The crescent-shaped structure of PUF proteins reveals two extended surfaces. Based on the location and effects ofmutations, one surface probably binds to regulatory proteins and the other surface probably binds to:

A. ribosomal proteins increasing the association of ribosomes to the 5' end of the ribosome tRNA binding site.
B. specific sequences in the 3' UTR of mRNA.
C. the nuclearAAUAAA polyadenylation sequence.
D. the peptidyl (P) site on the 40Sribosomal subunit.


B

Biology & Microbiology

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