline
Place of publishing:Maribor
Year of publishing:2012
PID:20.500.12556/DKUM-22916 New window
COBISS.SI-ID:261873920 New window
NUK URN:URN:SI:UM:DK:QLSONM5D
Publication date in DKUM:09.08.2012
Views:3992
Downloads:396
Metadata:XML DC-XML DC-RDF
Categories:MF
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Secondary language

Language:English
Title:BIOLOGICALLY ACTIVE METABOLITES FROM EXTREMOPHILIC FUNGAL STRAINS OF GENUS Wallemia: ISOLATION, STRUCTURE AND BIOLOGICAL ACTIVITY
Abstract:Within genus Wallemia three species has been recognized, Wallemia sebi, Wallemia ichthyophaga and Wallemia muriae. W. sebi is a xerotolerant, ubiquitous, food-borne, mycotoxigenic fungus and till 2005 it was the only known species of the genus Wallemia. Since very limited data about biological activity of mycotoxins produced by W. sebi exist, research work aimed to explore in more details effect of isolated fungal metabolites obtained from Wallemia species onto red blood cells, the affinity towards artificial lipid vesicles and finally to identify their chemical structure. A chlorophorm, supercritical CO2 and ethanol extract of W. sebi mycelium demonstrated a strong hemolytic activity, which was in most cases enhanced at lower water activity of the growth medium. The lytic activity of the ethanol extract showed a concentration-dependent hemolysis and preferential activity towards lipid membranes with greater fluidity. Characterization of the ethanol extract and extract obtained using supercritical CO2 by gas chromatography–mass spectrometry revealed a mixture of sterols and unsaturated fatty acids. Latter were confirmed to be responsible for the hemolytic activity in the biological assay. The W. sebi lytic activity on mammalian erythrocytes shows its potential involvement in the formation of lesions in subcutaneous infections, in farmer's lung disease, and in consumption of contaminated food and feed with W. sebi. For the first time the production of biologically active metabolites by two other strains within genus Wallemia has been revealed.
Keywords:genus Wallemia, Wallemia sebi, mycotoxins, hemolytically active metabolites, fatty acids


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