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- W2893724706 abstract "Limited knowledge on the exact functions of ergostane-based sterols has hampered the application of sterol synthesis inhibitors against trypanosomatid parasites. Sterol methyltransferase (SMT) is directly involved in the synthesis of parasite-specific C24-methylated sterols, including ergosterol and 5-dehydroepisterol. While pharmacological studies hint at its potential as a drug target against trypanosomatids, direct evidence for the cellular function and essentiality of SMT is lacking. Here, we characterized the SMT knockout mutants and their complemented strains in Leishmania major, the causative agent for cutaneous leishmaniasis. Deletion of SMT alleles led to a complete loss of C24-methylated sterols, which were replaced by cholestane-based sterols. SMT-null mutants were fully viable and replicative in culture but showed increased sensitivity to sphingolipid synthesis inhibition. They were not particularly vulnerable to heat, acidic pH, nitrosative or oxidative stress, yet exhibited high mitochondrial membrane potential and increased superoxide generation indicating altered physiology of the mitochondria. Despite possessing high levels of GPI-anchored glycoconjugates, SMT-null mutants showed significantly attenuated virulence in mice. In total, our study reveals that the biosynthesis of ergostane-based sterols is crucial for the proper function of mitochondria and the proliferation of Leishmania parasites in mammals." @default.
- W2893724706 created "2018-10-05" @default.
- W2893724706 creator A5003850660 @default.
- W2893724706 creator A5038207517 @default.
- W2893724706 creator A5046541656 @default.
- W2893724706 creator A5062476988 @default.
- W2893724706 creator A5077384811 @default.
- W2893724706 creator A5081213858 @default.
- W2893724706 date "2018-10-21" @default.
- W2893724706 modified "2023-10-18" @default.
- W2893724706 title "Sterol methyltransferase is required for optimal mitochondrial function and virulence in<i>Leishmania major</i>" @default.
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