The C-terminal α-helix is crucial for the activity of the bacterial ABC transporter BmrA.

ABSTRACT: ABC transporters are membrane integral proteins that consist of a transmembrane domain and nucleotide-binding domain (NBD). Two monomers (half-transporters) of the Bacillus subtilis ABC transporter Bacillus multidrug-resistance ATP (BmrA) dimerize to build a functional full-transporter. As all ABC exporters, BmrA uses the free energy of ATP hydrolysis to transport substrate molecules across the cell membrane. For substrate transport, a BmrA dimer undergoes major conformational changes. ATP binding drives dimerization of the NBDs followed by the hydrolysis of the nucleotides. Conserved structural elements within the NBD and transmembrane domain are crucial for dimerization and the activity of BmrA. In the BmrA structure, an α-helix is present at the C-terminus, which can be subdivided in tw

SUBMITTER: Osten V 

PROVIDER: S-EPMC11774805 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature