A blasticidin S-resistant Plasmodium falciparum mutant with a defective plasmodial surface anion channel
| Autor: | Lanxuan Doan, Godfrey Lisk, David A. Hill, Karen Hayton, Ajay Pillai, Sanjay A. Desai, Fatima Nawaz |
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| Rok vydání: | 2007 |
| Předmět: |
Cell Membrane Permeability
Patch-Clamp Techniques Time Factors Multidisciplinary biology Intracellular parasite Plasmodium falciparum Mutant Drug Resistance Nucleosides Gating Biological Sciences biology.organism_classification Ion Channels In vitro Cell biology Blasticidin S Electrophysiology chemistry.chemical_compound Biochemistry chemistry Animals Gene Ion channel |
| Zdroj: | Proceedings of the National Academy of Sciences. 104:1063-1068 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.0610353104 |
| Popis: | Erythrocytes infected with malaria parasites exhibit marked increases in permeability to organic and inorganic solutes. The plasmodial surface anion channel (PSAC), an unusual voltage-dependent ion channel induced on the host membrane after infection, may play a central role in these permeability changes. Here, we identified a functional PSAC mutant through in vitro selection with blasticidin S. Resistance to blasticidin S was generated during culture and correlated with significant reductions in permeability to multiple solutes, consistent with uptake via a common pathway. Single channel recordings revealed marked changes in PSAC gating with the addition of a subconductance state not present in wild-type channels. The channel's selectivity profile and pharmacology also were significantly altered. Eventual loss of the mutant phenotype upon removal of selective pressure and slower growth of mutant parasites suggest that PSAC serves an important role in intracellular parasite survival. These findings provide solid evidence for the uptake of diverse solutes via PSAC and implicate one or more parasite genes in expression of this channel. |
| Databáze: | OpenAIRE |
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