Protein involved in translation repression and P-body disassembly; binds to mRNAs under glucose starvation stress, most often in the 5' UTR; found associated with small nucleolar RNAs snR10 and snR11; binds eIF4G; HMT1-dependent arginine monomethylation important for stress granule localization during glucose starvation and for eIF4G binding; contains an RGG motif; found in cytoplasmic P bodies and stress granules; SBP1 has a paralog, RNP1, that arose from the whole genome duplication