Probable transcriptional factor. Interacts strongly with LDBS. Interacts with DEAF1; LMO4 blocks export from nucleus. Interacts with CLIM1 and CLIM2. Interacts (via the LIM zinc-binding domain 1) with RBBP8. Interacts with BRCA1 (via the BRCT domains); the interaction represses BRCA1 transcriptional activity (By similarity).