1zy6
From Proteopedia
(New page: 200px<br /><applet load="1zy6" size="450" color="white" frame="true" align="right" spinBox="true" caption="1zy6" /> '''Membrane-bound dimer structure of Protegrin-...) |
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| - | [[Image:1zy6.gif|left|200px]]<br /><applet load="1zy6" size=" | + | [[Image:1zy6.gif|left|200px]]<br /><applet load="1zy6" size="350" color="white" frame="true" align="right" spinBox="true" |
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'''Membrane-bound dimer structure of Protegrin-1 (PG-1), a beta-Hairpin Antimicrobial Peptide in Lipid Bilayers from Rotational-Echo Double-Resonance Solid-State NMR'''<br /> | '''Membrane-bound dimer structure of Protegrin-1 (PG-1), a beta-Hairpin Antimicrobial Peptide in Lipid Bilayers from Rotational-Echo Double-Resonance Solid-State NMR'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The intermolecular packing of a beta-hairpin antimicrobial peptide, PG-1, in lipid bilayers is determined using solid-state NMR distance | + | The intermolecular packing of a beta-hairpin antimicrobial peptide, PG-1, in lipid bilayers is determined using solid-state NMR distance measurements. Previous spin counting experiments showed that PG-1 associates as dimers in POPC bilayers; however, the detailed dimer structure was unknown. We have now measured several intermolecular 13C-19F, 1H-13C, and 15N-13C distances in site-specifically labeled PG-1 to constrain the structure of the intermolecular interface. The distances are measured using the rotational-echo double-resonance (REDOR) technique under magic-angle spinning. The results indicate that two PG-1 molecules align in a parallel fashion with the C-terminal strand of the hairpin forming the dimer interface. Six hydrogen bonds stabilize this interface, and the Phe12 side chain adopts the g- conformation in the membrane as in solution. The parallel packing of the peptide in the lipid bilayer differs from the antiparallel dimer found in DPC micelles and may be stabilized by its strong amphipathic character, which should facilitate its insertion into the amphipathic lipid bilayer. This study demonstrates the utility of the REDOR NMR technique for the elucidation of the oligomeric structure of membrane proteins. |
==About this Structure== | ==About this Structure== | ||
| - | 1ZY6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ] with NH2 as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1ZY6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ] with <scene name='pdbligand=NH2:'>NH2</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZY6 OCA]. |
==Reference== | ==Reference== | ||
Membrane-bound dimer structure of a beta-hairpin antimicrobial peptide from rotational-echo double-resonance solid-state NMR., Mani R, Tang M, Wu X, Buffy JJ, Waring AJ, Sherman MA, Hong M, Biochemistry. 2006 Jul 11;45(27):8341-9. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16819833 16819833] | Membrane-bound dimer structure of a beta-hairpin antimicrobial peptide from rotational-echo double-resonance solid-state NMR., Mani R, Tang M, Wu X, Buffy JJ, Waring AJ, Sherman MA, Hong M, Biochemistry. 2006 Jul 11;45(27):8341-9. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16819833 16819833] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Buffy, J | + | [[Category: Buffy, J J.]] |
[[Category: Hong, M.]] | [[Category: Hong, M.]] | ||
[[Category: Mani, R.]] | [[Category: Mani, R.]] | ||
| - | [[Category: Sherman, M | + | [[Category: Sherman, M A.]] |
[[Category: Tang, M.]] | [[Category: Tang, M.]] | ||
| - | [[Category: Waring, A | + | [[Category: Waring, A J.]] |
[[Category: Wu, X.]] | [[Category: Wu, X.]] | ||
[[Category: NH2]] | [[Category: NH2]] | ||
| Line 23: | Line 23: | ||
[[Category: solid state nmr]] | [[Category: solid state nmr]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:20:13 2008'' |
Revision as of 14:20, 21 February 2008
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Membrane-bound dimer structure of Protegrin-1 (PG-1), a beta-Hairpin Antimicrobial Peptide in Lipid Bilayers from Rotational-Echo Double-Resonance Solid-State NMR
Overview
The intermolecular packing of a beta-hairpin antimicrobial peptide, PG-1, in lipid bilayers is determined using solid-state NMR distance measurements. Previous spin counting experiments showed that PG-1 associates as dimers in POPC bilayers; however, the detailed dimer structure was unknown. We have now measured several intermolecular 13C-19F, 1H-13C, and 15N-13C distances in site-specifically labeled PG-1 to constrain the structure of the intermolecular interface. The distances are measured using the rotational-echo double-resonance (REDOR) technique under magic-angle spinning. The results indicate that two PG-1 molecules align in a parallel fashion with the C-terminal strand of the hairpin forming the dimer interface. Six hydrogen bonds stabilize this interface, and the Phe12 side chain adopts the g- conformation in the membrane as in solution. The parallel packing of the peptide in the lipid bilayer differs from the antiparallel dimer found in DPC micelles and may be stabilized by its strong amphipathic character, which should facilitate its insertion into the amphipathic lipid bilayer. This study demonstrates the utility of the REDOR NMR technique for the elucidation of the oligomeric structure of membrane proteins.
About this Structure
1ZY6 is a Single protein structure of sequence from [1] with as ligand. Full crystallographic information is available from OCA.
Reference
Membrane-bound dimer structure of a beta-hairpin antimicrobial peptide from rotational-echo double-resonance solid-state NMR., Mani R, Tang M, Wu X, Buffy JJ, Waring AJ, Sherman MA, Hong M, Biochemistry. 2006 Jul 11;45(27):8341-9. PMID:16819833
Page seeded by OCA on Thu Feb 21 16:20:13 2008
Categories: Single protein | Buffy, J J. | Hong, M. | Mani, R. | Sherman, M A. | Tang, M. | Waring, A J. | Wu, X. | NH2 | Beta-hairpin | Solid state nmr
