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    Mol Cell. 2003 Apr;11(4):965-76.

    Structural basis for the molecular recognition between human splicing factors U2AF65 and SF1/mBBP.

    Selenko P, Gregorovic G, Sprangers R, Stier G, Rhani Z, Krämer A, Sattler M.

    European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany.

    The essential splicing factors SF1 and U2AF play an important role in the recognition of the pre-mRNA 3' splice site during early spliceosome assembly. The structure of the C-terminal RRM (RRM3) of human U2AF(65) complexed to an N-terminal peptide of SF1 reveals an extended negatively charged helix A and an additional helix C. Helix C shields the potential RNA binding surface. SF1 binds to the opposite, helical face of RRM3. It inserts a conserved tryptophan into a hydrophobic pocket between helices A and B in a way that strikingly resembles part of the molecular interface in the U2AF heterodimer. This molecular recognition establishes a paradigm for protein binding by a subfamily of noncanonical RRMs.

    PMID: 12718882 [PubMed - indexed for MEDLINE]

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