4fzc
20S yeast proteasome in complex with cepafungin I
Structural highlights
FunctionPSA2_YEAST The proteasome degrades poly-ubiquitinated proteins in the cytoplasm and in the nucleus. It is essential for the regulated turnover of proteins and for the removal of misfolded proteins. The proteasome is a multicatalytic proteinase complex that is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. It has an ATP-dependent proteolytic activity. Publication Abstract from PubMedNatural products represent valuable lead structures for drug discovery. However, for most bioactive compounds no cellular target is yet identified and many substances predicted from genome analysis are inaccessible due to their life stage-dependent biosynthesis, which is not reflected in common isolation procedures. In response to these issues, an NMR-based and target-directed protease assay for inhibitor detection of the proteasome was developed. The methodology is suitable for one-shot identification of inhibitors in conglomerates and crude culture broths. The technique was applied for analysis of the different life stages of the bacterium Photorhabdus luminescens, which resulted in the isolation and characterization of cepafungin I (CepI), the strongest proteasome inhibitor described to date. Its biosynthesis is strictly regulated and solely induced by the specific environmental conditions determined by our methodology. The transferability of the developed technique to other drug targets may disclose an abundance of novel compounds applicable for drug development. One-shot NMR analysis of microbial secretions identifies highly potent proteasome inhibitor.,Stein ML, Beck P, Kaiser M, Dudler R, Becker CF, Groll M Proc Natl Acad Sci U S A. 2012 Nov 6;109(45):18367-71. doi:, 10.1073/pnas.1211423109. Epub 2012 Oct 22. PMID:23091006[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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