1d7n
From Proteopedia
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|PDB= 1d7n |SIZE=350|CAPTION= <scene name='initialview01'>1d7n</scene> | |PDB= 1d7n |SIZE=350|CAPTION= <scene name='initialview01'>1d7n</scene> | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=NH2:AMINO GROUP'>NH2</scene> | + | |LIGAND= <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1d7n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1d7n OCA], [http://www.ebi.ac.uk/pdbsum/1d7n PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1d7n RCSB]</span> | ||
}} | }} | ||
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[[Category: Iwadate, M.]] | [[Category: Iwadate, M.]] | ||
[[Category: Niidome, T.]] | [[Category: Niidome, T.]] | ||
| - | [[Category: NH2]] | ||
[[Category: immune system]] | [[Category: immune system]] | ||
[[Category: sodium dodecyl sulfate bound conformation]] | [[Category: sodium dodecyl sulfate bound conformation]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:36:15 2008'' |
Revision as of 16:36, 30 March 2008
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| Ligands: | |||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
SOLUTION STRUCTURE ANALYSIS OF THE MASTOPARAN WITH DETERGENTS
Overview
Several complementary NMR approaches were used to study the interaction of mastoparan, a 14-residue peptide toxin from wasp venom, with lipid membranes. First, the 3D structure of mastoparan was determined using 1H-NMR spectroscopy in perdeuterated (SDS-d25) micelles. NOESY experiments and distance geometry calculations yielded a straight amphiphilic alpha-helix with high-order parameters, and the chemical shifts of the amide protons showed a characteristic periodicity of 3-4 residues. Secondly, solid-state 2H-NMR spectoscopy was used to describe the binding of mastoparan to lipid bilayers, composed of headgroup-deuterated dimyristoylglycerophosphocholine (DMPC-d4) and dimyristoylphosphatidylglycerol (DMPG). By correlating the deuterium quadrupole splittings of the alpha-segments and beta-segments, it was possible to differentiate the electrostatically induced structural response of the choline headgroup from dynamic effects induced by the peptide. A partial phase separation was observed, leading to a DMPG-rich phase and a DMPG-depleted phase, each containing some mastoparan. Finally, the insertion and orientation of a specifically 15N-labeled mastoparan (at position Ala10) in the bilayer environment was investigated by solid-state 15N-NMR spectroscopy, using macroscopically oriented samples. Two distinct orientational states were observed for the mastoparan helix, namely an in-plane and a trans-membrane alignment. The two populations of 90% in-plane and 10% trans-membrane helices are characterized by a mosaic spread of +/- 30 degrees and +/- 10 degrees, respectively. The biological activity of mastoparan is discussed in terms of a pore-forming model, as the peptide is known to be able to induce nonlamellar phases and facilitate a flip-flop between the monolayers.
About this Structure
1D7N is a Single protein structure of sequence from Vespula lewisii. Full crystallographic information is available from OCA.
Reference
Interaction of mastoparan with membranes studied by 1H-NMR spectroscopy in detergent micelles and by solid-state 2H-NMR and 15N-NMR spectroscopy in oriented lipid bilayers., Hori Y, Demura M, Iwadate M, Ulrich AS, Niidome T, Aoyagi H, Asakura T, Eur J Biochem. 2001 Jan;268(2):302-9. PMID:11168364
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