Abstract
Escherichia coli translational initiation factor 3 (IF3) may be crosslinked to the 3' end of 16S RNA in 30S ribosomal subunits. In order to determine the sequence to which IF3 may bind in vivo, samples of 5'-32P labelled 3' terminal 49-nucleotide fragment of 16S RNA were incubated 5 min. at 37 degrees in 40 mM Tris-HOAc, pH 7.4, 100 mM NaCl, 1 mM Mg (OAc)2, 1 mM ZnSO4, with or without IF3, then reacted a further 5 min with nuclease S1, RNase T1, or RNase A. Base pairing between the 5' and 3' legs of the fragment occurs in the absence of IF3, but is disrupted by IF3 binding. IF3 appears to protect some residues near the 5' end of the fragment (U1495, A1499, A1500, A1502, and A1503) from nuclease S1, and potentiates S1 attack on others (G1494, G1497, C1501, G1504, G1505, U1506, G1517, G1529, G1530, and C1533). A series of equimolar reactions at increasing dilution imply an association constant range of 1.4-7.0 X 10(7) M-1.
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Selected References
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