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1q3j

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{{STRUCTURE_1q3j| PDB=1q3j | SCENE= }}
{{STRUCTURE_1q3j| PDB=1q3j | SCENE= }}
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'''Solution structure of ALO3: a new knottin-type antifungal peptide from the insect Acrocinus longimanus'''
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===Solution structure of ALO3: a new knottin-type antifungal peptide from the insect Acrocinus longimanus===
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==Overview==
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Insect peptides are key elements of the innate immunity against bacteria and fungi. These molecules offer remarkable properties: high efficacy, a low probability of resistance, limited toxicity, and immunogenicity. In this context, we are investigating several classes of peptides, and we have been successful in identifying biologically important classes of peptides and small molecules that will provide a stream of drug candidates for treating severe, life-threatening, hospital-acquired infections and other pathologies of high medical need. Recently, we have isolated a new class of antifungal peptides from the coleopteran Acrocinus longimanus. Three homologous peptides, Alo-1, Alo-2, and Alo-3, with sequence identity above 80% and active against the Candida glabrata yeast strain were identified. Alo-3 displayed the highest activity against Candida glabrata and was thus chosen for structure determination using NMR spectroscopy and molecular modeling. Alo-3 contains six cysteine residues forming three disulfide bridges. The pairing of the cysteines was assessed using ambiguous disulfide restraints within the ARIA software, allowing us to establish that Alo-3 belongs to the inhibitor cystine-knot family. It exhibits all the structural features characteristic of the knottin fold, namely, a triple-stranded antiparallel beta-sheet with a long flexible loop connecting the first strand to the second strand and a series of turns. To our knowledge, Alo-3 is the first peptide from insects with antimicrobial activity adopting the knottin fold. Alo-3 shows a level of activity significantly higher against C. glabrata than Alo-1 or Alo-2. It has no negatively charged residues and displays on its surface a cationic pole that may account for its antifungal activity. This finding is validated by the comparison of the structure of Alo-3 with the structure of other structurally related peptides from other sources also showing antifungal activity.
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(as it appears on PubMed at http://www.pubmed.gov), where 14661954 is the PubMed ID number.
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{{ABSTRACT_PUBMED_14661954}}
==About this Structure==
==About this Structure==
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1Q3J is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q3J OCA].
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1Q3J is a [[Single protein]] structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q3J OCA].
==Reference==
==Reference==
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[[Category: Knottin]]
[[Category: Knottin]]
[[Category: Peptide]]
[[Category: Peptide]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:49:22 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:11:52 2008''

Revision as of 16:12, 27 July 2008

Image:1q3j.png

Template:STRUCTURE 1q3j

Solution structure of ALO3: a new knottin-type antifungal peptide from the insect Acrocinus longimanus

Template:ABSTRACT PUBMED 14661954

About this Structure

1Q3J is a Single protein structure. Full experimental information is available from OCA.

Reference

Solution structure of Alo-3: a new knottin-type antifungal peptide from the insect Acrocinus longimanus., Barbault F, Landon C, Guenneugues M, Meyer JP, Schott V, Dimarcq JL, Vovelle F, Biochemistry. 2003 Dec 16;42(49):14434-42. PMID:14661954

Page seeded by OCA on Sun Jul 27 19:11:52 2008

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