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Nucleic Acids Research, 1978, Vol. 5, No. 4 1403-1412
© 1978

Articles

Short RNA chains synthesized at low pH are initiated at promoter sites

U. Wienand+, E. Beck and E. Fuchs

Institut für Molekulare Genetik and Institut für Mikrobiologie der Universität Im Neuenheimer Feld 230, D-69 Heidelberg, GFR

Received March 3, 1978.

Under non optimal conditions- either with limiting substrate concentrations (1) or at low pH (2)- RNA polymerase of Escherichia coli synthesizes very short RNA chains. By sequencing one RNA species synthesized at pH 5.8 upon T7 DNA we were able to demonstrate that under these conditions transcription is initiated at a normal promoter site (here A1) but however is terminated soon afterwords at specific artificial sites not used in vivo.

+Present address: Institut für Biologie III, Schänzlestr. 9-11, D-78 Freiburg, GFR


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