Enables chromatin binding activity. Acts upstream of or within negative regulation of transcription by RNA polymerase II. Part of SWI/SNF complex; nBAF complex; and npBAF complex. Is expressed in cranial ganglion; genitourinary system; and inner ear. Orthologous to human SMARCC2 (SWI/SNF related, matrix associated, actin dependent regulator of chromatin subfamily c member 2). [provided by Alliance of Genome Resources, Apr 2022]