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| - | [[Image:1ioh.gif|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1ioh| PDB=1ioh | SCENE= }} | | {{STRUCTURE_1ioh| PDB=1ioh | SCENE= }} |
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| - | '''INSULIN MUTANT A8 HIS,(B1, B10, B16, B27)GLU, DES-B30, NMR, 26 STRUCTURES'''
| + | ===INSULIN MUTANT A8 HIS,(B1, B10, B16, B27)GLU, DES-B30, NMR, 26 STRUCTURES=== |
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| - | ==Overview==
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| - | Studies of naturally occuring and chemically modified insulins have established that the NH2-terminal helix of the A-chain is important in conferring affinity in insulin-receptor interactions. Nevertheless, the three-dimensional structural basis for these observations has not previously been studied in detail. To correlate structure and function in this region of the molecule, we have used the solution structure of an engineered monomer (GluB1, GluB10, GluB16, GluB27, desB30)-insulin (4E insulin) as a template for design of A-chain mutants associated with enhanced or greatly diminished affinity for the insulin receptor. In the context of 4E insulin, the employed mutants, i.e. ThrA8-->His and ValA3-->Gly, result in species with 143% and 0.1% biological activity, respectively, relative to human insulin. The high-resolution NMR studies reveal two well-defined structures each resembling the template. However, significant structural differences are evident notably in residues A2-A8 and their immediate environment. In comparison with the template structure, the A8His mutation enhances the helical character of residues A2-A8. This structural change leads to additional exposure of a hydrophobic patch mainly consisting of species invariant residues. In contrast, the A3Gly mutation leads to stretching and disruption of the A2-A8 helix and changes both the dimensions and the access to the hydrophobic patch exposed in the more active insulins. We conclude that the mutations induce small, yet decisive structural changes that either mediate or inhibit the subtle conformational adjustments involved in the presentation of this part of the insulin pharmacophore to the receptor.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_9813131}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 9813131 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_9813131}} |
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| | ==About this Structure== | | ==About this Structure== |
| - | 1IOH is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IOH OCA]. | + | 1IOH is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IOH OCA]. |
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| | ==Reference== | | ==Reference== |
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| | [[Category: Monomer]] | | [[Category: Monomer]] |
| | [[Category: Neutral ph]] | | [[Category: Neutral ph]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:13:22 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 13:41:39 2008'' |
Revision as of 10:41, 1 July 2008
Template:STRUCTURE 1ioh
INSULIN MUTANT A8 HIS,(B1, B10, B16, B27)GLU, DES-B30, NMR, 26 STRUCTURES
Template:ABSTRACT PUBMED 9813131
About this Structure
1IOH is a Protein complex structure of sequences from Homo sapiens. Full experimental information is available from OCA.
Reference
The relationship between insulin bioactivity and structure in the NH2-terminal A-chain helix., Olsen HB, Ludvigsen S, Kaarsholm NC, J Mol Biol. 1998 Nov 27;284(2):477-88. PMID:9813131
Page seeded by OCA on Tue Jul 1 13:41:39 2008
