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2hza

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[[Image:2hza.gif|left|200px]]
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{{STRUCTURE_2hza| PDB=2hza | SCENE= }}
{{STRUCTURE_2hza| PDB=2hza | SCENE= }}
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'''Nickel-bound full-length Escherichia coli NikR'''
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===Nickel-bound full-length Escherichia coli NikR===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 16945905 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16945905}}
==About this Structure==
==About this Structure==
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[[Category: Ribbon-helix-helix]]
[[Category: Ribbon-helix-helix]]
[[Category: Transcription factor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:57:54 2008''

Revision as of 23:57, 28 July 2008

Image:2hza.png

Template:STRUCTURE 2hza

Nickel-bound full-length Escherichia coli NikR

Template:ABSTRACT PUBMED 16945905

About this Structure

2HZA 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 Tue Jul 29 02:57:54 2008

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