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Kalel, V.C.* ; Li, M.* ; Gaussmann, S. ; Delhommel, F. ; Schaefer, A.* ; Tippler, B.* ; Jung, M.* ; Maier, R.* ; Oeljeklaus, S.* ; Schliebs, W.* ; Warscheid, B.* ; Sattler, M. ; Erdmann, R.*

Evolutionary divergent PEX3 is essential for glycosome biogenesis and survival of trypanosomatid parasites.

Biochim. Biophys. Acta-Mol. Cell Res. 1866:118520 (2019)
Postprint DOI
Open Access Green
Trypanosomatid parasites cause devastating African sleeping sickness, Chagas disease, and Leishmaniasis that affect about 18 million people worldwide. Recently, we showed that the biogenesis of glycosomes could be the "Achilles' heel" of trypanosomatids suitable for the development of new therapies against trypanosomiases. This was shown for inhibitors of the import machinery of matrix proteins, while the distinct machinery for the topogenesis of glycosomal membrane proteins evaded investigation due to the lack of a druggable interface. Here we report on the identification of the highly divergent trypanosomal PEX3, a central component of the transport machinery of peroxisomal membrane proteins and the master regulator of peroxisome biogenesis. The trypanosomatid PEX3 shows very low degree of conservation and its identification was made possible by a combinatory approach identifying of PEX19-interacting proteins and secondary structure homology screening. The trypanosomal PEX3 localizes to glycosomes and directly interacts with the membrane protein import receptor PEX19. RNAi-studies revealed that the PEX3 is essential and that its depletion results in mislocalization of glycosomal proteins to the cytosol and a severe growth defect. Comparison of the parasites and human PEX3-PEX19 interface disclosed differences that might be accessible for drug development. The absolute requirement for biogenesis of glycosomes and its structural distinction from its human counterpart make PEX3 a prime drug target for the development of novel therapies against trypanosomiases. The identification paves the way for future drug development targeting PEX3, and for the analysis of additional partners involved in this crucial step of glycosome biogenesis.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Protein Import; Blood-stream; Functional-characterization; Inducible Expression; Zellweger-syndrome; Membrane-proteins; Brucei; Identification; Peroxisomes; Pex19p
ISSN (print) / ISBN 0167-4889
e-ISSN 1879-2596
Quellenangaben Volume: 1866, Issue: 12, Pages: , Article Number: 118520 Supplement: ,
Publisher Elsevier
Publishing Place Radarweg 29, 1043 Nx Amsterdam, Netherlands
Reviewing status Peer reviewed