POLYCYTIDYLATE AND POLY(7-DEAZAGUANYLATE) - A PAIR OF COMPLEMENTARY TEMPLATES
Autor(en): | REMBOLD, H ROBINS, RK SEELA, F ORGEL, LE |
Stichwörter: | Biochemistry & Molecular Biology; CHEMICAL EVOLUTION; Evolutionary Biology; Genetics & Heredity; NUCLEOSIDE; OLIGOCYTIDYLATES; POLY(7-DEAZAGUANYLIC ACID); POLYCYTIDYLIC ACID; TEMPLATE-DIRECTED SYNTHESIS | Erscheinungsdatum: | 1994 | Herausgeber: | SPRINGER VERLAG | Enthalten in: | JOURNAL OF MOLECULAR EVOLUTION | Band: | 38 | Ausgabe: | 3 | Startseite: | 211 | Seitenende: | 214 | Zusammenfassung: | We have studied the template-directed oligomerization on polycytidylic acid of the 5'-phosphoro(2-methyl)imidazolides of a number of analogues of guanosine. None of the analogues reacted as efficiently as the original guanosine compound, and only the 7-deazaguanosine analogue gives a detectable yield of oligomers. Similar results are described for a reaction involving the intramolecular template-directed elongation of a short oligocytidylate primer. Oligocytidylates containing five or more cytidylate residues are extended on the single-stranded regions of poly(G). In the present study we show that these oligocytidylates are extended efficiently by reaction with cytidine-5'-phosphoro(2-methyl)imidazolide on a poly(7-deazaguanylic acid) template. The products are considerably longer than those obtained using a polyguanylic acid template. We believe that the formation of a tetrahelix inhibits the latter reaction, while poly(7-deazaguanylate) does not aggregate and, therefore, acts as a more efficient template. This work identifies for the first time a pair of homopolymers each of which facilitates the template-directed elongation of the other. |
ISSN: | 00222844 |
Zur Langanzeige