Abstract
Eukaryotic cells contain several thousands of proteins that have to be accurately partitioned over the components of the cytoplasm (cytosol or any of the known organelles) to allow proper cell function. To this end, various specific topogenic signals have been designed as well as highly selective protein translocation machineries that ensure that each newly synthesized polypeptide reaches its correct subcellular destination or, in case of secretory proteins, is exported to the cell exterior. This contribution gives an overview regarding the principles of the main examples of polypeptide sorting and translocation, with emphasis on the function of cofactor binding in peroxisomal matrix protein import.
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