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RSK4 is a member of the family of 90-kDa ribosomal S6 kinases (1). These proteins are a class of serine/threonine kinases that are activated in response to various extracellular signals, including growth factors, polypeptide hormones and neurotransmitters (2). RSK4 is most abundantly expressed in brain and kidney. The predicted protein of 746 amino acids shows a high level of homology to three previously isolated members of the human RSK family. RSK2 is involved in Coffin-Lowry syndrome and nonspecific MRX. The localization of RSK4 in the interval that is commonly deleted in mentally retarded males together with the high degree of amino acid identity with RSK2 suggests that RSK4 plays a role in normal neuronal development (3).
