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1jar

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[[Image:1jar.gif|left|200px]]
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{{Seed}}
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[[Image:1jar.png|left|200px]]
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{{STRUCTURE_1jar| PDB=1jar | SCENE= }}
{{STRUCTURE_1jar| PDB=1jar | SCENE= }}
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'''Solution structure of lactam analogue (DDab)of HIV gp41 600-612 loop.'''
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===Solution structure of lactam analogue (DDab)of HIV gp41 600-612 loop.===
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==Overview==
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The conformational and immunological properties of different analogues corresponding to the 600-612 disulfide loop of the human immunodeficiency virus (HIV) gp41 glycoprotein envelope were studied. Fourteen analogues were designed and synthesised; namely, a series of seven analogues in which the disulfide bond was replaced by a lactam bridge and a series of seven analogues in which one residue of each analogue at a time, was replaced by its corresponding homologised alpha-amino acid (beta(3)-amino acid). In the case of the lactam analogues, the influence of the two possible CO-NH and NH-CO orientations of the lactam bridge as well as the size of the lactam ring was explored. The analogues were tested in ELISA with monoclonal antibodies raised against the 600-612 cyclic parent peptide as well as with sera from HIV-1 infected patients. A structural analysis of the parent and analogue peptides was carried out in dimethyl sulfoxide (DMSO-d(6)) using two-dimensional NMR techniques and molecular dynamics simulations. Comparison of the own conformation of the cyclic analogues with their either strong or weak reactivity with the antibodies reveals structural features that may be correlated with the antibody reactivity. Thus, a close structural similarity, particularly a characteristic orientation of the side-chains of residues Lys606, Leu607 and Ile608 in the loop, was found in certain beta(3)-analogues that were better recognised than the parent peptide by anti-peptide mouse monoclonal antibodies and patients' antibodies.
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The line below this paragraph, {{ABSTRACT_PUBMED_12381305}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 12381305 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12381305}}
==About this Structure==
==About this Structure==
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1JAR is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JAR OCA].
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1JAR is a [[Single protein]] structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JAR OCA].
==Reference==
==Reference==
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[[Category: Lactam bond]]
[[Category: Lactam bond]]
[[Category: Peptidomimetics.]]
[[Category: Peptidomimetics.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:59:23 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 18:24:00 2008''

Revision as of 16:12, 1 July 2008

Image:1jar.png

Template:STRUCTURE 1jar

Solution structure of lactam analogue (DDab)of HIV gp41 600-612 loop.

Template:ABSTRACT PUBMED 12381305

About this Structure

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

Reference

Structural and immunological characterisation of heteroclitic peptide analogues corresponding to the 600-612 region of the HIV envelope gp41 glycoprotein., Du AP, Limal D, Semetey V, Dali H, Jolivet M, Desgranges C, Cung MT, Briand JP, Petit MC, Muller S, J Mol Biol. 2002 Oct 25;323(3):503-21. PMID:12381305

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