not to get off topic, but I can’t let that one slide.
DNA is certainly coated in protein in it’s normal cellular state, but it is not itself a protein. Proteins are strings of Amino Acids (20 flavours) . DNA is a (generally) much longer string made up of (4 flavours) of Deoxyribonucleotides. DNA encodes the information for assembling proteins.
DNA definitely precipitates in alcohol, I have no doubt that some of that precipitate could be DNA. However, DNA is water soluble, so I don’t believe it is the majority constituent seen here, because it would not have been extracted with Ethanol, nor I suspect with Butane. I would certainly expect some the ppt seen to be denatured proteins. Again limited by their solubility in either of the solvents mentioned.