Enables several functions, including calmodulin binding activity; protein domain specific binding activity; and protein phosphatase 1 binding activity. Involved in negative regulation of transcription, DNA-templated. Acts upstream of or within several processes, including blood vessel diameter maintenance; peptidyl-serine phosphorylation; and response to activity. Located in I band; M band; and nucleus. Is expressed in several structures, including aorta; diaphragm; genitourinary system; ileum; and skeletal muscle. Orthologous to human SMTNL1 (smoothelin like 1). [provided by Alliance of Genome Resources, Apr 2022]