AI Article Synopsis
- Ustilago maydis sporidia treated with azasterol showed noticeable changes like branching and vacuolation after 6 hours.
- During the first 3 hours, sporidial growth and the synthesis of proteins, DNA, and RNA were only mildly affected, but treated sporidia exhibited increased levels of free fatty acids.
- Azasterol completely inhibited ergosterol synthesis within an hour, leading to a buildup of its intermediate, indicating that its toxicity is linked to specific disruption in sterol reduction.
Article Abstract
Ustilago maydis sporidia treated with 0.1 mug of azasterol (15-aza-24-methylene-d-homocholesta-8,14-dien-3beta-ol) per ml appeared branched and vacuolated after 6 h of incubation. Sporidial multiplication, dry weight increase, and synthesis of protein, deoxyribonucleic acid, and ribonucleic acid were only slightly or moderately inhibited during the initial 3 h of incubation. An increase of free fatty acids was observed in lipid extracts of treated sporidia after incubation for 3 h or more. Ergosterol synthesis was completely inhibited within 1 h and there was a gradual decline of ergosterol content during 6 h which was accompanied by an accumulation of the sterol intermediate ergosta-8,14-dien-3beta-ol. The results indicate that toxicity of the azasterol results from specific inhibition of the reduction of the sterol C-14(15) double bond. A triarimol-tolerant strain of Cladosporium cucumerinum was tolerant to the azasterol, but an imazalil-tolerant strain of Aspergillus nidulans was not.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC352793 | PMC |
| http://dx.doi.org/10.1128/AAC.16.1.81 | DOI Listing |
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