1rwb

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{{STRUCTURE_1rwb| PDB=1rwb | SCENE= }}
{{STRUCTURE_1rwb| PDB=1rwb | SCENE= }}
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'''Cooperative Effect of Two Surface Amino Acid Mutations (Q252L and E170K) of Glucose Dehydrogenase from Bacillus megaterium IWG3 for the stabilization of Oligomeric State'''
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===Cooperative Effect of Two Surface Amino Acid Mutations (Q252L and E170K) of Glucose Dehydrogenase from Bacillus megaterium IWG3 for the stabilization of Oligomeric State===
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==Overview==
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A thermostable glucose dehydrogenase (GlcDH) mutant of Bacillus megaterium IWG3 harboring the Q252L substitution (Y. Makino, S. Negoro, I. Urabe, and H. Okada, J. Biol. Chem. 264:6381-6385, 1989) is stable at pH values above 9, but only in the presence of 2 M NaCl. Another GlcDH mutant exhibiting increased stability at an alkaline pH in the absence of NaCl has been isolated previously (S.-H. Baik, T. Ide, H. Yoshida, O. Kagami, and S. Harayama, Appl. Microbiol. Biotechnol. 61:329-335, 2003). This mutant had two amino acid substitutions, Q252L and E170K. In the present study, we characterized three GlcDH mutants harboring the substitutions Q252L, E170K, and Q252L/E170K under low-salt conditions. The GlcDH mutant harboring two substitutions, Q252L/E170K, was stable, but mutants harboring a single substitution, either Q252L or E170K, were unstable at an alkaline pH. Gel filtration chromatography analyses demonstrated that the oligomeric state of the Q252/E170K enzyme was stable, while the tetramers of the enzymes harboring a single substitution (Q252L or E170K) dissociated into dimers at an alkaline pH. These results indicated that the Q252L and E170K substitutions synergistically strengthened the interaction at the dimer-dimer interface. The crystal structure of the E170K/Q252L mutant, determined at 2.0-angstroms resolution, showed that residues 170 and 252 are located in a hydrophobic cavity at the subunit-subunit interface. We concluded that these residues in the wild-type enzyme have thermodynamically unfavorable effects, while the Q252L and E170K substitutions increase the subunit-subunit interactions by stabilizing the hydrophobic cavity.
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{{ABSTRACT_PUBMED_15933031}}
==About this Structure==
==About this Structure==
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[[Category: Michel, F.]]
[[Category: Michel, F.]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:58:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:09:32 2008''

Revision as of 16:09, 27 July 2008

Image:1rwb.png

Template:STRUCTURE 1rwb

Cooperative Effect of Two Surface Amino Acid Mutations (Q252L and E170K) of Glucose Dehydrogenase from Bacillus megaterium IWG3 for the stabilization of Oligomeric State

Template:ABSTRACT PUBMED 15933031

About this Structure

1RWB is a Single protein structure of sequence from Bacillus megaterium. Full crystallographic information is available from OCA.

Reference

Cooperative effect of two surface amino acid mutations (Q252L and E170K) in glucose dehydrogenase from Bacillus megaterium IWG3 on stabilization of its oligomeric state., Baik SH, Michel F, Aghajari N, Haser R, Harayama S, Appl Environ Microbiol. 2005 Jun;71(6):3285-93. PMID:15933031

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