May play a role in the process of sperm capacitation. Found in a complex at least composed of MROH2B, PRKACA isoform 2 and TCP11. Interacts with PRKACA. Interacts with TCP11. Colocalizes with PRKACA and TCP11 on the acrosome and tail regions in round spermatids and spermatozoa regardless of the capacitation status of the sperm. Constitutively phosphorylated on serine and threonine residues in acrosomal region of the sperm head, midpiece and flagellar regions of noncapacitated spermatozoa. Phosphorylation on tyrosine residues increases upon sperm capacitation within the acrosomal and tail regions in a protein kinase A (PKA)-dependent signaling pathway. Truncated N-terminus.