2hzv
From Proteopedia
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[[Image:2hzv.gif|left|200px]] | [[Image:2hzv.gif|left|200px]] | ||
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'''NikR-operator DNA complex''' | '''NikR-operator DNA complex''' | ||
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[[Category: Drennan, C L.]] | [[Category: Drennan, C L.]] | ||
[[Category: Schreiter, E R.]] | [[Category: Schreiter, E R.]] | ||
| - | [[Category: | + | [[Category: Nickel]] |
| - | [[Category: | + | [[Category: Protein-dna complex]] |
| - | [[Category: | + | [[Category: Ribbon-helix-helix]] |
| - | [[Category: | + | [[Category: Transcription factor]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 06:54:43 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 03:54, 4 May 2008
NikR-operator DNA complex
Overview
Metal ion homeostasis is critical to the survival of all cells. Regulation of nickel concentrations in Escherichia coli is mediated by the NikR repressor via nickel-induced transcriptional repression of the nickel ABC-type transporter, NikABCDE. Here, we report two crystal structures of nickel-activated E. coli NikR, the isolated repressor at 2.1 A resolution and in a complex with its operator DNA sequence from the nik promoter at 3.1 A resolution. Along with the previously published structure of apo-NikR, these structures allow us to evaluate functional proposals for how metal ions activate NikR, delineate the drastic conformational changes required for operator recognition, and describe the formation of a second metal-binding site in the presence of DNA. They also provide a rare set of structural views of a ligand-responsive transcription factor in the unbound, ligand-induced, and DNA-bound states, establishing a model system for the study of ligand-mediated effects on transcription factor function.
About this Structure
2HZV is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
NikR-operator complex structure and the mechanism of repressor activation by metal ions., Schreiter ER, Wang SC, Zamble DB, Drennan CL, Proc Natl Acad Sci U S A. 2006 Sep 12;103(37):13676-81. Epub 2006 Aug 31. PMID:16945905 Page seeded by OCA on Sun May 4 06:54:43 2008
