Predicted to enable RNA polymerase II CTD heptapeptide repeat phosphatase activity; TFIIF-class transcription factor complex binding activity; and Tat protein binding activity. Involved in negative regulation of cell growth involved in cardiac muscle cell development. Predicted to be located in microtubule cytoskeleton; midbody; and nucleoplasm. Predicted to be part of protein-containing complex. Orthologous to human CTDP1 (CTD phosphatase subunit 1). [provided by Alliance of Genome Resources, Apr 2022]