Mice hyperimmunized with polyinosinic . polycytidylic acid complexed with methylated bovine serum albumin were protected against challenge with Friend leukemia virus. The virus was inoculated at the time when anti bodies reacting to the polynucleotide structure had reached an appreciable level. A sparing effect of approximately 1.5 logs in infectivity was afforded the immunized mice. Our result...

Synthetic 2-stranded RNA-a helical complex formed by duplexing homopolymers of polyriboinosinic and polyribocytidylic acids (poly I:C)-induced host resistance to foot-and-mouth disease virus when microgram quantities were injected into mice. There was a graded response as shown by titrations of polynucleotide complex or virus. Protection was effective for >48 hours after a single injection of p...

The adsorption of a synthetic heparinoid polyelectrolyte on poly (vinylchloride) previously treated with tridodecylmethylammonium chloride (TDMAC) was studied using radiotracer techniques to provide a more quantitative picture of antithrombogenic surface coatings. 125I-labeled polyelectrolyte was used for overall adsorption measurements. Experiments with 36Cl-labeled TDMAC yielded information o...

Complexation of a polyelectrolyte with an oppositely charged spherical macroion is studied for both salt free and salty solutions. When a polyelectrolyte winds around the macroion, its turns repel each other and form an almost equidistant solenoid. It is shown that this repulsive correlations of turns lead to the charge inversion: more polyelectrolyte winds around the macroion than it is necess...

Nanoscale pores have potential to be used as biosensors and are an established tool for analysing the structure and composition of single DNA or RNA molecules. Recently, nanopores have been used to measure the binding of enzymes to their DNA substrates. In this technique, a polynucleotide bound to an enzyme is drawn into the nanopore by an applied voltage. The force exerted on the charged backb...

Polynucleotide phosphorylase, a 3' to 5' processive exoribonuclease is post-transcriptionally autocontrolled and it was previously shown that this control is dependent on a 5' processing by RNase III. In this paper, the mechanism of regulation is analyzed by studying the properties of a pnp-lacZ translational gene fusion. It is shown that this message is stable, even when processed by RNase III...

Many substances which do not react with DNA directly are metabolized into important DNA-modifying intermediates. We have devised a method for trapping these intermediates with 14C-labeled nucleosides contained in a synthetic polynucleotide. The polynucleotide structure protects the labeled nucleoside from metabolism; thus, it is unaltered when the polymer is incubated with a drug-metabolizing s...

Three murine monoclonal anti-ssDNA autoantibodies have been produced by fusion of spleen cells from NZB/NZW F1 hybrid mice with Sp2/0-Ag 14 murine myeloma cells. Specificity studies characterizing monoclonal anti - ssDNA autoantibodies revealed binding patterns for nucleotides. Clone E-4-1 showed preferential binding with mono-di-and polyguanosine. Clones E-4-4 and E-11-1 specitically bound mon...