The immunodominant 17-kDa antigen from Cryptosporidium parvum is glycosylphosphatidylinositol-anchored.

Abstract:

:Cryptosporidium parvum is a protozoan parasite of the intestinal epithelium that has caused numerous outbreaks of diarrheal illness in humans. During our studies of the host immune response to C. parvum infection, we noted that two of the immunodominant surface antigens of the sporozoite stage of the parasite readily extract into Triton X-114. We recently cloned the immunodominant 17-kDa surface antigen and suggested that the carboxy-terminal peptide sequence may satisfy the requirements for GPI anchor addition. In the work presented here, we were able to show that the 17-kDa antigen could be metabolically labeled in vitro with tritiated ethanolamine and that the antigen contained myo-inositol. The antigen was cleaved by GPI-PLD but not by PI-PLC and it could be converted to a water soluble form by chemical deglycosylation. We suggest that the 17-kDa antigen is indeed GPI anchored and that the anchor contains an acylated inositol and either a lyso-acyl- or a diacyl-glycerol. We are currently working to determine what role the anchor may play in the human immune response to this antigen.

journal_name

Mol Biochem Parasitol

authors

Priest JW,Xie LT,Arrowood MJ,Lammie PJ

doi

10.1016/s0166-6851(00)00386-8

subject

Has Abstract

pub_date

2001-03-01 00:00:00

pages

117-26

issue

1

eissn

0166-6851

issn

1872-9428

pii

S0166685100003868

journal_volume

113

pub_type

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