Abstract
Eukaryotic peptidyl-prolyl cis-trans isomerases (rotamases) fall into two classes, the cyclophilins inhibited by cyclosporin A and the FK506-binding proteins inhibited by the macrolide antibiotic FK506. In prokaryotes homologs of cyclophilins have been identified and found to have rotamase activity. Sequence similarities have been noted between FK506-binding proteins and gene products in a number of bacterial species, but whether these bacterial proteins have rotamase activity is not known. Using the polymerase chain reaction, we have cloned and sequenced a homolog of an FK506-binding protein from Neisseria meningitidis and expressed the gene product as a fusion protein with maltose-binding protein. The fusion protein was purified by affinity chromatography. By measuring the rate of chymotrypsin cleavage of the substrate succinyl-Ala-Ala-Pro-Phe p-nitroanilide, we found that the fusion protein had rotamase activity comparable to that of human FK506-binding protein. This rotamase activity was inhibited by FK506.
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Selected References
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