1h9r: Difference between revisions

The molybdate-dependent transcriptional regulator ModE of Escherichia coli, functions as a sensor of intracellular molybdate concentration and a, regulator for the transcription of several operons that control the uptake, and utilization of molybdenum. We present two high-resolution crystal, structures of the C-terminal oxyanion-binding domain in complex with, molybdate and tungstate. The ligands bind between subunits at the, dimerization interface, and analysis reveals that oxyanion selectivity is, determined primarily by size. The relevance of the structures is indicated, by fluorescence measurements, which show that the oxyanion binding, properties of the C-terminal domain of ModE are similar to those of the, full-length protein. Comparisons with the apoprotein structure have, identified structural rearrangements that occur on binding oxyanion. This, molybdate-dependent conformational switch promotes a change in shape and, alterations to the surface of the protein and may provide the signal for, recruitment of other proteins to construct the machinery for, transcription. Sequence and structure-based comparisons lead to a, classification of molybdate-binding proteins.

1H9R is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with WO4 and NI as [http://en.wikipedia.org/wiki/ligands ligands]. Structure known Active Sites: AC1, AC2 and AC3. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1H9R OCA].  

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