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Instruments / Technical Area	Publication Details	Published	Actions
I02-Macromolecular Crystallography	Structure of the Phosphatase Domain of the Cell Fate Determinant SpoIIE from Bacillus subtilis Vladimir Levdikov , Elena Blagova , Andrea Rawlings , Katie Jameson , James Tunaley , Darren J. Hart , Imrich Barak , Anthony Wilkinson Journal Of Molecular Biology 415 (2) DOI: 10.1016/j.jmb.2011.11.017 Open Access Show Abstract ▼ Abstract: Sporulation in Bacillus subtilis begins with an asymmetric cell division producing two genetically identical cells with different fates. SpoIIE is a membrane protein that localizes to the polar cell division sites where it causes FtsZ to relocate from mid-cell to form polar Z-rings. Following polar septation, SpoIIE establishes compartment-specific gene expression in the smaller forespore cell by dephosphorylating the anti-sigma factor antagonist SpoIIAA, leading to the release of the RNA polymerase sigma factor ?F from an inhibitory complex with the anti-sigma factor SpoIIAB. SpoIIE therefore couples morphological development to differential gene expression. Here, we determined the crystal structure of the phosphatase domain of SpoIIE to 2.6 Å spacing, revealing a domain-swapped dimer. SEC-MALLS (size-exclusion chromatography with multi-angle laser light scattering) analysis however suggested a monomer as the principal form in solution. A model for the monomer was derived from the domain-swapped dimer in which 2 five-stranded ?-sheets are packed against one another and flanked by ?-helices in an ???? arrangement reminiscent of other PP2C-type phosphatases. A flap region that controls access of substrates to the active site in other PP2C phosphatases is diminished in SpoIIE, and this observation correlates with the presence of a single manganese ion in the active site of SpoIIE in contrast to the two or three metal ions present in other PP2C enzymes. Mapping of a catalogue of mutational data onto the structure shows a clustering of sites whose point mutation interferes with the proper coupling of asymmetric septum formation to sigma factor activation and identifies a surface involved in intramolecular signaling.	Nov 2011

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I02-Macromolecular Crystallography

Structure of the Phosphatase Domain of the Cell Fate Determinant SpoIIE from Bacillus subtilis

Vladimir Levdikov , Elena Blagova , Andrea Rawlings , Katie Jameson , James Tunaley , Darren J. Hart , Imrich Barak , Anthony Wilkinson

Journal Of Molecular Biology 415 (2)

DOI: 10.1016/j.jmb.2011.11.017