The binding of aminoacyl-sRNA's to ribosomes stimulated by block oligonucleotides

A unified view of the initiation of protein synthesis

The mechanism of the initiation of protein synthesis is discussed in terms of two different hypotheses in which each emphasized a different possible element of the process: the Shine-Dalgarno (SD) hypothesis ascribed an essential role to recognition of the SD segment by the ribosomal RNA; it is supported by a variety of experiments but conflicting evidence negates its obligatory nature. In contrast, our hypothesis highlighted the role of the structure of the mRNA and proposes that the initiation codon is selected by virtue of its unique accessibility. The rationale for the importance of accessibility in the selection of the initiation site is discussed. An analysis and a recapitulation of the initiation process and ribosomal specificity are presented. The apparent conflicts with the SD hypothesis are resolved in a unified mechanism where accessibility is the dominant factor.

ENZYMATIC SYNTHESIS OF TRI- AND TETRANUCLEOTIDES OF DEFINED SEQUENCE

Conditions have been found under which polynucleotide phosphorylase adds only a few nucleotide residues to the 3' end of a dinucleotide primer. Pure tri- and tetranucleotides can be isolated from reaction mixtures in high yield.

The polarity of messenger translation in protein synthesis

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