Add time:08/28/2019         Source:sciencedirect.com

FliI, the ATPase involved in bacterial flagellar protein export, forms a complex with its regulator FliH in the cytoplasm and hexamerizes upon docking to the export gate composed of integral membrane proteins. The extreme N-terminal region of FliI is involved not only in its interaction with FliH but also in its oligomerization, but the regulatory mechanism of oligomerization remains unclear. Using in-frame 10-residue deletions within the 100 residues of the N-terminal domain, we demonstrate that the first 20 residues are required for FliH binding and that the conformation of the N-terminal domain is sensitive to the export function, even though the oligomerization and FliH-binding ability are retained and the ATPase activity is maintained in most of the deletion variants.

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