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• W1490492607 abstract "We have analysed limit digests of mini-circles from kinetoplast DNA of Crithidia luciliae by gel electrophoresis. Endonucleases HapII and AluI cut the circles into at least 37 and 21 fragments, respectively, and leave no circles intact. In both cases the added molecular weights of the fragments, estimated from mobility in gels, exceeds 18 × 106, i.e. more than 12 times the molecular weight of the mini-circle DNA. Endonucleases HindII + III, EcoRI and HpaI cut only part of the circles. These results show that the mini-circles are heterogeneous in base sequence. Different sequence classes are present in different amounts. DNA-DNA renaturation analysis of mini-circle DNA yields a complexity of about 3 × 106, i.e. twice the molecular weight of one mini-circle. The Δtm of native and renatured duplexes is about 1 °C, showing that the sequence heterogeneity is a micro-heterogeneity. Electron microscopy, gel electrophoresis and sedimentation analysis show that the circles that are not cut by endonucleases HindII + III remain catenated in very large associations. These associations lack the ‘rosette’ structures and the long edge loops characteristic of intact kinetoplast DNA. This suggests that the mini-circle classes cut by endonucleases HindII + III are present throughout the network and that the maxi-circle component of the network (see accompanying paper) is not essential to hold the network together. Prolonged electrophoresis on 1.5% or 2% agarose gels resolves the open mini-circles into three and linearized mini-circles into four bands, present in different amounts. We conclude that the minicircles are also heterogeneous in size, the difference in size between the two extreme size classes being 4% of the contour length. Digestion with endonuclease HapII shows that at least three out of these four bands differ in sequence. Possible mechanisms that could account for the micro-heterogeneity in sequence of minicircles are discussed." @default.
• W1490492607 created "2016-06-24" @default.
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• W1490492607 date "1976-04-01" @default.
• W1490492607 modified "2023-10-08" @default.
• W1490492607 title "The Structure of Kinetoplast DNA. 1. The Mini-circles of Crithidia luciliae are Heterogeneous in Base Sequence" @default.
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• W1490492607 doi "https://doi.org/10.1111/j.1432-1033.1976.tb10282.x" @default.
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