I think the two links below do a good job of summarizing what we know about prion proteins.
http://www.emergentuniverse.org/#/proteins
This first link is an interactive website with a creative design. You’ll see that when you place your curser over a note in the margins, more information will appear. I recommend exploring other parts of the site too, starting from the homepage. There are games, music, paintings, and a sad dance video scattered around the site to help explain different scientific concepts.
This second link is a short video, specifically about prions: https://www.youtube.com/watch?v=pqhpVpafjmk