Volume 30, no. 10, p. 2411-2423, 2010. Since publication of this paper, we have become aware of a mistake in the identity of the photo-cross-linking probe used to map the domain of DmSNAP190 that cross-linked to phosphate position 24 of the U1 proximal sequence element A (PSEA). The probe used to generate the data presented in Fig. 2 (lanes 1 to 3) and (lanes 13 to 18) was in fact not a position 24 probe; instead, a U1 PSEA phosphate position 12 probe was used in error. Reperformance of these experiments with the correct probe revealed that phosphate position 24 of the U1 PSEA cross-linked to a region of DmSNAP190 located between amino acid residues 169 and 247 rather than between residues 306 and 358. None of the other conclusions of the publication were affected. We sincerely regret this error and any inconvenience that may have resulted to our colleagues.
Page 2414, Fig. 2, lanes 1-3: Although this panel was generated with the misidentified probe, the results of the experiment were the same when performed with the correct probe for U1 PSEA position 24 (data not shown). The conclusion that phosphate position 24 cross-linked to the N-terminal half of DmSNAP190 was not affected.
Page 2416: , lanes 13-18, should appear as shown below. These results indicate that position 24 of the U1 PSEA cross-linked to DmSNAP190 C terminal of amino acid residue 169 but N terminal of residue 247 inclusive.
Page 2416, : The bar for cross-linking to U1 PSEA position 24 should be between residues 169 and 247.
Page 2421, column 2: should appear as shown below because DmSNAP190 residues between 169 and 247 contact position 24 of the U1 PSEA. (Although the domain of DmSNAP190 encompassed by residues 248 to 305 does not contact the U1 PSEA at nucleotide positions 1, 12, or 24, it may contact the U1 PSEA at other positions.)
