In this contribution we discuss the potential of methylotrophic yeasts as hosts for the high level production of valuable foreign proteins. Recent relevant achievements on the intracellular production or secretion of proteins are summarized. Special attention is paid to a specific advantage of the use of methylotrophic yeasts, namely the possibility of accumulating the foreign gene products inside peroxisomes. This approach may be of major advantage when the protein product is toxic for the host cell and, also, to protect these proteins from undesired side-effects such as proteolysis or aggregation.
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