1lav
From Proteopedia
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| - | [[Image:1lav.gif|left|200px]] | + | [[Image:1lav.gif|left|200px]] |
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| - | '''STABILIZATION OF ESCHERICHIA COLI RIBONUCLEASE HI BY CAVITY-FILLING MUTATIONS WITHIN A HYDROPHOBIC CORE''' | + | {{Structure |
| + | |PDB= 1lav |SIZE=350|CAPTION= <scene name='initialview01'>1lav</scene>, resolution 1.8Å | ||
| + | |SITE= | ||
| + | |LIGAND= | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Ribonuclease_H Ribonuclease H], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.26.4 3.1.26.4] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''STABILIZATION OF ESCHERICHIA COLI RIBONUCLEASE HI BY CAVITY-FILLING MUTATIONS WITHIN A HYDROPHOBIC CORE''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1LAV is a [ | + | 1LAV is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LAV OCA]. |
==Reference== | ==Reference== | ||
| - | Stabilization of Escherichia coli ribonuclease HI by cavity-filling mutations within a hydrophobic core., Ishikawa K, Nakamura H, Morikawa K, Kanaya S, Biochemistry. 1993 Jun 22;32(24):6171-8. PMID:[http:// | + | Stabilization of Escherichia coli ribonuclease HI by cavity-filling mutations within a hydrophobic core., Ishikawa K, Nakamura H, Morikawa K, Kanaya S, Biochemistry. 1993 Jun 22;32(24):6171-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8390295 8390295] |
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Ribonuclease H]] | [[Category: Ribonuclease H]] | ||
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[[Category: hydrolase]] | [[Category: hydrolase]] | ||
| - | ''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 12:28:45 2008'' |
Revision as of 10:28, 20 March 2008
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| , resolution 1.8Å | |||||||
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| Activity: | Ribonuclease H, with EC number 3.1.26.4 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
STABILIZATION OF ESCHERICHIA COLI RIBONUCLEASE HI BY CAVITY-FILLING MUTATIONS WITHIN A HYDROPHOBIC CORE
Overview
The crystal structure of Escherichia coli ribonuclease HI has a cavity near Val-74 within the protein core. In order to fill the cavity space, we constructed two mutant proteins, V74L and V74I, in which Val-74 was replaced with either Leu or Ile, respectively. The mutant proteins are stabilized, as revealed by a 2.1-3.7 degrees C increase in the Tm values, as compared to the wild-type protein at pH values of 3.0 and 5.5. The mutant protein V74A, in which Val-74 is replaced with Ala, was also constructed to analyze the reverse effect. The stability of V74A decreases by 7.6 degrees C at pH 3.0 and 12.7 degrees C at pH 5.5 in Tm as compared to those values for the wild-type protein. None of the three mutations significantly affect the enzymatic activity. The crystal structures of V74L and V74I, determined at 1.8-A resolution, are almost identical to that of the wild-type protein, except for the mutation site. In the two mutant proteins, calculation by the Voronoi procedure shows that the cavity volumes around the individual mutation sites are remarkably reduced as compared to that in the wild-type protein. These results indicate that the introduction of a methylene group into the cavity, without causing steric clash, contributes to an increase in the hydrophobic interaction within the protein core and thereby enhances protein stability. We also discuss the role of the Leu side chain, which can assume many different local conformations on a helix without sacrificing thermostability.
About this Structure
1LAV is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Stabilization of Escherichia coli ribonuclease HI by cavity-filling mutations within a hydrophobic core., Ishikawa K, Nakamura H, Morikawa K, Kanaya S, Biochemistry. 1993 Jun 22;32(24):6171-8. PMID:8390295
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