1m5x
From Proteopedia
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|PDB= 1m5x |SIZE=350|CAPTION= <scene name='initialview01'>1m5x</scene>, resolution 2.25Å | |PDB= 1m5x |SIZE=350|CAPTION= <scene name='initialview01'>1m5x</scene>, resolution 2.25Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=CA:CALCIUM ION'>CA</scene> | + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=DA:2'-DEOXYADENOSINE-5'-MONOPHOSPHATE'>DA</scene>, <scene name='pdbligand=DC:2'-DEOXYCYTIDINE-5'-MONOPHOSPHATE'>DC</scene>, <scene name='pdbligand=DG:2'-DEOXYGUANOSINE-5'-MONOPHOSPHATE'>DG</scene>, <scene name='pdbligand=DT:THYMIDINE-5'-MONOPHOSPHATE'>DT</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1m5x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1m5x OCA], [http://www.ebi.ac.uk/pdbsum/1m5x PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1m5x RCSB]</span> | ||
}} | }} | ||
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[[Category: Stoddard, B L.]] | [[Category: Stoddard, B L.]] | ||
[[Category: Turmel, M.]] | [[Category: Turmel, M.]] | ||
| - | [[Category: CA]] | ||
[[Category: laglidadg]] | [[Category: laglidadg]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:11:44 2008'' |
Revision as of 19:11, 30 March 2008
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| , resolution 2.25Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , , , | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of the homing endonuclease I-MsoI bound to its DNA substrate
Overview
Homing endonucleases are highly specific catalysts of DNA strand breaks that induce the transposition of mobile intervening sequences containing the endonuclease open reading frame. These enzymes recognize long DNA targets while tolerating individual sequence polymorphisms within those sites. Sequences of the homing endonucleases themselves diversify to a great extent after founding intron invasion events, generating highly divergent enzymes that recognize similar target sequences. Here, we visualize the mechanism of flexible DNA recognition and the pattern of structural divergence displayed by two homing endonuclease isoschizomers. We determined structures of I-CreI bound to two DNA target sites that differ at eight of 22 base-pairs, and the structure of an isoschizomer, I-MsoI, bound to a nearly identical DNA target site. This study illustrates several principles governing promiscuous base-pair recognition by DNA-binding proteins, and demonstrates that the isoschizomers display strikingly different protein/DNA contacts. The structures allow us to determine the information content at individual positions in the binding site as a function of the distribution of direct and water-mediated contacts to nucleotide bases, and provide an evolutionary snapshot of endonucleases at an early stage of divergence in their target specificity.
About this Structure
1M5X is a Single protein structure of sequence from Monomastix sp.. Full crystallographic information is available from OCA.
Reference
Flexible DNA target site recognition by divergent homing endonuclease isoschizomers I-CreI and I-MsoI., Chevalier B, Turmel M, Lemieux C, Monnat RJ Jr, Stoddard BL, J Mol Biol. 2003 May 30;329(2):253-69. PMID:12758074
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