Cell Stress and Chaperones

, Volume 15, Issue 4, pp 443–455 | Cite as

The co-chaperone SGT of Leishmania donovani is essential for the parasite's viability

  • Gabi Ommen
  • Mareike Chrobak
  • Joachim ClosEmail author
Original Paper


Molecular chaperone proteins play a pivotal role in the protozoan parasite Leishmania donovani, controlling cell fate and ensuring intracellular survival. In higher eukaryotes, the so-called co-chaperone proteins are required for client protein recognition and proper function of chaperones, among them the small glutamine-rich tetratricopeptide repeat proteins (SGT) which interact with both HSP70 and HSP90 chaperones. An atypical SGT homolog is found in the L. donovani genome, encoding a protein lacking the C-terminal glutamine-rich region, normally typical for SGT family members. The gene is expressed constitutively during the life cycle and is essential for survival and/or growth of the parasites. LdSGT forms large, stable complexes that also include another putative co-chaperone, HSC70 interacting protein (HIP). The gene product forms cytoplasmic clusters, matching the subcellular distribution of HIP and partly that of the major cytoplasmic chaperones, HSP70 and HSP90, reflecting a direct molecular interaction with both chaperones.


Leishmania Tetratricopeptide repeat SGT Foldosome complex Co-chaperone 



The authors acknowledge the technical assistance of Dorothea Zander, Manfred Krömer (died 2009), and Stefanie Pflichtbeil. Doreen Gutzke created the pTL.v3-eGFP plasmid. M.C. was a fellow of the Vereinigung der Freunde des Tropeninstituts e.V., Hamburg. We also thank Wai-Lok Yau for the helpful suggestions.

Supplementary material

12192_2009_160_MOESM1_ESM.pdf (91 kb)
Supplementary Fig. 8 Cloning strategy of pTL-LdSGT::eGFP, an expression vector for stable expression of LdSGT::eGFP fusion proteins in Leishmania. The figure illustrates the materials and methods, construction, and preparation of overexpression systems (PDF 91 kb)


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Copyright information

© Cell Stress Society International 2009

Authors and Affiliations

  1. 1.Bernhard Nocht Institute for Tropical MedicineHamburgGermany

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