Background：Plays a role in spermatogenesis by enhancing the binding of CREM isoform tau to its coactivator FHL5 and increasing the FHL5-regulated transcriptional activation of CREM isoform tau(By similarity). Involved in the acrosome reaction and in binding of sperm to the zona pellucida(By similarity). Plays a role in regulation of the cell cycle by controlling progression through the G2/M phase, possibly by delaying the activation of CDK1 which is required for entry into mitosis(PubMed:19548270). May play a role in fertility and microtubule formation through interaction with RANBP9(PubMed:10500252).
