1n7l
From Proteopedia
(New page: 200px<br /><applet load="1n7l" size="450" color="white" frame="true" align="right" spinBox="true" caption="1n7l" /> '''Solution NMR structure of phospholamban in d...) |
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| - | [[Image:1n7l.jpg|left|200px]]<br /><applet load="1n7l" size=" | + | [[Image:1n7l.jpg|left|200px]]<br /><applet load="1n7l" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1n7l" /> | caption="1n7l" /> | ||
'''Solution NMR structure of phospholamban in detergent micelles'''<br /> | '''Solution NMR structure of phospholamban in detergent micelles'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Phospholamban is an integral membrane protein that regulates the | + | Phospholamban is an integral membrane protein that regulates the contractility of cardiac muscle by maintaining cardiomyocyte calcium homeostasis. Abnormalities in association of protein kinase A with PLB have recently been linked to human heart failure, where a single mutation is responsible for dilated cardiomyopathy. To date, a high-resolution structure of phospholamban in a lipid environment has been elusive. Here, we describe the first structure of recombinant, monomeric, biologically active phospholamban in lipid-mimicking dodecylphosphocholine micelles as determined by multidimensional NMR experiments. The overall structure of phospholamban is "L-shaped" with the hydrophobic domain approximately perpendicular to the cytoplasmic portion. This is in agreement with our previously published solid-state NMR data. In addition, there are two striking discrepancies between our structure and those reported previously for synthetic phospholamban in organic solvents: a), in our structure, the orientation of the cytoplasmic helix is consistent with the amphipathic nature of these residues; and b), within the hydrophobic helix, residues are positioned on two discrete faces of the helix as consistent with their functional roles ascribed by mutagenesis. This topology renders the two phosphorylation sites, Ser-16 and Thr-17, more accessible to kinases. |
==About this Structure== | ==About this Structure== | ||
| - | 1N7L is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http:// | + | 1N7L is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1N7L OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Mascioni, A.]] | [[Category: Mascioni, A.]] | ||
| - | [[Category: Thomas, D | + | [[Category: Thomas, D D.]] |
[[Category: Veglia, G.]] | [[Category: Veglia, G.]] | ||
[[Category: Zamoon, J.]] | [[Category: Zamoon, J.]] | ||
[[Category: helix-turn-helix]] | [[Category: helix-turn-helix]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:03:05 2008'' |
Revision as of 12:03, 21 February 2008
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Solution NMR structure of phospholamban in detergent micelles
Overview
Phospholamban is an integral membrane protein that regulates the contractility of cardiac muscle by maintaining cardiomyocyte calcium homeostasis. Abnormalities in association of protein kinase A with PLB have recently been linked to human heart failure, where a single mutation is responsible for dilated cardiomyopathy. To date, a high-resolution structure of phospholamban in a lipid environment has been elusive. Here, we describe the first structure of recombinant, monomeric, biologically active phospholamban in lipid-mimicking dodecylphosphocholine micelles as determined by multidimensional NMR experiments. The overall structure of phospholamban is "L-shaped" with the hydrophobic domain approximately perpendicular to the cytoplasmic portion. This is in agreement with our previously published solid-state NMR data. In addition, there are two striking discrepancies between our structure and those reported previously for synthetic phospholamban in organic solvents: a), in our structure, the orientation of the cytoplasmic helix is consistent with the amphipathic nature of these residues; and b), within the hydrophobic helix, residues are positioned on two discrete faces of the helix as consistent with their functional roles ascribed by mutagenesis. This topology renders the two phosphorylation sites, Ser-16 and Thr-17, more accessible to kinases.
About this Structure
1N7L is a Single protein structure of sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA.
Reference
NMR solution structure and topological orientation of monomeric phospholamban in dodecylphosphocholine micelles., Zamoon J, Mascioni A, Thomas DD, Veglia G, Biophys J. 2003 Oct;85(4):2589-98. PMID:14507721
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