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1jlo

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[[Image:1jlo.gif|left|200px]]
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{{STRUCTURE_1jlo| PDB=1jlo | SCENE= }}
{{STRUCTURE_1jlo| PDB=1jlo | SCENE= }}
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'''Solution Structure of the Noncompetitive Skeletal Muscle Nicotinic Acetylcholine Receptor Antagonist Psi-conotoxin PIIIE'''
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===Solution Structure of the Noncompetitive Skeletal Muscle Nicotinic Acetylcholine Receptor Antagonist Psi-conotoxin PIIIE===
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==Overview==
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A revised, high-resolution structure of psi-conotoxin Piiie (psi-Piiie), a noncompetitive inhibitor of the nicotinic acetylcholine receptor (nAChR), produced through the use of NMR and molecular modeling calculations is presented. The original structures of psi-Piiie had a relatively high degree of disorder, particularly in the conformation of the disulfide bridges. Our studies utilized (13)C-labeling of selected cysteine residues allowing the resolution of all problems of resonance overlap for the cysteine residues. The improved data were used to produce a new set of structures by a molecular modeling process incorporating relaxation matrix methods for the determination of interproton distance restraints and a combination of distance geometry and simulated annealing for structure generation. The structures produced are very well converged with the RMSD of backbone atom positions of the main body of the peptide improving from 0.73 to 0.13 A. Other indicators of correlation with the experimental data and quality of covalent geometry showed significant improvement in the new structures. The overall conformation of the peptide backbone is similar between the two determinations with the exception of the N-terminus. This difference leads to a significant effect on the predicted distribution of positive charge within psi-Piiie, a property likely to influence interpretation of future mutational studies.
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The line below this paragraph, {{ABSTRACT_PUBMED_12767215}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 12767215 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12767215}}
==About this Structure==
==About this Structure==
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1JLO is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JLO OCA].
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1JLO is a [[Single protein]] structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JLO OCA].
==Reference==
==Reference==
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[[Category: Amidated c-terminus]]
[[Category: Amidated c-terminus]]
[[Category: Multiple disulfide bond]]
[[Category: Multiple disulfide bond]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 21:22:34 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:26:18 2008''

Revision as of 17:26, 1 July 2008

Image:1jlo.png

Template:STRUCTURE 1jlo

Solution Structure of the Noncompetitive Skeletal Muscle Nicotinic Acetylcholine Receptor Antagonist Psi-conotoxin PIIIE

Template:ABSTRACT PUBMED 12767215

About this Structure

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

Reference

An improved solution structure for psi-conotoxin PiiiE., Van Wagoner RM, Ireland CM, Biochemistry. 2003 Jun 3;42(21):6347-52. PMID:12767215

Page seeded by OCA on Tue Jul 1 20:26:18 2008

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