Involved in transcriptional activation and repression of select genes by chromatin remodeling (alteration of DNA-nucleosome topology). Required for the stability of the SWI/SNF chromatin remodeling complex SWI/SNF-B (PBAF). May be involved in targeting the complex to different genes. May be involved in regulating transcriptional activation of cardiac genes. Component of the SWI/SNF-B (PBAF) chromatin remodeling complex, at least composed of SMARCA4/BRG1, SMARCB1/BAF47/SNF5, ACTL6A/BAF53A or ACTL6B/BAF53B, SMARCE1/BAF57, SMARCD1/BAF60A, SMARCD2/BAF60B, perhaps SMARCD3/BAF60C, SMARCC1/BAF155, SMARCC2/BAF170, PBRM1/BAF180, ARID2/BAF200 and actin. Interacts with SRF. Forms complexes with SRF and SRF cofactors MYOCD, NKX2-5 and SRFBP1. Highly expressed in heart. Up-regulated in adult heart (at protein level). The disease is caused by variants affecting the gene represented in this entry. Differs from position 1094 onward for unknown reason. Truncated N-terminus. Unlikely isoform. Cloning artifact.