1m4e
From Proteopedia
(New page: 200px<br /> <applet load="1m4e" size="450" color="white" frame="true" align="right" spinBox="true" caption="1m4e" /> '''Solution Structure of Hepcidin-20'''<br /> ...) |
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| - | [[Image:1m4e.gif|left|200px]]<br /> | + | [[Image:1m4e.gif|left|200px]]<br /><applet load="1m4e" size="350" color="white" frame="true" align="right" spinBox="true" |
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caption="1m4e" /> | caption="1m4e" /> | ||
'''Solution Structure of Hepcidin-20'''<br /> | '''Solution Structure of Hepcidin-20'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The antibacterial and antifungal peptide hepcidin (LEAP-1) is expressed in | + | The antibacterial and antifungal peptide hepcidin (LEAP-1) is expressed in the liver. This circulating peptide has recently been found to also act as a signaling molecule in iron metabolism. As such, it plays an important role in hereditary hemochromatosis, a serious iron overload disease. In this study, we report the solution structures of the hepcidin-20 and -25 amino acid peptides determined by standard two-dimensional (1)H NMR spectroscopy. These small cysteine-rich peptides form a distorted beta-sheet with an unusual vicinal disulfide bridge found at the turn of the hairpin, which is probably of functional significance. Both peptides exhibit an overall amphipathic structure with six of the eight Cys involved in maintaining interstrand connectivity. Hepcidin-25 assumes major and minor conformations centered about the Pro residue near the N-terminal end. Further NMR diffusion studies indicate that hepcidin-20 exists as a monomer in solution, whereas hepcidin-25 readily aggregates, a property that may contribute to the different activities of the two peptides. The nuclear Overhauser enhancement spectroscopy spectra of the hepcidin-25 aggregates indicate an interface for peptide interactions that again involves the first five residues from the N-terminal end. |
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1M4E is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http:// | + | 1M4E is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1M4E OCA]. |
==Reference== | ==Reference== | ||
The solution structure of human hepcidin, a peptide hormone with antimicrobial activity that is involved in iron uptake and hereditary hemochromatosis., Hunter HN, Fulton DB, Ganz T, Vogel HJ, J Biol Chem. 2002 Oct 4;277(40):37597-603. Epub 2002 Jul 22. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12138110 12138110] | The solution structure of human hepcidin, a peptide hormone with antimicrobial activity that is involved in iron uptake and hereditary hemochromatosis., Hunter HN, Fulton DB, Ganz T, Vogel HJ, J Biol Chem. 2002 Oct 4;277(40):37597-603. Epub 2002 Jul 22. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12138110 12138110] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Fulton, D | + | [[Category: Fulton, D B.]] |
[[Category: Ganz, T.]] | [[Category: Ganz, T.]] | ||
| - | [[Category: Hunter, H | + | [[Category: Hunter, H N.]] |
| - | [[Category: Vogel, H | + | [[Category: Vogel, H J.]] |
[[Category: beta-sheet]] | [[Category: beta-sheet]] | ||
[[Category: hairpin loop]] | [[Category: hairpin loop]] | ||
[[Category: strand-loop-strand]] | [[Category: strand-loop-strand]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:51:17 2008'' |
Revision as of 11:51, 21 February 2008
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Solution Structure of Hepcidin-20
Contents |
Overview
The antibacterial and antifungal peptide hepcidin (LEAP-1) is expressed in the liver. This circulating peptide has recently been found to also act as a signaling molecule in iron metabolism. As such, it plays an important role in hereditary hemochromatosis, a serious iron overload disease. In this study, we report the solution structures of the hepcidin-20 and -25 amino acid peptides determined by standard two-dimensional (1)H NMR spectroscopy. These small cysteine-rich peptides form a distorted beta-sheet with an unusual vicinal disulfide bridge found at the turn of the hairpin, which is probably of functional significance. Both peptides exhibit an overall amphipathic structure with six of the eight Cys involved in maintaining interstrand connectivity. Hepcidin-25 assumes major and minor conformations centered about the Pro residue near the N-terminal end. Further NMR diffusion studies indicate that hepcidin-20 exists as a monomer in solution, whereas hepcidin-25 readily aggregates, a property that may contribute to the different activities of the two peptides. The nuclear Overhauser enhancement spectroscopy spectra of the hepcidin-25 aggregates indicate an interface for peptide interactions that again involves the first five residues from the N-terminal end.
Disease
Known diseases associated with this structure: Hemochromatosis, juvenile OMIM:[606464], Hemochromatosis, juvenile, digenic OMIM:[606464]
About this Structure
1M4E is a Single protein structure of sequence from [1]. Full crystallographic information is available from OCA.
Reference
The solution structure of human hepcidin, a peptide hormone with antimicrobial activity that is involved in iron uptake and hereditary hemochromatosis., Hunter HN, Fulton DB, Ganz T, Vogel HJ, J Biol Chem. 2002 Oct 4;277(40):37597-603. Epub 2002 Jul 22. PMID:12138110
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