The S-antigen of Plasmodium falciparum: repertoire and origin of diversity

Quentin Bickle, Robin F. Anders, Karen Day, Ross L. Coppel

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4 Citations (Scopus)


S-antigens are heat-stable, highly polymorphic proteins released by Plasmodium falciparum at the time of schizont rupture. Previously determined S-antigen sequences allowed the proposal of a general gene structure consisting of 5 sequence blocks. The sequence of the central block of tandem repeats provides a useful means of distinguishing the S-antigen allele and also its serotype, whereas the amino and carboxy terminal sequences defined the S-antigen family, 4 of which have been described. We present the sequence of 3 new S-antigen alleles, for the isolates HB3, KF 1916 and KF 1917. The allele-defining repeat sequence is ETGPGKAGEQG for H B3, GDQTEGS(S/A)GGK for KF1917 and AGSNE(E/K) for KF 1916. The sequences of these newly described S-antigens are consistent with the proposed general gene structure and all belong to defined families, although carboxy-terminal sequences appear to be much more variable within a family than previously realised.

Original languageEnglish
Pages (from-to)189-196
Number of pages8
JournalMolecular and Biochemical Parasitology
Issue number2
Publication statusPublished - 1 Jan 1993
Externally publishedYes


  • Antigenic diversity
  • Plasmodium falciparum
  • Repeat
  • S-antigen
  • Serotyping

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