1ut3

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{{STRUCTURE_1ut3| PDB=1ut3 | SCENE= }}
{{STRUCTURE_1ut3| PDB=1ut3 | SCENE= }}
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'''SOLUTION STRUCTURE OF SPHENISCIN-2, A BETA-DEFENSIN FROM PENGUIN STOMACH PRESERVING FOOD'''
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===SOLUTION STRUCTURE OF SPHENISCIN-2, A BETA-DEFENSIN FROM PENGUIN STOMACH PRESERVING FOOD===
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==Overview==
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Recently two beta-defensins, named spheniscins, have been isolated from the stomach content of the king penguin (Aptenodytes patagonicus), which is capable of preserving food for several weeks during egg incubation (Thouzeau, C., Le Maho, Y., Froget, G., Sabatier, L., Le Bohec, C., Hoffmann, J. A., and Bulet, P. (2003) J. Biol. Chem. 278, 51053-51058). It has been proposed that, in combination with other antimicrobial peptides, spheniscins may be involved in this long term preservation of food in the bird's stomach. To draw some structure/function features, the three-dimensional structure in aqueous solution of the most abundant spheniscin (Sphe-2) was determined by two-dimensional NMR and molecular modeling techniques. The overall fold of Sphe-2 includes a three-stranded antiparallel beta-sheet stabilized by three disulfide bridges with a pairing typical of beta-defensins. In addition, the N-terminal segment shows helical features on most structures. Sphe-2 is highly cationic, and its surface displays a hydrophobic patch. Comparative modeling revealed that this patch is preserved in avian defensins. The activity of Sphe-2 against a pathogenic Gram-positive strain was retained in vitro in the conditions of osmolarity found in penguin stomach content and also in different salt concentrations and compositions up to those reported for seawater. Comparison with structurally related mammalian beta-defensins showed that the hydrophobic patch is not preserved in mammalian beta-defensins and that the high cationicity of Sphe-2 is presumably the critical factor for its retained activity in high salt concentrations. Such peculiarities, in addition to a broad activity spectrum, suggest that penguin defensins may represent interesting probes for the design of highly efficient antibiotics to fight off pathogens that develop in relatively salt-rich body fluids.
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{{ABSTRACT_PUBMED_15123713}}
==About this Structure==
==About this Structure==
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1UT3 is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UT3 OCA].
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1UT3 is a [[Single protein]] structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UT3 OCA].
==Reference==
==Reference==
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[[Category: Nmr structure]]
[[Category: Nmr structure]]
[[Category: Penguin]]
[[Category: Penguin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 11:39:06 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 06:11:08 2008''

Revision as of 03:11, 28 July 2008

Image:1ut3.png

Template:STRUCTURE 1ut3

SOLUTION STRUCTURE OF SPHENISCIN-2, A BETA-DEFENSIN FROM PENGUIN STOMACH PRESERVING FOOD

Template:ABSTRACT PUBMED 15123713

About this Structure

1UT3 is a Single protein structure. Full experimental information is available from OCA.

Reference

Solution structure of spheniscin, a beta-defensin from the penguin stomach., Landon C, Thouzeau C, Labbe H, Bulet P, Vovelle F, J Biol Chem. 2004 Jul 16;279(29):30433-9. Epub 2004 Apr 30. PMID:15123713

Page seeded by OCA on Mon Jul 28 06:11:08 2008

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