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1qvk

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[[Image:1qvk.gif|left|200px]]
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{{STRUCTURE_1qvk| PDB=1qvk | SCENE= }}
{{STRUCTURE_1qvk| PDB=1qvk | SCENE= }}
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'''Structure of the antimicrobial hexapeptide cyc-(RRWWRF) bound to DPC micelles'''
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===Structure of the antimicrobial hexapeptide cyc-(RRWWRF) bound to DPC micelles===
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==Overview==
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Antimicrobial, cationic peptides are abundant throughout nature as part of many organisms' defence against microorganisms. They exhibit a large variety of sequences and structural motifs and are thought to act by rupturing the bacterial membrane. Several models based on biophysical experiments have been proposed for their mechanism of action. Here we present the NMR-determined structure of the cyclic, cationic antimicrobial peptide cyclo(RRWWRF) both free in aqueous solution and bound to detergent micelles. The peptide has a rather flexible but ordered structure in water. A distinct structure is formed when the peptide is bound to a detergent micelle. The structures in neutral and negatively charged micelles are nearly identical but differ from that in aqueous solution. The orientation of the amino acid side chains creates an amphipathic molecule with the peptide backbone forming the hydrophilic part. The orientation of the peptide in the micelle was determined by using NOEs and paramagnetic agents. The peptide is oriented mainly parallel to the micelle surface in both detergents. Substitution of the arginine and tryptophan residues is known to influence the antimicrobial activity. Therefore the structure of the micelle-bound analogues cyclo(RRYYRF), cyclo(KKWWKF) and cyclo(RRNalNalRF) were also determined. They exhibit remarkable similarities in backbone conformation and side-chain orientation. The structure of these peptides allows the side-chain properties to be correlated to biological activity.
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(as it appears on PubMed at http://www.pubmed.gov), where 16075425 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16075425}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QVK OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QVK OCA].
==Reference==
==Reference==
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[[Category: Antimicrobial peptide]]
[[Category: Antimicrobial peptide]]
[[Category: Cyclic peptide]]
[[Category: Cyclic peptide]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:45:01 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:19:17 2008''

Revision as of 04:19, 28 July 2008

Image:1qvk.png

Template:STRUCTURE 1qvk

Structure of the antimicrobial hexapeptide cyc-(RRWWRF) bound to DPC micelles

Template:ABSTRACT PUBMED 16075425

About this Structure

Full experimental information is available from OCA.

Reference

Structure of the antimicrobial, cationic hexapeptide cyclo(RRWWRF) and its analogues in solution and bound to detergent micelles., Appelt C, Wessolowski A, Soderhall JA, Dathe M, Schmieder P, Chembiochem. 2005 Sep;6(9):1654-62. PMID:16075425

Page seeded by OCA on Mon Jul 28 07:19:17 2008

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