1jmp

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[[Image:1jmp.gif|left|200px]]
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[[Image:1jmp.png|left|200px]]
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{{STRUCTURE_1jmp| PDB=1jmp | SCENE= }}
{{STRUCTURE_1jmp| PDB=1jmp | SCENE= }}
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'''Solution Structure of the Viscotoxin B'''
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===Solution Structure of the Viscotoxin B===
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==Overview==
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Viscotoxins A2 (VA2) and B (VB) are, together with viscotoxin A3 (VA3), among the most abundant viscotoxin isoforms that occur in mistletoe-derived medicines used in anti-cancer therapy. Although these isoforms have a high degree of amino-acid-sequence similarity, they are strikingly different from each other in their in vitro cytotoxic potency towards tumour cells. First, as VA3 is the only viscotoxin whose three-dimensional (3D) structure has been solved to date, we report the NMR determination of the 3D structures of VA2 and VB. Secondly, to account for the in vitro cytotoxicity discrepancy, we carried out a comparative study of the interaction of the three viscotoxins with model membranes. Although the overall 3D structure is highly conserved among the three isoforms, some discrete structural features and associated surface properties readily account for the different affinity and perturbation of model membranes. VA3 and VA2 interact in a similar way, but the weaker hydrophobic character of VA2 is thought to be mainly responsible for the apparent different affinity towards membranes. VB is much less active than the other two viscotoxins and does not insert into model membranes. This could be related to the occurrence of a single residue (Arg25) protruding outside the hydrophobic plane formed by the two amphipathic alpha-helices, through which viscotoxins are supposed to interact with plasma membranes.
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The line below this paragraph, {{ABSTRACT_PUBMED_12733989}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 12733989 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12733989}}
==About this Structure==
==About this Structure==
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1JMP is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Viscum_album Viscum album]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JMP OCA].
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1JMP is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Viscum_album Viscum album]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JMP OCA].
==Reference==
==Reference==
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[[Category: Viscotoxin]]
[[Category: Viscotoxin]]
[[Category: Viscum album]]
[[Category: Viscum album]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 21:25:18 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:28:44 2008''

Revision as of 17:28, 1 July 2008

Image:1jmp.png

Template:STRUCTURE 1jmp

Solution Structure of the Viscotoxin B

Template:ABSTRACT PUBMED 12733989

About this Structure

1JMP is a Single protein structure of sequence from Viscum album. Full experimental information is available from OCA.

Reference

Comparative membrane interaction study of viscotoxins A3, A2 and B from mistletoe (Viscum album) and connections with their structures., Coulon A, Mosbah A, Lopez A, Sautereau AM, Schaller G, Urech K, Rouge P, Darbon H, Biochem J. 2003 Aug 15;374(Pt 1):71-8. PMID:12733989

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