1l24
From Proteopedia
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| - | [[Image:1l24.jpg|left|200px]] | + | [[Image:1l24.jpg|left|200px]] |
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| - | '''ENHANCED PROTEIN THERMOSTABILITY FROM SITE-DIRECTED MUTATIONS THAT DECREASE THE ENTROPY OF UNFOLDING''' | + | {{Structure |
| + | |PDB= 1l24 |SIZE=350|CAPTION= <scene name='initialview01'>1l24</scene>, resolution 1.7Å | ||
| + | |SITE= | ||
| + | |LIGAND= | ||
| + | |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= | ||
| + | }} | ||
| + | |||
| + | '''ENHANCED PROTEIN THERMOSTABILITY FROM SITE-DIRECTED MUTATIONS THAT DECREASE THE ENTROPY OF UNFOLDING''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1L24 is a [ | + | 1L24 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bacteriophage_t4 Bacteriophage t4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L24 OCA]. |
==Reference== | ==Reference== | ||
| - | Enhanced protein thermostability from site-directed mutations that decrease the entropy of unfolding., Matthews BW, Nicholson H, Becktel WJ, Proc Natl Acad Sci U S A. 1987 Oct;84(19):6663-7. PMID:[http:// | + | Enhanced protein thermostability from site-directed mutations that decrease the entropy of unfolding., Matthews BW, Nicholson H, Becktel WJ, Proc Natl Acad Sci U S A. 1987 Oct;84(19):6663-7. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/3477797 3477797] |
[[Category: Bacteriophage t4]] | [[Category: Bacteriophage t4]] | ||
[[Category: Lysozyme]] | [[Category: Lysozyme]] | ||
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[[Category: hydrolase (o-glycosyl)]] | [[Category: hydrolase (o-glycosyl)]] | ||
| - | ''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 12:25:19 2008'' |
Revision as of 10:25, 20 March 2008
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| , resolution 1.7Å | |||||||
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| Activity: | Lysozyme, with EC number 3.2.1.17 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
ENHANCED PROTEIN THERMOSTABILITY FROM SITE-DIRECTED MUTATIONS THAT DECREASE THE ENTROPY OF UNFOLDING
Overview
It is proposed that the stability of a protein can be increased by selected amino acid substitutions that decrease the configurational entropy of unfolding. Two such substitutions, one of the form Xaa----Pro and the other of the form Gly----Xaa, were constructed in bacteriophage T4 lysozyme at sites consistent with the known three-dimensional structure. Both substitutions stabilize the protein toward reversible and irreversible thermal denaturation at physiological pH. The substitutions have no effect on enzymatic activity. High-resolution crystallographic analysis of the proline-containing mutant protein (Ala-82----Pro) shows that its three-dimensional structure is essentially identical with the wild-type enzyme. The overall structure of the other mutant enzyme (Gly-77----Ala) is also very similar to wild-type lysozyme, although there are localized conformational adjustments in the vicinity of the altered amino acid. The combination of a number of such amino acid replacements, each of which is expected to contribute approximately 1 kcal/mol (1 cal = 4.184 J) to the free energy of folding, may provide a general strategy for substantial improvement in the stability of a protein.
About this Structure
1L24 is a Single protein structure of sequence from Bacteriophage t4. Full crystallographic information is available from OCA.
Reference
Enhanced protein thermostability from site-directed mutations that decrease the entropy of unfolding., Matthews BW, Nicholson H, Becktel WJ, Proc Natl Acad Sci U S A. 1987 Oct;84(19):6663-7. PMID:3477797
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