Ferrocenoyl Derivatives of Alamethicin: Redox-Sensitive Ion Channels
The synthesis and single-channel characterization of two redox-active C-terminal derivatives of alamethicin are herein described. The reduced [Fe(II)] forms of ferrocenoyl-alamethicin (Fc-ALM) and 1‘-carboxyferrocenoyl-alamethicin (cFc-ALM) are shown to form voltage-dependent ion channels at cis pos...
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Published in | Biochemistry (Easton) Vol. 36; no. 5; pp. 1115 - 1122 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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American Chemical Society
04.02.1997
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Abstract | The synthesis and single-channel characterization of two redox-active C-terminal derivatives of alamethicin are herein described. The reduced [Fe(II)] forms of ferrocenoyl-alamethicin (Fc-ALM) and 1‘-carboxyferrocenoyl-alamethicin (cFc-ALM) are shown to form voltage-dependent ion channels at cis positive potentials in planar lipid bilayers (PLB) with conductance properties similar to those of alamethicin. In situ oxidation of Fc-ALM [to Fe(III)] in the PLB apparatus causes a time-dependent elimination of channel openings, which can be restored by an increase in the transbilayer potential. In contrast, oxidation of cFc-ALM leads to the formation of shorter-lived channels. Pretreatment of the ferrocenoyl peptides with oxidizing agent alters their single-channel properties in a qualitatively similar manner, establishing that the changes in channel properties in the presence of oxidizing agents are due specifically to ferrocenoyl oxidation. We suggest that the redox sensitivity of these ferrocene-containing ion channels may be governed by a combination of the following factors: (1) changes in hydrophobicity; (2) alteration of peptide molecular dipole; and (3) alterations in tendencies toward self-association. However, oxidation induced changes in peptide conformation cannot be ruled out. Our results provide evidence that it is possible to engineer channel-forming peptides that respond to specific changes in the chemical environment. |
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AbstractList | The synthesis and single-channel characterization of two redox-active C-terminal derivatives of alamethicin are herein described. The reduced [Fe(II)] forms of ferrocenoyl-alamethicin (Fc-ALM) and 1‘-carboxyferrocenoyl-alamethicin (cFc-ALM) are shown to form voltage-dependent ion channels at cis positive potentials in planar lipid bilayers (PLB) with conductance properties similar to those of alamethicin. In situ oxidation of Fc-ALM [to Fe(III)] in the PLB apparatus causes a time-dependent elimination of channel openings, which can be restored by an increase in the transbilayer potential. In contrast, oxidation of cFc-ALM leads to the formation of shorter-lived channels. Pretreatment of the ferrocenoyl peptides with oxidizing agent alters their single-channel properties in a qualitatively similar manner, establishing that the changes in channel properties in the presence of oxidizing agents are due specifically to ferrocenoyl oxidation. We suggest that the redox sensitivity of these ferrocene-containing ion channels may be governed by a combination of the following factors: (1) changes in hydrophobicity; (2) alteration of peptide molecular dipole; and (3) alterations in tendencies toward self-association. However, oxidation induced changes in peptide conformation cannot be ruled out. Our results provide evidence that it is possible to engineer channel-forming peptides that respond to specific changes in the chemical environment. |
Author | Lunt, G. G Sansom, M. S. P Schmitt, Jeffrey D Kerr, I. D Eisenthal, R |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/9033402$$D View this record in MEDLINE/PubMed |
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Cites_doi | 10.1007/BF01869983 10.1016/0014-5793(94)00621-0 10.1021/j100161a070 10.1007/978-1-4899-1630-3 10.1002/jss.400020504 10.1152/physrev.1981.61.1.77 10.1021/jo01092a024 10.1016/0014-5793(89)80795-1 |
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Notes | istex:F9E2E4DFB98FCB897AE7942C9A89C946A5BE5D96 ark:/67375/TPS-JLD241LV-3 Abstract published in Advance ACS Abstracts, January 1, 1997. This work was supported by a grant from the Molecular Electronics Initiative of the Engineering and Physical Sciences Research Council of England (Grant GR-J02964) and by an Overseas Research Studentship and University of Bath Studentship (J.D.S.), and by a grant from the Wellcome Trust (M.S.P.S.). ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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Snippet | The synthesis and single-channel characterization of two redox-active C-terminal derivatives of alamethicin are herein described. The reduced [Fe(II)] forms of... |
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SubjectTerms | Alamethicin - analogs & derivatives Alamethicin - chemical synthesis Alamethicin - chemistry Amino Acid Sequence Electrochemistry Ferrous Compounds Indicators and Reagents Ion Channels Metallocenes Models, Chemical Molecular Sequence Data Oxidation-Reduction Structure-Activity Relationship |
Title | Ferrocenoyl Derivatives of Alamethicin: Redox-Sensitive Ion Channels |
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