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Summary: Translation efficiency contributes several orders of magnitude difference in the overall yield of exogenous gene expression in bacteria. In diverse bacteria, the translation initiation site, whose sequence is the primary determinant of the translation performance, is comprised of the start codon and the Shine–Dalgarno box located upstream. Here, we have examined how the sequence of a spacer between these main components of the translation initiation site contributes to the yield of synthesized protein. We have created a library of reporter constructs with the randomized spacer region, performed fluorescently activated cell sorting and applied next‐generation sequencing analysis (the FlowSeq protocol). As a result, we have identified sequence motifs for the spacer region between the Shine–Dalgarno box and AUG start codon that may modulate the translation efficiency in a 100‐fold range. [ABSTRACT FROM AUTHOR]

Modified oligonucleotides bearing 2′-reactive groups or 2′-conjugated molecules have found wide application as structural tools in molecular biology. Of principal interest has been the use of 2′-reactive oligonucleotides for cross-linking with biomolecules and of 2′-conjugated oligonucleotides in hybridization assays. In this review we compare a range of electrophilic, nucleophilic and photoreactive groups for cross-linking and conjugation studies. IUBMB Life, 56: 209-214, 2004 [ABSTRACT FROM AUTHOR]