1u3e: Difference between revisions
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'''DNA binding and cleavage by the HNH homing endonuclease I-HmuI''' | '''DNA binding and cleavage by the HNH homing endonuclease I-HmuI''' | ||
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[[Category: Shub, D A.]] | [[Category: Shub, D A.]] | ||
[[Category: Stoddard, B L.]] | [[Category: Stoddard, B L.]] | ||
[[Category: | [[Category: Helix-turn-helix dna binding domain]] | ||
[[Category: | [[Category: Hnh catalytic motif]] | ||
[[Category: | [[Category: Protein-dna complex]] | ||
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Revision as of 07:42, 3 May 2008
DNA binding and cleavage by the HNH homing endonuclease I-HmuI
Overview
The structure of I-HmuI, which represents the last family of homing endonucleases without a defining crystallographic structure, has been determined in complex with its DNA target. A series of diverse protein structural domains and motifs, contacting sequential stretches of nucleotide bases, are distributed along the DNA target. I-HmuI contains an N-terminal domain with a DNA-binding surface found in the I-PpoI homing endonuclease and an associated HNH/N active site found in the bacterial colicins, and a C-terminal DNA-binding domain previously observed in the I-TevI homing endonuclease. The combination and exchange of these features between protein families indicates that the genetic mobility associated with homing endonucleases extends to the level of independent structural domains. I-HmuI provides an unambiguous structural connection between the His-Cys box endonucleases and the bacterial colicins, supporting the hypothesis that these enzymes diverged from a common ancestral nuclease.
About this Structure
1U3E is a Single protein structure of sequence from Bacillus phage spo1. Full crystallographic information is available from OCA.
Reference
DNA binding and cleavage by the HNH homing endonuclease I-HmuI., Shen BW, Landthaler M, Shub DA, Stoddard BL, J Mol Biol. 2004 Sep 3;342(1):43-56. PMID:15313606 Page seeded by OCA on Sat May 3 10:42:44 2008
