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Mitochondria contribute significantly to the cellular production of ROS. The deleterious effects of increased ROS levels have been implicated in a wide variety of pathological reactions. Apart from a direct detoxification of ROS molecules, protein quality control mechanisms are thought to protect protein functions in the presence of elevated ROS levels. The reactivities of molecular chaperones and...
Many mitochondrial proteins are synthesized with N-terminal presequences that are removed by specific peptidases. The N-termini of the mature proteins and thus peptidase cleavage sites have only been determined for a small fraction of mitochondrial proteins and yielded a controversial situation for the cleavage site specificity of the major mitochondrial processing peptidase (MPP). We report a global...
The cellular role of Hsp100/Clp chaperones in maintaining protein stability is based on two functional aspects. Under normal growth conditions they represent components of cellular protein quality control machineries that selectively remove damaged or misfolded polypeptides in cooperation with specific proteases. After thermal stress, proteins of the ClpB subfamily have the unique ability to directly...
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