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Microbiology and Molecular Biology Reviews, March 2002, p. 122-154, Vol. 66, No. 1
1092-2172/02/$04.00+0     DOI: 10.1128/MMBR.66.1.122-154.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Secretory Pathway of Trypanosomatid Parasites

Malcolm J. McConville,1* Kylie A. Mullin,1 Steven C. Ilgoutz,1 and Rohan D. Teasdale2

Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010,1 Institute for Molecular Bioscience and ARC Special Research Centre for Functional and Applied Genomics, The University of Queensland, St. Lucia, Brisbane 4072, Australia2

Summary: The Trypanosomatidae comprise a large group of parasitic protozoa, some of which cause important diseases in humans. These include Trypanosoma brucei (the causative agent of African sleeping sickness and nagana in cattle), Trypanosoma cruzi (the causative agent of Chagas' disease in Central and South America), and Leishmania spp. (the causative agent of visceral and [muco]cutaneous leishmaniasis throughout the tropics and subtropics). The cell surfaces of these parasites are covered in complex protein- or carbohydrate-rich coats that are required for parasite survival and infectivity in their respective insect vectors and mammalian hosts. These molecules are assembled in the secretory pathway. Recent advances in the genetic manipulation of these parasites as well as progress with the parasite genome projects has greatly advanced our understanding of processes that underlie secretory transport in trypanosomatids. This article provides an overview of the organization of the trypanosomatid secretory pathway and connections that exist with endocytic organelles and multiple lytic and storage vacuoles. A number of the molecular components that are required for vesicular transport have been identified, as have some of the sorting signals that direct proteins to the cell surface or organelles in the endosome-vacuole system. Finally, the subcellular organization of the major glycosylation pathways in these parasites is reviewed. Studies on these highly divergent eukaryotes provide important insights into the molecular processes underlying secretory transport that arose very early in eukaryotic evolution. They also reveal unusual or novel aspects of secretory transport and protein glycosylation that may be exploited in developing new antiparasite drugs.

* Corresponding author. Mailing address: Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia. Phone: 61-3-8344-5681. Fax: 61-3-9347-7730. E-mail: malcolmm{at}unimelb.edu.au.

Microbiology and Molecular Biology Reviews, March 2002, p. 122-154, Vol. 66, No. 1
1092-2172/02/$04.00+0     DOI: 10.1128/MMBR.66.1.122-154.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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