Molecular and functional characterisation of the heat shock protein 10 of Strongyloides ratti.

Abstract:

:Strongyloides stercoralis and S. ratti are intestinal parasitic nematodes infecting rats and humans, respectively. Both present extraordinary life cycles comprising a free-living generation in addition to parasitic stages. In search of molecules possibly involved in parasite-host interaction, we performed mass spectrometry to identify excretory/secretory products of S. ratti. Amongst others we detected homologs of the heat shock proteins HSP10 and HSP60 (Sr-HSP10 and Sr-HSP60). HSPs are well known as chaperones involved in stress responses of cells, but recent studies suggest additional roles of small HSPs for parasite biology including immune modulation. To characterise Sr-HSP10, we cloned its full-length cDNA, analysed the genomic organisation, tested its presumptive role as an interaction partner of Sr-HSP60, studied its transcription in the parasite, and expressed the protein to test its immune responses. The cDNA contains an open reading frame of 330bp encoding a polypeptide of 110 amino acids with an approximate molecular weight of 10kDa. The Sr-HSP10 protein is highly homologous to that of the human pathogen S. stercoralis with only eight amino acid substitutions. Analysis of the genomic organisation of the Sr-HSP10 locus revealed that the gene is linked head-to-head to the gene encoding Sr-HSP60, and both share a bidirectional promoter. RT-PCR experiments indicated potential independent expression of the Sr-HSPs genes. In situ hybridisation results demonstrate Sr-HSP10 transcription in the gut area. Mammalian and yeast two-hybrid assays show dimerisation of Sr-HSP10, but no binding to recombinant Sr-HSP60. Immunisation experiments finally revealed a strong immunogenicity of Sr-HSP10 and provided evidence for a role in regulating the host-parasite interaction.

journal_name

Mol Biochem Parasitol

authors

Tazir Y,Steisslinger V,Soblik H,Younis AE,Beckmann S,Grevelding CG,Steen H,Brattig NW,Erttmann KD

doi

10.1016/j.molbiopara.2009.07.007

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

149-57

issue

2

eissn

0166-6851

issn

1872-9428

pii

S0166-6851(09)00191-1

journal_volume

168

pub_type

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