1gez: Difference between revisions
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[[Image:1gez.jpg|left|200px]] | [[Image:1gez.jpg|left|200px]] | ||
'''BURIED POLAR MUTANT HUMAN LYSOZYME''' | {{Structure | ||
|PDB= 1gez |SIZE=350|CAPTION= <scene name='initialview01'>1gez</scene>, resolution 1.8Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=NA:SODIUM ION'>NA</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] | |||
|GENE= | |||
}} | |||
'''BURIED POLAR MUTANT HUMAN LYSOZYME''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1GEZ is a [ | 1GEZ is a [[Single protein]] structure of sequence 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=1GEZ OCA]. | ||
==Reference== | ==Reference== | ||
Contribution of polar groups in the interior of a protein to the conformational stability., Takano K, Yamagata Y, Yutani K, Biochemistry. 2001 Apr 17;40(15):4853-8. PMID:[http:// | Contribution of polar groups in the interior of a protein to the conformational stability., Takano K, Yamagata Y, Yutani K, Biochemistry. 2001 Apr 17;40(15):4853-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11294653 11294653] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Lysozyme]] | [[Category: Lysozyme]] | ||
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[[Category: stability]] | [[Category: stability]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:22:13 2008'' | ||
Revision as of 12:22, 20 March 2008
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| , resolution 1.8Å | |||||||
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| Ligands: | |||||||
| Activity: | Lysozyme, with EC number 3.2.1.17 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
BURIED POLAR MUTANT HUMAN LYSOZYME
OverviewOverview
It has been generally believed that polar residues are usually located on the surface of protein structures. However, there are many polar groups in the interior of the structures in reality. To evaluate the contribution of such buried polar groups to the conformational stability of a protein, nonpolar to polar mutations (L8T, A9S, A32S, I56T, I59T, I59S, A92S, V93T, A96S, V99T, and V100T) in the interior of a 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 polar group had a heavy energy cost to be buried, a mutant protein would be remarkably destabilized. However, the stability (Delta G) of the Ala to Ser and Val to Thr mutant human lysozymes was comparable to that of the wild-type protein, suggesting a low-energy penalty of buried polar groups. The structural analysis showed that all polar side chains introduced in the mutant proteins were able to find their hydrogen bond partners, which are ubiquitous in protein structures. The empirical structure-based calculation of stability change (Delta Delta G) [Takano et al. (1999) Biochemistry 38, 12698--12708] revealed that the mutant proteins decreased the hydrophobic effect contributing to the stability (Delta G(HP)), but this destabilization was recovered by the hydrogen bonds newly introduced. The present study shows the favorable contribution of polar groups with hydrogen bonds in the interior of protein molecules to the conformational stability.
DiseaseDisease
Known diseases associated with this structure: Amyloidosis, renal OMIM:[153450], Microphthalmia, syndromic 1 OMIM:[309800]
About this StructureAbout this Structure
1GEZ is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Contribution of polar groups in the interior of a protein to the conformational stability., Takano K, Yamagata Y, Yutani K, Biochemistry. 2001 Apr 17;40(15):4853-8. PMID:11294653
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