A cloned gene of Cryptosporidium parvum encodes neutralization-sensitive epitopes

Lance E. Perryman, Douglas P. Jasmer, Michael W Riggs, Stewart G. Bohnet, Travis C. McGuire, Michael J. Arrowood

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

Two mAb, C6B6 and 7D10, each significantly reduced infection of mice by Cryptosporidium parvum and reacted with a 23-kDa glycoprotein (p23) of geographically disperse C. parvum isolates. The antibodies were used to identify plaques in a cDNA library prepared from C. parvum sporozoite mRNA. cDNA insert sequences from positive plaques were determined and used to isolate additional clones encoding p23 coding sequences. A consensus open reading frame of 333 base pairs, encoding 111 amino acids, was identified in this collection of cDNAs. The predicted amino acid sequence contained one N-glycosylation site, but lacked hydrophobic membrane spanning regions. Epitope mapping revealed that mAb 7D10 defines the linear epitope QDKPAD which occurs twice in the C terminal region of the peptide encoded by the ORF. This same C terminal peptide region contains a non-linear epitope bound by mAb C6B6. Serum from mice immunized with synthetic C terminal peptide reacted with sporozoite p23. The occurrence of neutralization-sensitive epitopes encoded by defined regions of the C. parvum genome suggests that recombinant proteins or synthetic peptides containing these epitopes may prove useful for inducing immune responses that diminish infection.

Original languageEnglish (US)
Pages (from-to)137-147
Number of pages11
JournalMolecular and Biochemical Parasitology
Volume80
Issue number2
DOIs
StatePublished - Oct 1 1996

Fingerprint

Cryptosporidium parvum
Epitopes
Sporozoites
Peptides
Open Reading Frames
Genes
Complementary DNA
Epitope Mapping
Infection
Gene Library
Glycosylation
Recombinant Proteins
Base Pairing
Amino Acid Sequence
Glycoproteins
Clone Cells
Genome
Amino Acids
Messenger RNA
Membranes

Keywords

  • Cryptosporidium parvum
  • Epitope
  • Genes
  • Infectious immunity
  • Mouse

ASJC Scopus subject areas

  • Molecular Biology
  • Parasitology

Cite this

A cloned gene of Cryptosporidium parvum encodes neutralization-sensitive epitopes. / Perryman, Lance E.; Jasmer, Douglas P.; Riggs, Michael W; Bohnet, Stewart G.; McGuire, Travis C.; Arrowood, Michael J.

In: Molecular and Biochemical Parasitology, Vol. 80, No. 2, 01.10.1996, p. 137-147.

Research output: Contribution to journalArticle

Perryman, Lance E. ; Jasmer, Douglas P. ; Riggs, Michael W ; Bohnet, Stewart G. ; McGuire, Travis C. ; Arrowood, Michael J. / A cloned gene of Cryptosporidium parvum encodes neutralization-sensitive epitopes. In: Molecular and Biochemical Parasitology. 1996 ; Vol. 80, No. 2. pp. 137-147.
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