| pubmed-article:6414736 | pubmed:abstractText | A bacterial factor preventing precipitation of immune complexes was purified from a culture of Streptococcus faecalis (AK strain) by gel filtration on Sephadex G-100 and Bio-Gel A-150m columns. The factor was identified as DNA on the basis of its ultraviolet absorption maximum at 260 nm, hydrolysis by deoxyribonuclease, Mr exceeding 1.5 X 10(8), and positive reaction with diphenylamine. DNA interferes with the immunoassay by preventing precipitation of immune complexes. Only double-stranded DNA and polynucleotides showed this property. Evidently, double-stranded DNA will give false-positive interference with the usual RIA procedures. | lld:pubmed |
