Mushroom games its energy by decomposing the tissues of dead organisms are mushrooms be classified as auto troughs heterotrophs are both groups or in neither group and for what reason

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?