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1dfa

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{{STRUCTURE_1dfa| PDB=1dfa | SCENE= }}
{{STRUCTURE_1dfa| PDB=1dfa | SCENE= }}
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'''CRYSTAL STRUCTURE OF PI-SCEI IN C2 SPACE GROUP'''
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===CRYSTAL STRUCTURE OF PI-SCEI IN C2 SPACE GROUP===
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==Overview==
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The PI-SceI protein is an intein-encoded homing endonuclease that initiates the mobility of its gene by making a double strand break at a single site in the yeast genome. The PI-SceI protein splicing and endonucleolytic active sites are separately located in each of two domains in the PI-SceI structure. To determine the spatial relationship between bases in the PI-SceI recognition sequence and selected PI-SceI amino acids, the PI-SceI-DNA complex was probed by photocross-linking and affinity cleavage methods. Unique solvent-accessible cysteine residues were introduced into the two PI-SceI domains at positions 91, 97, 170, 230, 376, and 378, and the mutant proteins were modified with either 4-azidophenacyl bromide or iron (S)-1-(p-bromoacetamidobenzyl)-ethylenediaminetetraacetate (FeBABE). The phenyl azide-coupled proteins cross-linked to the PI-SceI target sequence, and the FeBABE-modified proteins cleaved the DNA proximal to the derivatized amino acid. The results suggest that an extended beta-hairpin loop in the endonuclease domain that contains residues 376 and 378 contacts the major groove near the PI-SceI cleavage site. Conversely, residues 91, 97, and 170 in the protein splicing domain are in close proximity to a distant region of the substrate. To interpret our results, we used a new PI-SceI structure that is ordered in regions of the protein that bind DNA. The data strongly support a model of the PI-SceI-DNA complex derived from this structure.
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(as it appears on PubMed at http://www.pubmed.gov), where 10644733 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10644733}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Intein]]
[[Category: Intein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 22:58:18 2008''

Revision as of 19:58, 30 June 2008

Image:1dfa.png

Template:STRUCTURE 1dfa

CRYSTAL STRUCTURE OF PI-SCEI IN C2 SPACE GROUP

Template:ABSTRACT PUBMED 10644733

About this Structure

1DFA is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Probing the structure of the PI-SceI-DNA complex by affinity cleavage and affinity photocross-linking., Hu D, Crist M, Duan X, Quiocho FA, Gimble FS, J Biol Chem. 2000 Jan 28;275(4):2705-12. PMID:10644733

Page seeded by OCA on Mon Jun 30 22:58:18 2008

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