title: Role of the N-terminal domain of FliI ATPase in bacterial flagellar protein export.
abstract: 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.
authors.affiliation: Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520-8114, USA.
authors.forename: Mayuko
authors.initials: M
authors.lastname: Okabe
authors.forename: Tohru
authors.initials: T
authors.lastname: Minamino
authors.forename: Katsumi
authors.initials: K
authors.lastname: Imada
authors.forename: Keiichi
authors.initials: K
authors.lastname: Namba
authors.forename: May
authors.initials: M
authors.lastname: Kihara
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D001665:Binding Sites / Q000235:genetics; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding / Q000235:genetics; D011487:Protein Conformation; D017434:Protein Structure, Tertiary / Q000235:genetics; D021381:Protein Transport / Q000235:genetics
chemical_list: D001426:Bacterial Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D000251:Adenosine Triphosphatases