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  • Title: Structural evidence that the P/Q domain of ZipA is an unstructured, flexible tether between the membrane and the C-terminal FtsZ-binding domain.
    Author: Ohashi T, Hale CA, de Boer PA, Erickson HP.
    Journal: J Bacteriol; 2002 Aug; 184(15):4313-5. PubMed ID: 12107152.
    Abstract:
    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.
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