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. 1976 May;18(2):709–718. doi: 10.1128/jvi.18.2.709-718.1976

Low-molecular- weight Rauscher leukemia virus protein with preferential binding for single-stranded RNA and DNA.

J Davis, M Scherer, W P Tsai, C Long
PMCID: PMC515599  PMID: 58075

Abstract

A sensitive nitrocellulose filter assay that measures the retention of 125I single-stranded calf thymus DNA has been used to detect and purify DNA-binding proteins that retain a biological function from Rauscher murine leukemia virus. By consecutive purification on oligo (dT)- cellulose and DEAE-Bio-Gel columns and centrifugation in 10 to 30% glycerol gradients, RNA-dependent DNA polymerase has been separated from a second virion DNA-binding protein. The binding of this protein to DNA was strongly affected by NaCl concentration but showed little change in activity over a wide range of temperature or pH. After glycerol gradient purification, polyacrylamide gel electrophoresis of this protein showed one major band with a molecular weight of approximately 9,800. This protein binds about as well as to single-stranded Escherichia coli or calf thymus DNA or 70S type C viral RNA. The binding to 125I single-stranded calf thymus DNA is very efficiently inhibited by unlabeled single-stranded DNA from either E. coli or calf thymus and by 70S murine or feline viral RNA. Much larger amounts of double-stranded DNA are required to produce an equivalent percentage of inhibition. This protein, therefore, shows preferential binding to single-stranded DNA or viral RNA.

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Selected References

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