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The cell division protein ZipA has an N-terminal transmembrane domain and a C-terminal globular domain that binds FtsZ. Between them are a charged domain and a P/Q domain rich in proline and glutamine that has been proposed to be an unfolded polypeptide. Here we provide evidence obtained by electron microscopy that the P/Q domain is a flexible tether ranging in length from 8 to 20 nm and invisible in rotary shadowing electron microscopy. We estimated a persistence length of 0.66 nm, which is similar to the persistence lengths of other unfolded and unstructured polypeptides.

Structural Evidence that the P/Q Domain of ZipA Is an Unstructured, Flexible Tether between the Membrane and the C-Terminal FtsZ-Binding Domain