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The human gene  BDP1 , localized on chromosome 5q13 in close proximity to the spinal muscular atrophy determining gene  SMN , encodes a large protein consisting of 2254 amino acids (aa). In the first third of the gene, the subunit of the RNA polymerase III (Pol III) transcription factor complex (TFIIIBα/β) is encoded. To further characterize the function of BDP1, we carried out a yeast two-hybrid screen using various parts of BDP1. With the clone BDP1-(1–640) we identified a novel interaction partner, ZNF297B. The  ZNF297B  gene is localized on chromosome 9q24 and encodes a zinc finger protein of 467 aa possessing the typical structure of a transcription factor. The interaction found in yeast was confirmed by co-immunoprecipitation and refined to the N-terminal region of ZNF297B-(1–127) containing the BTB/POZ domain and the N-terminal end of BDP1-(1–299). The ZNF297B transcript is 5.7 kb in length and ubiquitously expressed, with highest levels found in muscles. Immunofluorescence staining revealed a speckled pattern in the nuclei of HEK293 cells. Due to the essential role of BDP1 in Pol III transcription, we propose that ZNF297B may also regulate these transcriptional pathways.

The zinc finger protein ZNF297B interacts with BDP1, a subunit of TFIIIB