Functions in replication-dependent translation of histone mRNAs which differ from other eukaryotic mRNAs in that they do not end with a poly-A tail but a stem-loop. May participate in circularizing those mRNAs specifically enhancing their translation (By similarity). Interacts with eif4g1, eif4g2 and slbp; probably tethered by SLBP to the 3'-end of mRNAs ending with the histone stem-loop, it also interacts with eif4g1 which is bound to their 5'-end. Belongs to the MIF4GD family.