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Insertion sequence IS1 has two coding frames, insA and insB, which are essential for its transposition. Here, we show that a frameshifting event in the -1 direction from the 3' end region of the insA frame to an open reading frame (B' frame), extending from the 5' end of the insB frame, is involved in production of the InsA-B'-InsB fusion protein that has IS1 transposase activity. The frameshifting event is likely to have occurred at the sequence C where the insA frame overlaps the B' frame. Interestingly, this sequence is also present in one of the two sequences identified in retroviruses as frameshift signals for production of transframe polyproteins from the overlapping genes gag-pro or gag-pro-pol.

Frameshifting is required for production of the transposase encoded by insertion sequence 1.