ATP-binding cassette domain of the molybdenum transport system
ModC is an ABC-type transporter and the ATPase component of a molybdate transport system that also includes the periplasmic binding protein ModA and the membrane protein ModB. ABC transporters are a large family of proteins involved in the transport of a wide variety of different compounds, like sugars, ions, peptides and more complex organic molecules. The nucleotide binding domain shows the highest similarity between all members of the family. ABC transporters are a subset of nucleotide hydrolases that contain a signature motif, Q-loop, and H-loop/switch region, in addition to, the Walker A motif/P-loop and Walker B motif commonly found in a number of ATP- and GTP-binding and hydrolyzing proteins.
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