Beta solenoid

A beta solenoid is a protein fold composed of repeating beta strands subunits, arranged in antiparallel fashion to form a superhelix.
Terminology and classification.
Beta solenoids are part of the solenoid class of protein tandem repeats.
Structure.
Beta solenoids are elongated and open protein repeats characterized by the predominance of beta strands winding around an imaginary axis, where the beta strands are typically formed between consecutive repeat units.