The human cathelicidin peptide LL-37 and truncated variants induce segregation of lipids and proteins in the plasma membrane of Candida albicans
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Alice L. den Hertog
Abstract
The human cathelicidin peptide LL-37 and several truncated variants differ in their capability to transmigrate over the plasma membrane of Candida albicans. We investigated whether retention at the cell perimeter or membrane transmigration affects their membrane-disrupting activities and candidacidal properties. Using fluorescein-labeled peptides, we demonstrate that LL-37 and its C-terminally truncated peptide LL-31 remain permanently associated with the perimeter of the cell. The N-terminally truncated peptide RK-31 initially accumulated at the cell boundary, but transmigrated into the cytoplasm within 30 min. The C-terminally truncated peptide LL-25 transmigrated instantaneously into the cytoplasm. The ultrastructural effects on the plasma membrane were studied by freeze-fracture electron microscopy combined with filipin cytochemistry. All peptides, whether they transmigrated over the plasma membrane or not, induced phase separation in the plasma membrane. All peptides induced leakage of cell components, including nucleotides and proteins. Proteins were identified by SDS-PAGE in combination with mass spectrometry, which revealed that predominantly proteins smaller than 50 kDa had leaked out of C. albicans.
References
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©2006 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Highlight: Redox signaling – mechanisms and biological impact
- Paper of the Year 2005: Award to Vanessa Ferreira Merino
- Two-site substrate recognition model for the Keap1-Nrf2 system: a hinge and latch mechanism
- Hypoxia and lipid signaling
- Glutathione peroxidases and redox-regulated transcription factors
- Redox regulation of the hypoxia-inducible factor
- The l-arginine nitric oxide pathway: avenue for a multiple-level approach to assess vascular function
- Protein oxidation and proteolysis
- Mitochondrial signaling, TOR, and life span
- Pathogenetic interplay between osmotic and oxidative stress: the hepatic encephalopathy paradigm
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- Incinerator fly ash provokes alteration of redox equilibrium and liberation of arachidonic acid in vitro
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- The β12-β13 loop is a key regulatory element for the activity and properties of the catalytic domain of protein phosphatase 1 and 2B
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- Papaya glutamine cyclotransferase shows a singular five-fold β-propeller architecture that suggests a novel reaction mechanism
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- The human cathelicidin peptide LL-37 and truncated variants induce segregation of lipids and proteins in the plasma membrane of Candida albicans
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Articles in the same Issue
- Highlight: Redox signaling – mechanisms and biological impact
- Paper of the Year 2005: Award to Vanessa Ferreira Merino
- Two-site substrate recognition model for the Keap1-Nrf2 system: a hinge and latch mechanism
- Hypoxia and lipid signaling
- Glutathione peroxidases and redox-regulated transcription factors
- Redox regulation of the hypoxia-inducible factor
- The l-arginine nitric oxide pathway: avenue for a multiple-level approach to assess vascular function
- Protein oxidation and proteolysis
- Mitochondrial signaling, TOR, and life span
- Pathogenetic interplay between osmotic and oxidative stress: the hepatic encephalopathy paradigm
- Regulation of redox-sensitive exofacial protein thiols in CHO cells
- N-Ethylmaleimide-sensitive factor: a redox sensor in exocytosis
- Aspects of the biological redox chemistry of cysteine: from simple redox responses to sophisticated signalling pathways
- Singlet oxygen inactivates protein tyrosine phosphatase-1B by oxidation of the active site cysteine
- Regulatory effects of the mitochondrial energetic status on mitochondrial p66Shc
- Air pollution-associated fly ash particles induce fibrotic mechanisms in primary fibroblasts
- Incinerator fly ash provokes alteration of redox equilibrium and liberation of arachidonic acid in vitro
- Unique neuronal functions of cathepsin L and cathepsin B in secretory vesicles: biosynthesis of peptides in neurotransmission and neurodegenerative disease
- Two novel mitochondrial and chloroplastic targeting-peptide-degrading peptidasomes in A. thaliana, AtPreP1 and AtPreP2
- Switch from actin α1 to α2 expression and upregulation of biomarkers for pressure overload and cardiac hypertrophy in taurine-deficient mouse heart
- Human RBM28 protein is a specific nucleolar component of the spliceosomal snRNPs
- The β12-β13 loop is a key regulatory element for the activity and properties of the catalytic domain of protein phosphatase 1 and 2B
- DNA-binding properties of the recombinant high-mobility-group-like AT-hook-containing region from human BRG1 protein
- Papaya glutamine cyclotransferase shows a singular five-fold β-propeller architecture that suggests a novel reaction mechanism
- First identification of a phosphorylcholine-substituted protein from Caenorhabditis elegans: isolation and characterization of the aspartyl protease ASP-6
- The human cathelicidin peptide LL-37 and truncated variants induce segregation of lipids and proteins in the plasma membrane of Candida albicans
- Specificity of human cathepsin S determined by processing of peptide substrates and MHC class II-associated invariant chain
- Mast cell-dependent activation of pro matrix metalloprotease 2: a role for serglycin proteoglycan-dependent mast cell proteases