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| - | [[Image:2zcn.jpg|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_2zcn| PDB=2zcn | SCENE= }} | | {{STRUCTURE_2zcn| PDB=2zcn | SCENE= }} |
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| - | '''Crystal structure of IcaR, a repressor of the TetR family'''
| + | ===Crystal structure of IcaR, a repressor of the TetR family=== |
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| - | ==Overview==
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| - | Expression of the gene cluster icaADBC is necessary for biofilm production in Staphylococcus epidermidis. The ica operon is negatively controlled by the repressor IcaR. Here, the crystal structure of IcaR was determined and the refined structure revealed a homodimer comprising entirely alpha-helices, typical of the tetracycline repressor protein family for gene regulations. The N-terminal domain contains a conserved helix-turn-helix DNA-binding motif with some conformational variations, indicating flexibility in this region. The C-terminal domain shows a complementary surface charge distribution about the dyad axis, ideal for efficient and specific dimer formation. The results of the electrophoretic mobility shift assay and isothermal titration calorimetry suggested that a 28 bp core segment of the ica operator is implicated in the cooperative binding of two IcaR dimers on opposite sides of the duplex DNA. Computer modeling based on the known DNA-complex structure of QacR and site-specific mutagenesis experiments showed that direct protein-DNA interactions are mostly conserved, but with slight variations for recognizing the different sequences. By interfering with the binding of IcaR to DNA, aminoglycoside gentamicin and other antibiotics may activate the icaADBC genes and elicit biofilm production in S. epidermidis, and likely S. aureus, as a defense mechanism.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_18208836}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 18208836 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_18208836}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Transcription]] | | [[Category: Transcription]] |
| | [[Category: Transcription regulation]] | | [[Category: Transcription regulation]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Apr 9 14:44:58 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 16:28:52 2008'' |
Revision as of 13:28, 27 July 2008
Template:STRUCTURE 2zcn
Crystal structure of IcaR, a repressor of the TetR family
Template:ABSTRACT PUBMED 18208836
About this Structure
2ZCN is a Single protein structure of sequence from Staphylococcus epidermidis. Full crystallographic information is available from OCA.
Reference
Crystal structure of IcaR, a repressor of the TetR family implicated in biofilm formation in Staphylococcus epidermidis., Jeng WY, Ko TP, Liu CI, Guo RT, Liu CL, Shr HL, Wang AH, Nucleic Acids Res. 2008 Jan 21;. PMID:18208836
Page seeded by OCA on Sun Jul 27 16:28:52 2008
