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. 1998 Jul 1;12(13):1998–2012. doi: 10.1101/gad.12.13.1998

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Copyright © 1998, Cold Spring Harbor Laboratory Press

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SR protein specificity of in vitro-selected ESEs. (A) SRp40-selected ESEs are inactive with SF2/ASF. Splicing was carried out in HeLa S100 extract complemented with 20 pmoles of SF2/ASF (lanes 1,4,7,10,13,16,19), 20 pmoles of SRp40 (lanes 2,5,8,11,14,17,20), or 20 pmoles of SF2/ASF plus 20 pmoles of SRp40 (lanes 3,6,9,12,15,18,21). (B) SRp40-selected ESEs can function in the presence of SRp55. Splicing was carried out in S100 extract complemented with 20 pmoles of SRp55 (lanes 1,4,7,10,13,16), 20 pmoles of SRp40 (lanes 2,5,8,11,14,17), or 20 pmoles of SRp55 plus 20 pmoles of SRp40 (lanes 3,6,9,12,15,18).

SR protein specificity of in vitro-selected ESEs. (A) SRp40-selected ESEs are inactive with SF2/ASF. Splicing was carried out in HeLa S100 extract complemented with 20 pmoles of SF2/ASF (lanes 1,4,7,10,13,16,19), 20 pmoles of SRp40 (lanes 2,5,8,11,14,17,20), or 20 pmoles of SF2/ASF plus 20 pmoles of SRp40 (lanes 3,6,9,12,15,18,21). (B) SRp40-selected ESEs can function in the presence of SRp55. Splicing was carried out in S100 extract complemented with 20 pmoles of SRp55 (lanes 1,4,7,10,13,16), 20 pmoles of SRp40 (lanes 2,5,8,11,14,17), or 20 pmoles of SRp55 plus 20 pmoles of SRp40 (lanes 3,6,9,12,15,18).