Histones

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In order for DNA to be packaged tightly enough to fit into a chromosome, it wraps around proteins called Histones, located in the nucleus of a cell[1].

Histones can be organized into six classes:

  1. H1
  2. H2A
  3. H2B
  4. H3
  5. H4
  6. Archael

Without histones, DNA would be too long to fit within the nucleus.

Some other functions of histones include acetlyation, methylation, ubiquitination, and phosphorylation [2].

References

  1. ↑ http://en.citizendium.org/wiki/Histone
  2. ↑ http://www.iscid.org/encyclopedia/Histones


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