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Hypochromicity and circular dichroism data are reported for the 2' and 3'-0-aminiacyldinucleoside phosphates cytidylyl-(3'-5')-2'(3')-0-L-phenylalanyl-adenosine, cytidylyl-(3'-5')-2'-deoxy-3'-0-L-phenylalanyladenosine, cytidylyl-(3'-5')-2'-deoxy-3'-0-glycyladenosine, and cytidylyl-(3'-5')-3'-deoxy-2'-0-L-phenylalanyladenosine, all of which can act as analogs of the 3' terminus of AA-tRNA in various partial reactions of protein biosynthesis. Although all these systems have a 2'-OH group in the furanose of the 3'-residue, differences exist in the extent and/or mode of base-base overlap for most of them, except for cytidylyl-(3'-5')-2'(3')-0-L-phenylalanyladenosine and cytidylyl-(3'-5')-3'-deoxy-2'-0-L-phenylalanyladenosine. It is concluded that the biological activity of the above analogs is affected both by the position of the aminoacyl group and the stacking properties of the bases.

Spectroscopic properties of various 2'(3')-O-aminoacyldinucleoside phosphates analogous to the 3' terminus of AA-tRNA