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FMRP is an RNA binding protein whose absence produces pathological manifestations of the fragile-X syndrome. FMRP is a component of mRNP complexes found in association with actively translating polyribosomes, RNA complexes trafficking in neurites, RNA granules in cytoplasm and, in  Drosophila , with the RNAi machinery. We report here the identification and characterization of a novel FMRP-interacting protein associated to polyribosomes as a component of mRNP complexes containing FMRP. We named this protein 82-FIP (82-kD FMRP Interacting Protein). FMRP interacts with 82-FIP through a novel interaction motif located in its N-terminal region. The distribution of 82-FIP in different areas of the brain is very similar to that of FMRP. However, unlike FMRP, 82-FIP is found in both nucleus and cytoplasm in some neurons, while it appears only cytoplasmic in others. Subcellular distribution of 82-FIP is cell cycle-dependent in cultured cells, suggesting that the composition of some FMRP-containing RNP complexes may be cell cycle-modulated.

82-FIP, a novel FMRP (Fragile X Mental Retardation Protein) interacting protein, shows a cell cycle-dependent intracellular localization