TR3.5

DNA Structures

Houjun Liu 2021-09-27 Mon 12:00

1 DNA Structures

1.1 DNA double helix

The unwrapped, raw DNA pre-bundling or formation of any structures.

1.2 Nucleosomes

A stack of 2 histone groups to create a spool of 8 histone proteins wrapping DNA

1.3 Histones

Coiler proteins that DNA wraps around to form more advanced structures

  • Each group of histones contains 4 parts (hence 4 (per group) x 2 (groups) = 8 histones)
    • H3, H4, H2a, H2b are the 4 wrapping proteins
    • H1 is the histone that seals the group of 4 together

1.4 Chromatin

Wrapping nucleosomes into a large, fiberous structure

1.5 Chromasome

The entangling 2 chromatin together. This is the structure that is split in half during cell replication

levelsofdna.png

Figure 1: levelsofdna.png

histones.png

Figure 2: histones.png