Download MendeleyDNA Binding and Cleavage by the HNH Homing Endonuclease I-HmuI.
Shen, B.W., Landthaler, M., Shub, D.A., Stoddard, B.L.(2004) J Mol Biol 342: 43-56
- PubMed: 15313606
- DOI: https://doi.org/10.1016/j.jmb.2004.07.032
- Primary Citation of Related Structures:
1U3E - PubMed Abstract:
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.
Organizational Affiliation:
Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. N. A3-025, Seattle, WA 98109, USA.
