The Hsp90-chaperone system functions in complexes with various partner proteins including the large peptidyl-prolyl cis/trans isomerases (PPIases) FKBP51, FKBP52 and Cyp40. In contrast to these, there is only one partner of the respective other partner proteins present in the complex. In this work, the large PPIases have been purified and compared concerning their function. The analysis showed that the PPIases don't differ much in their structure und PPIase-activities, but show different interactions with Hsp90 and non-native proteins. These features may be the basis for the differential incorporation of the large PPIases into the Hsp90-receptor complex. Furthermore, their two main activities, PPIase and chaperone activity, could be assigned to distinct regions in the protein.
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The Hsp90-chaperone system functions in complexes with various partner proteins including the large peptidyl-prolyl cis/trans isomerases (PPIases) FKBP51, FKBP52 and Cyp40. In contrast to these, there is only one partner of the respective other partner proteins present in the complex. In this work, the large PPIases have been purified and compared concerning their function. The analysis showed that the PPIases don't differ much in their structure und PPIase-activities, but show different interac...
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