How does circular DNA wrap around a histone to form a chromosome?

  1. How does circular DNA wrap around a histone to form a chromosome? Or does it?

    I am having a hard time visualizing this for any sort of circular DNA: prokaryotes, mitochondria, etc.

    (This question was inspired by my reading about biology and reading that circular DNA does, in fact, form chromosomes. So, now I'm wondering how?)
     
  2. jcsd
  3. tiny-tim

    tiny-tim 26,041
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    come on, guys …

    somebody must know the answer to this! :smile:
     
  4. chemisttree

    chemisttree 3,721
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  5. Histone are proteins made up of amino acids (basic) ex. lysine and arginine , that are positively charged.on the other hand DNA contains phosphorus backbone(PO4 3-). so this is an electrostatic attraction and nothing else.
    also, some transcription regulatory machinery regulates this wrapping otherwise the length of DNA is 2.2m in Humans.
    Due to this euchromatin and Heterochromatin is seen under Electrophoresis and DNA banding patterns.
     
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