A 6.7kb fragment containing the brm coding sequence (with a K804R amino acid replacement in the ATP-binding site and which is tagged at the C-terminal end with Tag:HA), flanked by 66bp of 5' genomic DNA and approximately 1.3kb of 3' genomic DNA is expressed under the control of UASt regulatory sequences. The K804R change results in the expressed protein acting as a dominant-negative.