5ESP image
Entry Detail
PDB ID:
5ESP
Keywords:
Title:
Crystal Structure of LAGLIDADG Meganuclease I-PanMI with coordinated Calcium ions
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2015-11-16
Release Date:
2016-03-30
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:I-PanMI
Chain IDs:A, B
Chain Length:298
Number of Molecules:2
Biological Source:Podospora anserina
Polymer Type:polydeoxyribonucleotide
Description:DNA (27-MER)
Chain IDs:C (auth: G), E (auth: C)
Chain Length:27
Number of Molecules:2
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Description:DNA (27-MER)
Chain IDs:D (auth: H), F (auth: D)
Chain Length:27
Number of Molecules:2
Biological Source:synthetic construct
Primary Citation
Indirect DNA Sequence Recognition and Its Impact on Nuclease Cleavage Activity.
Structure 24 862 873 (2016)
PMID: 27133026 DOI: 10.1016/j.str.2016.03.024

Abstact

LAGLIDADG meganucleases are DNA cleaving enzymes used for genome engineering. While their cleavage specificity can be altered using several protein engineering and selection strategies, their overall targetability is limited by highly specific indirect recognition of the central four base pairs within their recognition sites. In order to examine the physical basis of indirect sequence recognition and to expand the number of such nucleases available for genome engineering, we have determined the target sites, DNA-bound structures, and central four cleavage fidelities of nine related enzymes. Subsequent crystallographic analyses of a meganuclease bound to two noncleavable target sites, each containing a single inactivating base pair substitution at its center, indicates that a localized slip of the mutated base pair causes a small change in the DNA backbone conformation that results in a loss of metal occupancy at one binding site, eliminating cleavage activity.

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Primary Citation of related structures