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[[Image:1dc1.gif|left|200px]]
{{Seed}}
[[Image:1dc1.png|left|200px]]


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{{STRUCTURE_1dc1|  PDB=1dc1  |  SCENE=  }}  
{{STRUCTURE_1dc1|  PDB=1dc1  |  SCENE=  }}  


'''RESTRICTION ENZYME BSOBI/DNA COMPLEX STRUCTURE: ENCIRCLEMENT OF THE DNA AND HISTIDINE-CATALYZED HYDROLYSIS WITHIN A CANONICAL RESTRICTION ENZYME FOLD'''
===RESTRICTION ENZYME BSOBI/DNA COMPLEX STRUCTURE: ENCIRCLEMENT OF THE DNA AND HISTIDINE-CATALYZED HYDROLYSIS WITHIN A CANONICAL RESTRICTION ENZYME FOLD===




==Overview==
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BACKGROUND: Restriction endonucleases form a diverse family of proteins with substantial variation in sequence, structure, and interaction with recognition site DNA. BsoBI is a thermophilic restriction endonuclease that exhibits both base-specific and degenerate recognition within the sequence CPyCGPuG. RESULTS: The structure of BsoBI complexed to cognate DNA has been determined to 1.7 A resolution, revealing several unprecedented features. Each BsoBI monomer is formed by inserting a helical domain into an expanded EcoRI-type catalytic domain. DNA is completely encircled by a BsoBI dimer. Recognition sequence DNA lies within a 20 A long tunnel of protein that excludes bulk solvent. Interactions with the specific bases are made in both grooves through direct and water-mediated hydrogen bonding. Interaction with the degenerate position is mediated by a purine-specific hydrogen bond to N7, ensuring specificity, and water-mediated H bonding to the purine N6/O6 and pyrimidine N4/O4, allowing degeneracy. In addition to the conserved active site residues of the DX(n)(E/D)ZK restriction enzyme motif, His253 is positioned to act as a general base. CONCLUSIONS: A catalytic mechanism employing His253 and two metal ions is proposed. If confirmed, this would be the first example of histidine-mediated catalysis in a restriction endonuclease. The structure also provides two novel examples of the role of water in protein-DNA interaction. Degenerate recognition may be mediated by employing water as a hydrogen bond donor or acceptor. The structure of DNA in the tunnel may also be influenced by the absence of bulk solvent.
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{{ABSTRACT_PUBMED_11250198}}


==About this Structure==
==About this Structure==
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[[Category: Restriction endonuclease]]
[[Category: Restriction endonuclease]]
[[Category: Thermophilic enzyme]]
[[Category: Thermophilic enzyme]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 13:40:35 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 22:48:14 2008''

Revision as of 19:48, 30 June 2008

File:1dc1.png

Template:STRUCTURE 1dc1

RESTRICTION ENZYME BSOBI/DNA COMPLEX STRUCTURE: ENCIRCLEMENT OF THE DNA AND HISTIDINE-CATALYZED HYDROLYSIS WITHIN A CANONICAL RESTRICTION ENZYME FOLD

Template:ABSTRACT PUBMED 11250198

About this Structure

1DC1 is a Single protein structure of sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA.

Reference

Restriction enzyme BsoBI-DNA complex: a tunnel for recognition of degenerate DNA sequences and potential histidine catalysis., van der Woerd MJ, Pelletier JJ, Xu S, Friedman AM, Structure. 2001 Feb 7;9(2):133-44. PMID:11250198

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