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2hyf

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{{STRUCTURE_2hyf| PDB=2hyf | SCENE= }}
{{STRUCTURE_2hyf| PDB=2hyf | SCENE= }}
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'''The Structure of apo-MntR from Bacillus subtilis, selenomethionine derivative'''
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===The Structure of apo-MntR from Bacillus subtilis, selenomethionine derivative===
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==Overview==
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The manganese transport regulator (MntR) from Bacillus subtilis binds cognate DNA sequences in response to elevated manganese concentrations. MntR functions as a homodimer that binds two manganese ions per subunit. Metal binding takes place at the interface of the two domains that comprise each MntR subunit: an N-terminal DNA-binding domain and a C-terminal dimerization domain. In order to elucidate the link between metal binding and activation, a crystallographic study of MntR in its metal-free state has been undertaken. Here we describe the structures of the native protein and a selenomethionine-containing variant, solved to 2.8 A. The two structures contain five crystallographically unique subunits of MntR, providing diverse views of the metal-free protein. In apo-MntR, as in the manganese complex, the dimer is formed by dyad-related C-terminal domains that provide a conserved structural core. Similarly, each DNA-binding domain largely retains the folded conformation found in metal bound forms of MntR. However, compared to metal-activated MntR, the DNA-binding domains move substantially with respect to the dimer interface in apo-MntR. Overlays of multiple apo-MntR structures indicate that there is a greater range of positioning allowed between N and C-terminal domains in the metal-free state and that the DNA-binding domains of the dimer are farther apart than in the activated complex. To further investigate the conformation of the DNA-binding domain of apo-MntR, a site-directed spin labeling experiment was performed on a mutant of MntR containing cysteine at residue 6. Consistent with the crystallographic results, EPR spectra of the spin-labeled mutant indicate that tertiary structure is conserved in the presence or absence of bound metals, though slightly greater flexibility is present in inactive forms of MntR.
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{{ABSTRACT_PUBMED_17118401}}
==About this Structure==
==About this Structure==
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[[Category: Glasfeld, A.]]
[[Category: Glasfeld, A.]]
[[Category: Transcriptional regulator]]
[[Category: Transcriptional regulator]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 14:49:39 2008''

Revision as of 11:49, 28 July 2008

Image:2hyf.png

Template:STRUCTURE 2hyf

The Structure of apo-MntR from Bacillus subtilis, selenomethionine derivative

Template:ABSTRACT PUBMED 17118401

About this Structure

2HYF is a Single protein structure of sequence from Bacillus subtilis. Full crystallographic information is available from OCA.

Reference

The conformations of the manganese transport regulator of Bacillus subtilis in its metal-free state., DeWitt MA, Kliegman JI, Helmann JD, Brennan RG, Farrens DL, Glasfeld A, J Mol Biol. 2007 Feb 2;365(5):1257-65. Epub 2006 Oct 28. PMID:17118401

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