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- W2065996961 abstract "Kinetoplast DNA (kDNA) and kinetoplast RNA (kRNA) were isolated from bloodstream and procyclic culture forms of two clonal strains of Trypanosoma brucei. No differences were observed in kDNA (maxicircle) restriction profiles between bloodstream or procyclic culture forms of the same strain. Some differences were observed in kDNA maxicircle restriction sites between the two strains. Buoyant density analysis of Pst I digested kDNA showed the release of a minor low density band representing unit length linearized maxicircle DNA. Pst I or Bam H1-linearized maxicircle DNA was isolated by the Hoechst 33258 dye-CsC1 method and a restriction enzyme map of the maxicircle was constructed. Closed monomeric minicircles released from kDNA networks by sonication sedimented with a molecular size of around 1100 base pairs. A substantial minor length heterogeneity was evident in acrylamide gel electrophoresis of once cut minicircles. Several minicircle sequence classes and two Hind III maxicircle fragments representing approx. 50% of the maxicircle were cloned in the bacterial plasmid, pBR322, in Escherichia coli. A purified kinetoplast-mitochondrion fraction was isolated from procyclic culture forms by the Renografin flotation method. The major kRNA components were two small RNAs which comigrated with Leishmonia tarentolae 9 and 12 S kRNAs in denaturing gels. These RNAs hybridized to the maxicircle component of the kDNA, specifically to the smaller cloned Hind III maxicircle fragment. This cloned fragment had substantial sequence homology with the cloned maxicircle fragment from L. tarentolae which contains the 9 and 12 S RNA genes, implying an evolutionary conservation of the 9 and 12 S gene sequences. Identical kRNAs were observed in cultured bloodstream forms of T. brucei." @default.
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- W2065996961 date "1980-01-01" @default.
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- W2065996961 title "Kinetoplast DNA and RNA of Trypanosoma brucei" @default.
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- W2065996961 doi "https://doi.org/10.1016/0166-6851(80)90034-1" @default.
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