Enables (S)-citramalyl-CoA lyase activity. Involved in positive regulation of cobalamin metabolic process. Located in mitochondrion. Is expressed in several structures, including alimentary system; genitourinary system; integumental system; nervous system; and sensory organ. Orthologous to human CLYBL (citramalyl-CoA lyase). [provided by Alliance of Genome Resources, Apr 2022]