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| | {{STRUCTURE_3eip| PDB=3eip | SCENE= }} | | {{STRUCTURE_3eip| PDB=3eip | SCENE= }} |
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| - | '''CRYSTAL STRUCTURE OF COLICIN E3 IMMUNITY PROTEIN: AN INHIBITOR TO A RIBOSOME-INACTIVATING RNASE'''
| + | ===CRYSTAL STRUCTURE OF COLICIN E3 IMMUNITY PROTEIN: AN INHIBITOR TO A RIBOSOME-INACTIVATING RNASE=== |
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| - | ==Overview==
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| - | BACKGROUND: Colicins are antibiotic-like proteins of Escherichia coli that kill related strains. Colicin E3 acts as an RNase that specifically cleaves 16S rRNA, thereby inactivating the ribosomes in the infected cell. The producing organism is protected against colicin E3 by a specific inhibitor, the immunity protein Im3, which forms a tight 1:1 complex with colicin E3 and renders it inactive. Crystallographic studies on colicin E3 and Im3 have been undertaken to unravel the structural basis for the ribonucleolytic activity and its inhibition. RESULTS: The crystal structure of Im3 has been determined to a resolution of 1.8 A. The structure consists of a four-standard antiparallel beta sheet flanked by three alpha helices on one side of the sheet. Thr7, Phe9, Phe16 and Phe74 form a hydrophobic cluster on the surface of the protein in the vicinity of Cys47. This cluster is part of a putative binding pocket which also includes nine polar residues. CONCLUSIONS: The putative binding pocket of Im3 is the probable site of interaction with colicin E3. The six acidic residues in the pocket may interact with some of the numerous basic residues of colicin E3. The involvement of hydrophobic moieties in the binding is consistent with the observation that the tight complex can only be dissociated by denaturation. The structure of Im3 resembles those of certain nucleic acid binding proteins, in particular domain II of topoisomerase I and RNA-binding proteins that contain the ribonucleoprotein (RNP) sequence motif. This observation suggests that Im3 has a nucleic acid binding function in addition to binding colicin E3.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_10574790}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 10574790 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_10574790}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Colicin]] | | [[Category: Colicin]] |
| | [[Category: Ribonuclease inhibitor]] | | [[Category: Ribonuclease inhibitor]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:00:42 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 23:10:09 2008'' |
Revision as of 20:10, 27 July 2008
Template:STRUCTURE 3eip
CRYSTAL STRUCTURE OF COLICIN E3 IMMUNITY PROTEIN: AN INHIBITOR TO A RIBOSOME-INACTIVATING RNASE
Template:ABSTRACT PUBMED 10574790
About this Structure
3EIP is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structure of colicin E3 immunity protein: an inhibitor of a ribosome-inactivating RNase., Li C, Zhao D, Djebli A, Shoham M, Structure. 1999 Nov 15;7(11):1365-72. PMID:10574790
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