After proteins of denatured, is it possible for them to go
back to their original formation? Like the white of eggs after being
cooked, is it possible for those proteins to renature?
As an egg is cooked, the egg white proteins (albumins) denature -- unfold
and refold randomly. You would never be able to "uncook" an egg by any
chemical treatment. However, inside every living cell, there are proteins
called chaperones whose job it is to renature proteins. As new proteins
are made, chaperones hang around to supervise (hence the name) and make
sure that new chain of amino acids gets folded correctly. If it should be
folded incorrectly, the chaperone can help stabilize the unfolded state
until the folding is done right.
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Update: June 2012