If you have more time to spare and you are up for a challenge, take a look at the nucleosome. Right click here and save as pdb file. Open it from within spdbv. You might want to do some of the future exercises with the nucleosome in addition to the ATPases - thus save the pdb file, where you can find it again.
Align all the histones form the nucleosome to one reference histone and color in rmv:
The result might look something like this:
The picture shows a structure alignment of the 8 histones (2 each) that are part of the nucleosome. All the histones were colored regarding the match to H2A, except H2A, which was colored according to its match to H3. Coloring option RMS - shorter wavelengths - better match
Below same as last figure, but histones are depicted side by side :
Below are two views of the complete nucleosome. Histones H2A are depicted as spacefilling balls and RMS colored regarding their match to H3. The rest of the molecule is colored according to chain.