Nucleic Acids Research, 1985, Vol. 13, No. 4 1103-1118
© 1985
Articles |
Single stranded DNA SP6 promoter plasmids for engineering mutant RNAs and proteins: synthesis of a ‘stretched’ preproparathyroid hormone
Department of Physiology and Biophysics and College of Medicine at Urbana-Champaign, University of Illinois Urbana, IL 61801, USA
Received December 17, 1984. Accepted January 28, 1985.
The intergenic region of bacteriophage f1 has been subcloned into the bacteriophage SP6 promoter plasmids, pSP64 and pSP65, in both orientations. Coinfection of E. coli with these SP6 promoter/phage f1 chimeric plasmids and the interference resistance phage, IR1, results in the replication and secretion of the pSP6.f1 plasmids as single stranded DNA. Bovine preProPTH cDNAs in both the native form and a form containing an insertion of 117 base pairs in the protein coding region have been inserted in these plasmids. The RNA transcribed from the SP6.F1/preProPth cDNA consructs was efficiently translated in the wheat germ or reticulocyte cell free systems without addition of a 7-methylguanosine cap to the RNA. In the presence of dog pancreatic or chicken oviduct microsomal membranes, conversion of the resultant pre-proteins to pro-proteins was observed. Confirmation of the "mutated" preProPTH cDNA was determined by dideoxyribonucleotide DNA sequencing of single stranded plasmid DNA. These vectors are suitable for the efficient biosynthesis of large amounts of single or double stranded DNA, and translationally active RNA. The combined properties of single stranded DNA replication and the SP6 promoter simplify the engineering of mutant RNAs and their corresponding proteins. In addition, single stranded DNA or RNA corresponding to either complementary strand may be synthesized as nucleic acid hybridization probes.
+Permanent address: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02–532 Warsaw, Poland
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