May function as a transcriptional regulator essential for early embryogenesis. Interacts with RPB36B through its WQQ domain. Ubiquitous but preferentially expressed in gametophytes and young embryos. Expressed in developing embryos up to the heart stage. The WQQ domain consists of a repetition of W-x(2)-Q-x(4)-Q-x(2) motifs. Belongs to the PPR family. P subfamily.