Nucleic Acids Research, 1977, Vol. 4, No. 9 3187-3198
© 1977
Articles |
Purification of cDNA complementary to sea urchin histone mRNA
Department of Biochemistry, University of Cape Town, Rondebosch 7700 Republic of South Africa
Received June 28, 1977. Complementary DNA (cDNA) was transcribed from a polyadenylated sea urchin histone mRNA preparation isolated by density gradient centrifugation. By hybridization, this cDNA was shown to be extensively contaminated (85% of hybridizable cDNA) with DNA complementary to RNA derived from the large ribosomal subunit. Purification of a mRNA specific cDNA fraction was achieved by hybridization of purified rRNA to cDNA followed by fractionation on hydroxylapatite. After further purification to remove nonhybridizable cDNA our purified cDNA showed only 8% hybridization to rRNA.