Rapid replication: Non‐enzymatic primer extension has previously been studied in the context of prebiotic chemistry, but not for practical applications. Reactions with primers featuring a 3′‐amino‐2′,3′‐dideoxynucleotide can be rapid and selective for all four templating nucleobases (see scheme). On a chip with immobilized capture strands, 500 fmol of template suffice for single‐nucleotide determinations within 2.7 h.
Rasche Replikationsschritte: Die nichtenzymatische Primerverlängerung wurde bislang nur bei Fragen der präbiotischen Chemie, nicht aber für praktische Anwendungen eingesetzt. Reaktionen mit Primern, die ein 3′‐Amino‐2′,3′‐didesoxynucleotid enthalten, können für alle vier als Template dienenden Nucleobasen schnell und selektiv sein (siehe Schema). Auf einem Chip mit immobilisierten DNA‐Sonden genügen 500 fmol Templat für Einzelnucleotidbestimmungen innerhalb von 2.7 h.
A modularly built bisubstrate inhibitor, the natural product pepticinnamin E (shown on the right) was sythesized for the first time. In the case of in vitro assays it inhibits the enzyme farnesyltransferase with respect to both the peptide substrate and farnesylpyrophosphate (K = 30 and 8 μM, respectively). The inhibitory activity is decisively influenced by the central tripeptide unit and the absolute configuration of the non-proteinogenic amino acid incorporated therein.
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