1a73
From Proteopedia
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| - | [[Image:1a73.gif|left|200px]] | + | [[Image:1a73.gif|left|200px]] |
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| - | '''INTRON-ENCODED ENDONUCLEASE I-PPOI COMPLEXED WITH DNA''' | + | {{Structure |
| + | |PDB= 1a73 |SIZE=350|CAPTION= <scene name='initialview01'>1a73</scene>, resolution 1.8Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> and <scene name='pdbligand=MG:MAGNESIUM ION'>MG</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''INTRON-ENCODED ENDONUCLEASE I-PPOI COMPLEXED WITH DNA''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1A73 is a [ | + | 1A73 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Physarum_polycephalum Physarum polycephalum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1A73 OCA]. |
==Reference== | ==Reference== | ||
| - | DNA binding and cleavage by the nuclear intron-encoded homing endonuclease I-PpoI., Flick KE, Jurica MS, Monnat RJ Jr, Stoddard BL, Nature. 1998 Jul 2;394(6688):96-101. PMID:[http:// | + | DNA binding and cleavage by the nuclear intron-encoded homing endonuclease I-PpoI., Flick KE, Jurica MS, Monnat RJ Jr, Stoddard BL, Nature. 1998 Jul 2;394(6688):96-101. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9665136 9665136] |
[[Category: Physarum polycephalum]] | [[Category: Physarum polycephalum]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: zinc]] | [[Category: zinc]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 09:53:50 2008'' |
Revision as of 07:53, 20 March 2008
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| , resolution 1.8Å | |||||||
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| Coordinates: | save as pdb, mmCIF, xml | ||||||
INTRON-ENCODED ENDONUCLEASE I-PPOI COMPLEXED WITH DNA
Overview
Homing endonucleases are a diverse collection of proteins that are encoded by genes with mobile, self-splicing introns. They have also been identified in self-splicing inteins (protein introns). These enzymes promote the movement of the DNA sequences that encode them from one chromosome location to another; they do this by making a site-specific double-strand break at a target site in an allele that lacks the corresponding mobile intron. The target sites recognized by these small endonucleases are generally long (14-44 base pairs). Four families of homing endonucleases have been identified, including the LAGLIDADG, the His-Cys box, the GIY-YIG and the H-N-H endonucleases. The first identified His-Cys box homing endonuclease was I-PpoI from the slime mould Physarum polycephalum. Its gene resides in one of only a few nuclear introns known to exhibit genetic mobility. Here we report the structure of the I-PpoI homing endonuclease bound to homing-site DNA determined to 1.8 A resolution. I-PpoI displays an elongated fold of dimensions 25 x 35 x 80 A, with mixed alpha/beta topology. Each I-PpoI monomer contains three antiparallel beta-sheets flanked by two long alpha-helices and a long carboxy-terminal tail, and is stabilized by two bound zinc ions 15 A apart. The enzyme possesses a new zinc-bound fold and endonuclease active site. The structure has been determined in both uncleaved substrate and cleaved product complexes.
About this Structure
1A73 is a Single protein structure of sequence from Physarum polycephalum. Full crystallographic information is available from OCA.
Reference
DNA binding and cleavage by the nuclear intron-encoded homing endonuclease I-PpoI., Flick KE, Jurica MS, Monnat RJ Jr, Stoddard BL, Nature. 1998 Jul 2;394(6688):96-101. PMID:9665136
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