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Limited proteolysis of APOBEC-1 complementation factor (ACF) and computational secondary structure modeling were used to guide the construction of a well-folded, truncation protein spanning residues 1–320 and containing three RNA recognition motifs (RRMs). ACF320 bound preferentially to apoB mRNA and supported APOBEC-1 dependent editing at 40% of the activity of full length ACF. Live cell FRET and...