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1ge1

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{{STRUCTURE_1ge1| PDB=1ge1 | SCENE= }}
{{STRUCTURE_1ge1| PDB=1ge1 | SCENE= }}
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'''CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME SUBSTITUTED AT LEFT-HANDED HELICAL POSITIONS'''
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===CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME SUBSTITUTED AT LEFT-HANDED HELICAL POSITIONS===
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==Overview==
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To understand the role of non-Gly residues in the left-handed helical conformation for the conformational stability of a protein, the non-Gly to Gly and Ala mutations at six left-handed residues (R21, Y38, R50, Q58, H78, and N118) of the human lysozyme were examined. The thermodynamic parameters for denaturation were determined using a differential scanning calorimeter, and the crystal structures were analyzed by X-ray crystallography. If a left-handed non-Gly had an unfavorable steric interaction between the side-chain Cbeta and backbone, the Gly mutation would be expected to stabilize more than the Ala mutation at the same position. For the mutant human lysozymes, however, there were few differences in the denaturation Gibbs energy (DeltaG) between the Gly and Ala mutants, except for the substitution at position 58. Analysis of the changes in stability (DeltaDeltaG) based on the structures of the wild-type and mutant proteins showed that the experimental DeltaDeltaG value of Q58G was approximately 7 kJ/mol higher than the estimated value without consideration of any local steric interaction. These results indicate that only Q58G increased the stability by elimination of local constraints. The residue 58 is located at the most rigid position in the left-handed non-Gly residues and is involved in its enzymatic function. It can be concluded that the left-handed non-Gly residues do not always have unfavorable strain energies as compared with Gly at the same position.
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(as it appears on PubMed at http://www.pubmed.gov), where 11455596 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11455596}}
==About this Structure==
==About this Structure==
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[[Category: Non-glycine residues at left-handed helical structure]]
[[Category: Non-glycine residues at left-handed helical structure]]
[[Category: Stability]]
[[Category: Stability]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 05:08:59 2008''

Revision as of 02:09, 1 July 2008

Image:1ge1.png

Template:STRUCTURE 1ge1

CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME SUBSTITUTED AT LEFT-HANDED HELICAL POSITIONS

Template:ABSTRACT PUBMED 11455596

About this Structure

1GE1 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Role of non-glycine residues in left-handed helical conformation for the conformational stability of human lysozyme., Takano K, Yamagata Y, Yutani K, Proteins. 2001 Aug 15;44(3):233-43. PMID:11455596

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