1feo
From Proteopedia
(New page: 200px<br /><applet load="1feo" size="450" color="white" frame="true" align="right" spinBox="true" caption="1feo" /> '''Solution structure of omega-conotoxin MVIIA ...) |
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'''Solution structure of omega-conotoxin MVIIA with C-terminal Gly'''<br /> | '''Solution structure of omega-conotoxin MVIIA with C-terminal Gly'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Nuclear magnetic resonance spectroscopy was used to characterize the | + | Nuclear magnetic resonance spectroscopy was used to characterize the solution structure and backbone dynamics of a putative precursor form of omega-conotoxin MVIIA, a 25-amino-acid residue peptide antagonist of voltage-gated Ca(2+) channels. The mature peptide is found in the venom of a fish-hunting marine snail Conus magus and contains an amidated carboxyl terminus that is generated by oxidative cleavage of a Gly residue. The form examined in this study is identical to the mature peptide except for the presence of the unmodified carboxy-terminal Gly. This form, referred to as omega-MVIIA-Gly, has previously been shown to refold and form its disulfides more efficiently than the mature form, suggesting that the presence of the terminal Gly may favor folding in vivo. The nuclear magnetic resonance (NMR) structure determination indicated that the fold of omega-MVIIA-Gly is very similar to that previously determined for the mature form, but revealed that the terminal Gly residue participates in a network of hydrogen bonds involving both backbone and side chain atoms, very likely accounting for the enhanced stability and folding efficiency. (15)N relaxation experiments indicated that the backbone is well ordered on the nanosecond time scale but that residues 9-15 undergo a conformational exchange processes with a time constant of approximately 35 microseconds. Other studies have implicated this segment in the binding of the peptide to its physiological target, and the observed motions may play a role in allowing the peptide to enter the binding site |
==About this Structure== | ==About this Structure== | ||
| - | 1FEO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http:// | + | 1FEO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FEO OCA]. |
==Reference== | ==Reference== | ||
Solution structure and backbone dynamics of an omega-conotoxin precursor., Goldenberg DP, Koehn RE, Gilbert DE, Wagner G, Protein Sci. 2001 Mar;10(3):538-50. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11344322 11344322] | Solution structure and backbone dynamics of an omega-conotoxin precursor., Goldenberg DP, Koehn RE, Gilbert DE, Wagner G, Protein Sci. 2001 Mar;10(3):538-50. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11344322 11344322] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Gilbert, D | + | [[Category: Gilbert, D E.]] |
| - | [[Category: Goldenberg, D | + | [[Category: Goldenberg, D P.]] |
| - | [[Category: Koehn, R | + | [[Category: Koehn, R E.]] |
[[Category: Wagner, G.]] | [[Category: Wagner, G.]] | ||
[[Category: beta sheet]] | [[Category: beta sheet]] | ||
[[Category: disulfide knot]] | [[Category: disulfide knot]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:37:53 2008'' |
Revision as of 10:37, 21 February 2008
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Solution structure of omega-conotoxin MVIIA with C-terminal Gly
Overview
Nuclear magnetic resonance spectroscopy was used to characterize the solution structure and backbone dynamics of a putative precursor form of omega-conotoxin MVIIA, a 25-amino-acid residue peptide antagonist of voltage-gated Ca(2+) channels. The mature peptide is found in the venom of a fish-hunting marine snail Conus magus and contains an amidated carboxyl terminus that is generated by oxidative cleavage of a Gly residue. The form examined in this study is identical to the mature peptide except for the presence of the unmodified carboxy-terminal Gly. This form, referred to as omega-MVIIA-Gly, has previously been shown to refold and form its disulfides more efficiently than the mature form, suggesting that the presence of the terminal Gly may favor folding in vivo. The nuclear magnetic resonance (NMR) structure determination indicated that the fold of omega-MVIIA-Gly is very similar to that previously determined for the mature form, but revealed that the terminal Gly residue participates in a network of hydrogen bonds involving both backbone and side chain atoms, very likely accounting for the enhanced stability and folding efficiency. (15)N relaxation experiments indicated that the backbone is well ordered on the nanosecond time scale but that residues 9-15 undergo a conformational exchange processes with a time constant of approximately 35 microseconds. Other studies have implicated this segment in the binding of the peptide to its physiological target, and the observed motions may play a role in allowing the peptide to enter the binding site
About this Structure
1FEO is a Single protein structure of sequence from [1]. Full crystallographic information is available from OCA.
Reference
Solution structure and backbone dynamics of an omega-conotoxin precursor., Goldenberg DP, Koehn RE, Gilbert DE, Wagner G, Protein Sci. 2001 Mar;10(3):538-50. PMID:11344322
Page seeded by OCA on Thu Feb 21 12:37:53 2008
