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We have constructed 14 independent point mutations in the conserved AAUAAA element of the SV40 late polyadenylation signal in order to study the recognition and function of alternative polyadenylation signals. A variant RNA containing an AUUAAA was polyadenylated at 20% the level of wild-type substrate RNA, while all other derivatives tested were not functional in vitro. The AUUAAA variant RNA formed specific complexes in native polyacrylamide gels and crosslinked to the AAUAAA-specific 64kd polypeptide, but at a lower efficiency than wild-type substrate RNA.

Functional analysis of point mutations in the AAUAAA motif of the SV40 late polyadenylation signal