- 著者
-
Akira ISHIHAMA
Masayoshi ENAMI
Yoshikazu NISHIJIMA
Toshikazu FUKUI
Eiko OHTSUKA
Morio IKEHARA
- 出版者
- The Japanese Biochemical Society
- 雑誌
- The Journal of Biochemistry (ISSN:0021924X)
- 巻号頁・発行日
- vol.87, no.3, pp.825-830, 1980-03-01 (Released:2008-11-18)
- 参考文献数
- 23
The effects of 2'-substitutions of ATP on the substrate and inhibitor properties for RNA synthesis were studied in the poly(dAT)-dependent reaction of Escherichia coli RNA polymerase. In the presence of UTP, 2'-deoxy-2'-azidoadenosine 5'-triphosphate (AzTP) was incorporated into an acid-insoluble fraction at one-tenth of the rate of ATP incorporation; it thus acts as a competitive inhibitor for poly(AU) synthesis. On the other hand, another ATP analog, 2'-deoxy-2'-fluoroadenosine 5'-triphosphate (AfTP), was co-polymerized with UTP into acid-insoluble materials at a rate less than 1% of that of ATP incorporation; in addition, it exerted a strong but mixed-type inhibition on poly(AU) synthesis. Different modes of action of the two ATP analogs are discussed in connection with the specificity of substrate recognition by RNA polymerase.