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    Genes Dev. 1992 May;6(5):837-47.

    SR proteins: a conserved family of pre-mRNA splicing factors.

    Zahler AM, Lane WS, Stolk JA, Roth MB.

    Fred Hutchinson Cancer Research Center, Division of Basic Sciences, Seattle, Washington 98104.

    We demonstrate that four different proteins from calf thymus are able to restore splicing in the same splicing-deficient extract using several different pre-mRNA substrates. These proteins are members of a conserved family of proteins recognized by a monoclonal antibody that binds to active sites of RNA polymerase II transcription. We purified this family of nuclear phosphoproteins to apparent homogeneity by two salt precipitations. The family, called SR proteins for their serine- and arginine-rich carboxy-terminal domains, consists of at least five different proteins with molecular masses of 20, 30, 40, 55, and 75 kD. Microsequencing revealed that they are related but not identical. In four of the family members a repeated protein sequence that encompasses an RNA recognition motif was observed. We discuss the potential role of this highly conserved, functionally related set of proteins in pre-mRNA splicing.

    PMID: 1577277 [PubMed - indexed for MEDLINE]

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