Glycine radical enzyme that catalyzes the cleavage of a C-N bond in choline, producing trimethylamine (TMA) and acetaldehyde (PubMed:23151509, PubMed:24854437). Is involved in the anaerobic choline utilization pathway that allows D.alaskensis to grow on choline as a source of carbon and energy (PubMed:23151509). Is strictly specific for choline as substrate (PubMed:24854437). choline = acetaldehyde + trimethylamine kcat is 747 sec(-1). Kinetic parameters measured with a CutC -52 AA truncated variant. Amine and polyamine metabolism; choline degradation. Homodimer. Requires the activating protein CutD to generate the key active site glycyl radical on Gly-821 that is involved in catalysis. Cells lacking this gene are unable to grow on choline, in contrast to wild-type, and do not produce TMA. Belongs to the glycyl radical enzyme (GRE) family. CutC subfamily.