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TSS9, PorZ, N-terminal beta-propeller domain
two-component regulator propeller domain-containing protein
A large group of two component regulator proteins appear to have the same N-terminal structure of 14 tandem repeats. These repeats show homology to Pfam:PF01011 and Pfam:PF00400 indicating that they are likely to form a beta-propeller. This family has been built with artificially high cut-offs in order to avoid overlaps with other beta-propeller families. The fourteen repeats are likely to form two propellers; it is not clear if these structures are likely to recruit other proteins or interact with DNA. (from Pfam)
T9SS type A sorting domain-containing protein
Type IX secretions systems (T9SS) occur in the Bacteroidetes, such as Cytophaga hutchinsonii and Flavobacterium johnsoniae, and are required for the type of gliding motility seen in that lineage, although they are not limited processing target proteins from that system. The C-terminal domain described by TIGR04183, recognized as sorting signal by T9SS, is now known as type A, and is quite distinct from type B (see TIGR04131). Most targets of T9SS are cleaved by a transpeptidase and then attached to a component of the outer membrane, but a few are released in soluble form.
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