1b94: Difference between revisions

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[[Image:1b94.gif|left|200px]]
{{Seed}}
[[Image:1b94.png|left|200px]]


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{{STRUCTURE_1b94|  PDB=1b94  |  SCENE=  }}  
{{STRUCTURE_1b94|  PDB=1b94  |  SCENE=  }}  


'''RESTRICTION ENDONUCLEASE ECORV WITH CALCIUM'''
===RESTRICTION ENDONUCLEASE ECORV WITH CALCIUM===




==Overview==
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Following random mutagenesis of the Eco RV endonuclease, a high proportion of the null mutants carry substitutions at Gln69. Such mutants display reduced rates for the DNA cleavage step in the reaction pathway, yet the crystal structures of wild-type Eco RV fail to explain why Gln69 is crucial for activity. In this study, crystal structures were determined for two mutants of Eco RV, with Leu or Glu at residue 69, bound to specific DNA. The structures of the mutants are similar to the native protein and no function can be ascribed to the side chain of the amino acid at this locus. Instead, the structures of the mutant proteins suggest that the catalytic defect is due to the positioning of the main chain carbonyl group. In the enzyme-substrate complex for Eco RV, the main chain carbonyl of Gln69 makes no interactions with catalytic functions but, in the enzyme-product complex, it coordinates a metal ion bound to the newly liberated 5'-phosphate. This re-positioning may be hindered in the mutant proteins. Molecular dynamics calculations indicate that the metal on the phosphoryl oxygen interacts with the carbonyl group upon forming the pentavalent intermediate during phosphodiester hydrolysis. A main chain carbonyl may thus play a role in catalysis by Eco RV.
The line below this paragraph, {{ABSTRACT_PUBMED_10446231}}, adds the Publication Abstract to the page
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{{ABSTRACT_PUBMED_10446231}}


==About this Structure==
==About this Structure==
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[[Category: Endonuclease]]
[[Category: Endonuclease]]
[[Category: Restriction]]
[[Category: Restriction]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 11:13:49 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 18:36:25 2008''

Revision as of 15:36, 30 June 2008

File:1b94.png

Template:STRUCTURE 1b94

RESTRICTION ENDONUCLEASE ECORV WITH CALCIUM

Template:ABSTRACT PUBMED 10446231

About this Structure

1B94 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structural analysis of a mutational hot-spot in the EcoRV restriction endonuclease: a catalytic role for a main chain carbonyl group., Thomas MP, Brady RL, Halford SE, Sessions RB, Baldwin GS, Nucleic Acids Res. 1999 Sep 1;27(17):3438-45. PMID:10446231

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