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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A new regulatory protein, KSRP, mediates exon inclusion through an intronic splicing enhancer.

We have purified and cloned a new splicing factor, KSRP. KSRP is a component of a multiprotein complex that binds specifically to an intronic splicing enhancer element downstream of the neuron-specific c-src N1 exon. This 75-kD protein induces the assembly of five other proteins, including the heterogeneous nuclear ribonucleoprotein F, onto the splicing enhancer. The sequence of the KSRP cDNA indicates that the protein contains four K homology RNA-binding domains and an unusual carboxy-terminal domain. KSRP is similar to two proteins, FUSE-binding protein and P-element somatic inhibitor. KSRP is expressed in both neural and non-neural cell lines, although it is present at higher levels in neural cells. Antibodies specific for KSRP inhibit the splicing of the N1 exon in vitro. Moreover, this inhibition of N1 splicing can be rescued by the addition of purified KSRP. KSRP is likely to regulate splicing from a number of intronic splicing enhancer sequences.[1]


  1. A new regulatory protein, KSRP, mediates exon inclusion through an intronic splicing enhancer. Min, H., Turck, C.W., Nikolic, J.M., Black, D.L. Genes Dev. (1997) [Pubmed]
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