mRNP network protein; pioneering mRNP component functioning early in mRNP assembly and packaging, along with Yra1p to which it is in proximity within mRNPs; has capacity to promote RNA–RNA interactions via positively charged IDR; localizes to the nucleus; required for asymmetric localization of Kar9p during mitosis; has structured domains that can engage in physical interactions when brought in close proximity in mRNP condensation process