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1

Leucine-rich repeats in host-pathogen interactions

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Kedzierski J., Montgomery J., Curtis J., Handman E.
Archivum Immunologiae et Therapiae Experimentalis
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2004
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vol. 52
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issue 2
104-112
EN
Leucine-rich repeats (LRRs) are versatile binding motifs found in a variety of proteins and are involved in protein-protein interactions. The LRR domain is composed of repeats forming a characteristic solenoid horse-shoe structure, which provides a scaffold for numerous insertions involved in binding to pathogen-associated molecular patterns and surface receptors. LRRs have been shown to be involved in the host defense systems of both plants (resistance genes) and mammals (Toll-like receptors and nucleotide-binding oligomerisation domain proteins), where they sense specific pathogen-associated molecules and activate the innate immune system. Paradoxically, LRRs have also been shown to be part of microbial virulence factors involved in the interaction with host cells and establishment of infection. The potential of LRRs to bind a vast array of structurally unrelated ligands and their well-documented involvement in microbial pathogenesis make them a potential target for vaccines and new drugs. The recent identification of LRRs in the obligate intracellular protozoan parasite Leishmania and their participation in the macrophage-parasite interaction have added new insight into the role of LRRs in the host cell invasion.
2

Live attenuated Leishmania vaccines: a potential strategic alternative

100%
Silvestre R., Cordeiro-da-Silva A., Ouaissi A.
Archivum Immunologiae et Therapiae Experimentalis
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2008
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vol. 56
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issue 2
123-126
EN
Leishmaniasis causes significant morbidity and mortality worldwide, constituting an important public health problem. Leishmania infections cause a wide spectrum of diseases, ranging in severity from spontaneously healing skin lesions to fatal visceral disease. Attempts to develop an effective vaccine to control leishmaniasis have been shown to be feasible, but no vaccine is in active clinical use. The ability to create genetically modified parasites by eliminating virulence or essential genes is considered a powerful alternative in the development of an effective protective vaccine. Here, recent findings related to genetically defined live attenuated Leishmania parasites as promising vaccine candidates are reviewed.
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