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1a74

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[[Image:1a74.jpg|left|200px]]
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{{STRUCTURE_1a74| PDB=1a74 | SCENE= }}
{{STRUCTURE_1a74| PDB=1a74 | SCENE= }}
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'''I-PPOL HOMING ENDONUCLEASE/DNA COMPLEX'''
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===I-PPOL HOMING ENDONUCLEASE/DNA COMPLEX===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 9665136 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9665136}}
==About this Structure==
==About this Structure==
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[[Category: Protein folding]]
[[Category: Protein folding]]
[[Category: Zinc finger]]
[[Category: Zinc finger]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:54:54 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 16:17:07 2008''

Revision as of 13:17, 30 June 2008

Image:1a74.png

Template:STRUCTURE 1a74

I-PPOL HOMING ENDONUCLEASE/DNA COMPLEX

Template:ABSTRACT PUBMED 9665136

About this Structure

1A74 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

Page seeded by OCA on Mon Jun 30 16:17:07 2008

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