1icy
From Proteopedia
(New page: 200px<br /><applet load="1icy" size="450" color="white" frame="true" align="right" spinBox="true" caption="1icy" /> '''[ALA31,PRO32]-PNPY BOUND TO DPC MICELLES'''<...) |
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| - | [[Image:1icy.jpg|left|200px]]<br /><applet load="1icy" size=" | + | [[Image:1icy.jpg|left|200px]]<br /><applet load="1icy" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1icy" /> | caption="1icy" /> | ||
'''[ALA31,PRO32]-PNPY BOUND TO DPC MICELLES'''<br /> | '''[ALA31,PRO32]-PNPY BOUND TO DPC MICELLES'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The structure of [Ala(31), Pro(32)]-NPY, a neuropeptide Y mutant with | + | The structure of [Ala(31), Pro(32)]-NPY, a neuropeptide Y mutant with selectivity for the NPY Y(5)-receptor (Cabrele, C., Wieland, H. A., Stidsen, C., Beck-Sickinger, A. G., (2002) Biochemistry XX, XXXX-XXXX (companion paper)), has been characterized in the presence of the membrane mimetic dodecylphosphocholine (DPC) micelles using high-resolution NMR techniques. The overall topology closely resembles the fold of the previously described Y(5)-receptor-selective agonist [Ala(31), Aib(32)]-NPY (Cabrele, C., Langer, M., Bader, R., Wieland, H. A., Doods, H. N., Zerbe, O., and Beck-Sickinger, A. G. (2000) J. Biol. Chem 275, 36043-36048). Similar to wild-type neuropeptide Y (NPY) and [Ala(31), Aib(32)]-NPY, the N-terminal residues Tyr(1)-Asp(16) are disordered in solution. Starting from residue Leu(17), an alpha helix extends toward the C-terminus. The decreased density of medium-range NOEs for the C-terminal residues resulting in larger RMSD values for the backbone atoms of Ala(31)-Tyr(36) indicates that the alpha helix has become interrupted through the [Ala(31), Pro(32)] mutation. This finding is further supported by (15)N-relaxation data through which we can demonstrate that the well-defined alpha helix is restricted to residues 17-31, with the C-terminal tetrapeptide displaying increased flexibility as compared to NPY. Surprisingly, increased generalized order parameter as well as decreased (3)J(HN)(alpha) scalar coupling constants reveal that the central helix is stabilized in comparison to wild-type NPY. Micelle-integrating spin labels were used to probe the mode of association of the helix with the membrane mimetic. The Y(5)-receptor-selective mutant and NPY share a similar orientation, which is parallel to the lipid surface. However, signal reductions due to efficient electron, nuclear spin relaxation were much less pronounced for the surface-averted residues in [Ala(31), Pro(32)]-NPY when compared to wild-type DPC-bound NPY. Only the signals of residues Asn(29) and Leu(30) were significantly more reduced in the mutant. The postulation of a different membrane binding mode of [Ala(31), Pro(32)]-NPY is further supported by the faster H/D exchange at the C-terminal amide protons. We conclude that arginine residues 33 and 35, which are believed to be directly involved in forming contacts to acidic receptor residues at the membrane-water interface, are no longer fixed in a well-defined conformation close to the membrane surface in [Ala(31), Pro(32)]-NPY. |
==About this Structure== | ==About this Structure== | ||
| - | 1ICY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa] with NH2 as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1ICY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa] 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=1ICY OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Sus scrofa]] | [[Category: Sus scrofa]] | ||
[[Category: Bader, R.]] | [[Category: Bader, R.]] | ||
| - | [[Category: Beck-Sickinger, A | + | [[Category: Beck-Sickinger, A G.]] |
[[Category: Lerch, M.]] | [[Category: Lerch, M.]] | ||
[[Category: Rytz, G.]] | [[Category: Rytz, G.]] | ||
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[[Category: y5 receptor selective npy mutant]] | [[Category: y5 receptor selective npy mutant]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:10:33 2008'' |
Revision as of 11:10, 21 February 2008
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[ALA31,PRO32]-PNPY BOUND TO DPC MICELLES
Overview
The structure of [Ala(31), Pro(32)]-NPY, a neuropeptide Y mutant with selectivity for the NPY Y(5)-receptor (Cabrele, C., Wieland, H. A., Stidsen, C., Beck-Sickinger, A. G., (2002) Biochemistry XX, XXXX-XXXX (companion paper)), has been characterized in the presence of the membrane mimetic dodecylphosphocholine (DPC) micelles using high-resolution NMR techniques. The overall topology closely resembles the fold of the previously described Y(5)-receptor-selective agonist [Ala(31), Aib(32)]-NPY (Cabrele, C., Langer, M., Bader, R., Wieland, H. A., Doods, H. N., Zerbe, O., and Beck-Sickinger, A. G. (2000) J. Biol. Chem 275, 36043-36048). Similar to wild-type neuropeptide Y (NPY) and [Ala(31), Aib(32)]-NPY, the N-terminal residues Tyr(1)-Asp(16) are disordered in solution. Starting from residue Leu(17), an alpha helix extends toward the C-terminus. The decreased density of medium-range NOEs for the C-terminal residues resulting in larger RMSD values for the backbone atoms of Ala(31)-Tyr(36) indicates that the alpha helix has become interrupted through the [Ala(31), Pro(32)] mutation. This finding is further supported by (15)N-relaxation data through which we can demonstrate that the well-defined alpha helix is restricted to residues 17-31, with the C-terminal tetrapeptide displaying increased flexibility as compared to NPY. Surprisingly, increased generalized order parameter as well as decreased (3)J(HN)(alpha) scalar coupling constants reveal that the central helix is stabilized in comparison to wild-type NPY. Micelle-integrating spin labels were used to probe the mode of association of the helix with the membrane mimetic. The Y(5)-receptor-selective mutant and NPY share a similar orientation, which is parallel to the lipid surface. However, signal reductions due to efficient electron, nuclear spin relaxation were much less pronounced for the surface-averted residues in [Ala(31), Pro(32)]-NPY when compared to wild-type DPC-bound NPY. Only the signals of residues Asn(29) and Leu(30) were significantly more reduced in the mutant. The postulation of a different membrane binding mode of [Ala(31), Pro(32)]-NPY is further supported by the faster H/D exchange at the C-terminal amide protons. We conclude that arginine residues 33 and 35, which are believed to be directly involved in forming contacts to acidic receptor residues at the membrane-water interface, are no longer fixed in a well-defined conformation close to the membrane surface in [Ala(31), Pro(32)]-NPY.
About this Structure
1ICY is a Single protein structure of sequence from Sus scrofa with as ligand. Full crystallographic information is available from OCA.
Reference
Key motif to gain selectivity at the neuropeptide Y5-receptor: structure and dynamics of micelle-bound [Ala31, Pro32]-NPY., Bader R, Rytz G, Lerch M, Beck-Sickinger AG, Zerbe O, Biochemistry. 2002 Jun 25;41(25):8031-42. PMID:12069594
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