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| [[Image:1za8.jpg|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_1za8| PDB=1za8 | SCENE= }} | | {{STRUCTURE_1za8| PDB=1za8 | SCENE= }} |
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| '''NMR solution structure of a leaf-specific-expressed cyclotide vhl-1'''
| | ===NMR solution structure of a leaf-specific-expressed cyclotide vhl-1=== |
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| ==Overview==
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| Based on a newly established sequencing strategy featured by its efficiency, simplicity, and easy manipulation, the sequences of four novel cyclotides (macrocyclic knotted proteins) isolated from an Australian plant Viola hederaceae were determined. The three-dimensional solution structure of V. hederaceae leaf cyclotide-1 (vhl-1), a leaf-specific expressed 31-residue cyclotide, has been determined using two-dimensional (1)H NMR spectroscopy. vhl-1 adopts a compact and well defined structure including a distorted triple-stranded beta-sheet, a short 3(10) helical segment and several turns. It is stabilized by three disulfide bonds, which, together with backbone segments, form a cyclic cystine knot motif. The three-disulfide bonds are almost completely buried into the protein core, and the six cysteines contribute only 3.8% to the molecular surface. A pH titration experiment revealed that the folding of vhl-1 shows little pH dependence and allowed the pK(a) of 3.0 for Glu(3) and approximately 5.0 for Glu(14) to be determined. Met(7) was found to be oxidized in the native form, consistent with the fact that its side chain protrudes into the solvent, occupying 7.5% of the molecular surface. vhl-1 shows anti-HIV activity with an EC(50) value of 0.87 microm.
| | The line below this paragraph, {{ABSTRACT_PUBMED_15824119}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 15824119 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_15824119}} |
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| ==About this Structure== | | ==About this Structure== |
| Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZA8 OCA]. | | Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZA8 OCA]. |
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| ==Reference== | | ==Reference== |
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| [[Category: Circular protein]] | | [[Category: Circular protein]] |
| [[Category: Cyclic cystine knot motif]] | | [[Category: Cyclic cystine knot motif]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:22:45 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:28:41 2008'' |
