Enables DNA binding activity and promoter-specific chromatin binding activity. Predicted to be involved in several processes, including RNA polymerase II core complex assembly; positive regulation of core promoter binding activity; and transcription initiation from RNA polymerase II promoter. Located in nucleus. Is expressed in cerebral cortex; pancreas; and testis. Orthologous to human GTF2B (general transcription factor IIB). [provided by Alliance of Genome Resources, Apr 2022]