1b9m
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(New page: 200px<br /><applet load="1b9m" size="450" color="white" frame="true" align="right" spinBox="true" caption="1b9m, resolution 1.75Å" /> '''REGULATOR FROM ESCHE...)
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Revision as of 09:21, 20 November 2007
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REGULATOR FROM ESCHERICHIA COLI
Overview
The molybdate-dependent transcriptional regulator (ModE) from Escherichia, coli functions as a sensor of molybdate concentration and a regulator for, transcription of operons involved in the uptake and utilization of the, essential element, molybdenum. We have determined the structure of ModE, using multi-wavelength anomalous dispersion. Selenomethionyl and native, ModE models are refined to 1. 75 and 2.1 A, respectively and describe the, architecture and structural detail of a complete transcriptional, regulator. ModE is a homodimer and each subunit comprises N- and, C-terminal domains. The N-terminal domain carries a winged, helix-turn-helix motif for binding to DNA and is primarily responsible for, ModE dimerization. The C-terminal domain contains the molybdate-binding, site and residues implicated in binding the oxyanion are identified. This, domain is divided into sub-domains a and b which have similar folds, although the organization of secondary structure elements varies. The, sub-domain fold is related to the oligomer binding-fold and similar to, that of the subunits of several toxins which are involved in extensive, protein-protein interactions. This suggests a role for the C-terminal, domain in the formation of the ModE-protein-DNA complexes necessary to, regulate transcription. Modelling of ModE interacting with DNA suggests, that a large distortion of DNA is not necessary for complex formation.
About this Structure
1B9M is a Single protein structure of sequence from Escherichia coli with NI as ligand. Full crystallographic information is available from OCA.
Reference
The high-resolution crystal structure of the molybdate-dependent transcriptional regulator (ModE) from Escherichia coli: a novel combination of domain folds., Hall DR, Gourley DG, Leonard GA, Duke EM, Anderson LA, Boxer DH, Hunter WN, EMBO J. 1999 Mar 15;18(6):1435-46. PMID:10075916
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