期刊
BIOCHIMICA ET BIOPHYSICA ACTA-PROTEIN STRUCTURE AND MOLECULAR ENZYMOLOGY
卷 1549, 期 1, 页码 73-87出版社
ELSEVIER
DOI: 10.1016/S0167-4838(01)00240-0
关键词
amastigote; cDNA library screening; glucose regulated protein 78; Leishmania donovani
To identify novel potential Leishmania vaccine antigens., antibodies from patients with visceral leishmaniasis (VL) were used to isolate clones from a cDNA expression library of L. donovani amastigotes. Glucose Regulated Protein (GRP78), a member of the 70 kDa heat-shock protein family was identified and characterised. The GRP78 gene was localised to chromosome 15 in L. donovani, L. major, and L. mexicana by pulse-field gel electrophoresis. The Leishmania GRP78 protein contain a carboxy-terminal endoplasmic reticulum retention signal sequence (MDDL) as does the Trypanosoma cruzi GRP78. Immunofluorescence using antibodies to the recombinant DNA-derived GRP78 protein showed staining localised to reticular material throughout the cytoplasm and in the perinuclear region of promastigotes, suggesting that the protein is localised in the endoplasmic reticulum. The protective efficacy of GRP78 was assessed in mice vaccine experiments. A GRP78 DNA vaccine primed for an immune response that protected C57B1/6 and C3H/Hc mice against infection with L. major. Similarly vaccination with a recombinant form of GRP78 purified from Escherichia coli and administered with Freund's as adjuvant induced protective immunity in C57B1/6 mice. (C) 2001 Elsevier Science B.V. All rights reserved.
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