Sequence-specific RNA-binding protein that regulates translation and mRNA stability by binding the 3'-UTR of target mRNAs. Binds the APUM-binding elements (APBEs) in the 3'-UTR mRNA sequence of CLV1, PNH, WUS and FAS2. The pumilio repeats mediate the association with RNA by packing together to form a right-handed superhelix that approximates a half donut. The number as well as the specific sequence of the repeats determine the specificity for target mRNAs (By similarity).