May control the transcriptional activity of MYC. Stimulates the activation of E box-dependent transcription by MYC (By similarity). Binds via its C-terminal region to the N-terminal region of MYC. Associates with AKAP1/S-AKAP84. Interacts with MYCBPAP. Interacts with CFAP91. Translocates into the nucleus in the S phase of the cell cycle. Belongs to the AMY1 family.