Proteins are present in all living things, [...] plants, bacteria, and viruses[, fungi, and animals].
Here is the portal to a game about protein folding.
You can link to other information on specific proteins from the game website. For example, http://www.pdb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb79_1.html, is a link to proteins related to Alzheimer's.
What do you know about proteins already? How do you know that? Have you done any laboratory activities or experiments on or with proteins?
See http://www.njit.edu/precollege/competitions/olympiad.php for competitions on proteins.