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| | ==Solution structure of piscidin in presence of DPC micelles== | | ==Solution structure of piscidin in presence of DPC micelles== |
| - | <StructureSection load='2jos' size='340' side='right'caption='[[2jos]], [[NMR_Ensembles_of_Models | 10 NMR models]]' scene=''> | + | <StructureSection load='2jos' size='340' side='right'caption='[[2jos]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2jos]] is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JOS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2JOS FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2jos]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Morone_saxatilis Morone saxatilis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JOS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2JOS FirstGlance]. <br> |
| | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2jos FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2jos OCA], [https://pdbe.org/2jos PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2jos RCSB], [https://www.ebi.ac.uk/pdbsum/2jos PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2jos ProSAT]</span></td></tr> | | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2jos FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2jos OCA], [https://pdbe.org/2jos PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2jos RCSB], [https://www.ebi.ac.uk/pdbsum/2jos PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2jos ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/MORO_MORSA MORO_MORSA]] Exhibits broad spectrum antimicrobial activity against Gram-positive and Gram-negative bacteria as well as against a variety of fungi. Has hemolytic activity. Seems to disrupt the membranes by adopting an alpha helical conformation and forming toroidal pores.<ref>PMID:11713517</ref> <ref>PMID:17253775</ref>
| + | [https://www.uniprot.org/uniprot/MORO_MORSA MORO_MORSA] Exhibits broad spectrum antimicrobial activity against Gram-positive and Gram-negative bacteria as well as against a variety of fungi. Has hemolytic activity. Seems to disrupt the membranes by adopting an alpha helical conformation and forming toroidal pores.<ref>PMID:11713517</ref> <ref>PMID:17253775</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Aumelas, A]] | + | [[Category: Morone saxatilis]] |
| - | [[Category: Campagna, S]] | + | [[Category: Aumelas A]] |
| - | [[Category: Molle, G]] | + | [[Category: Campagna S]] |
| - | [[Category: Saint, N]] | + | [[Category: Molle G]] |
| - | [[Category: Amphipathic helix]]
| + | [[Category: Saint N]] |
| - | [[Category: Antimicrobial]]
| + | |
| - | [[Category: Antimicrobial protein]]
| + | |
| - | [[Category: Micellar environment]]
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| - | [[Category: Piscidin]]
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| Structural highlights
Function
MORO_MORSA Exhibits broad spectrum antimicrobial activity against Gram-positive and Gram-negative bacteria as well as against a variety of fungi. Has hemolytic activity. Seems to disrupt the membranes by adopting an alpha helical conformation and forming toroidal pores.[1] [2]
Publication Abstract from PubMed
Piscidin, an antibacterial peptide isolated from the mast cells of striped bass, has potent antimicrobial activity against a broad spectrum of pathogens in vitro. We investigated the mechanism of action of this 22-residue cationic peptide by carrying out structural studies and electrophysiological experiments in lipid bilayers. Circular dichroism experiments showed that piscidin was unstructured in water but had a high alpha-helix content in dodecylphosphocholine (DPC) micelles. 1H NMR data in water and TFE confirmed these results and demonstrated that the segment of residues 8-17 adopted an alpha-helical structure in a micellar environment. This molecule has a marked amphipathic character, due to well-defined hydrophobic and hydrophilic sectors. This structure is similar to those determined for other cationic peptides involved in permeabilization of the bacterial membrane. Multichannel experiments with piscidin incorporated into azolectin planar bilayers gave reproducible I-V curves at various peptide concentrations and unambiguously showed that this peptide permeabilized the membrane. This pore forming activity was confirmed by single-channel experiments, with well-defined ion channels obtained at different voltages. The characteristics of the ion channels (voltage dependence, only one or two states of conductance) clearly suggest that piscidin is more likely to permeabilize the membrane by toroidal pore formation rather than via the "barrel-stave" mechanism.
Structure and mechanism of action of the antimicrobial peptide piscidin.,Campagna S, Saint N, Molle G, Aumelas A Biochemistry. 2007 Feb 20;46(7):1771-8. Epub 2007 Jan 25. PMID:17253775[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Silphaduang U, Noga EJ. Peptide antibiotics in mast cells of fish. Nature. 2001 Nov 15;414(6861):268-9. PMID:11713517 doi:http://dx.doi.org/10.1038/35104690
- ↑ Campagna S, Saint N, Molle G, Aumelas A. Structure and mechanism of action of the antimicrobial peptide piscidin. Biochemistry. 2007 Feb 20;46(7):1771-8. Epub 2007 Jan 25. PMID:17253775 doi:10.1021/bi0620297
- ↑ Campagna S, Saint N, Molle G, Aumelas A. Structure and mechanism of action of the antimicrobial peptide piscidin. Biochemistry. 2007 Feb 20;46(7):1771-8. Epub 2007 Jan 25. PMID:17253775 doi:10.1021/bi0620297
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