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J. Biol. Chem., Vol. 277, Issue 49, 47524-47532, December 6, 2002
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From the Walter and Eliza Hall Institute of Medical Research,
Melbourne, Victoria 3050, Australia
The Plasmodium
falciparum serine repeat antigen (SERA) has shown considerable
promise as a blood stage vaccine for the control of malaria. A related
protein, SERPH, has also been described in P. falciparum.
Whereas their biological role remains unknown, both proteins possess
papain-like protease domains that may provide attractive targets for
therapeutic intervention. Genomic sequencing has recently shown that
SERA and SERPH are the fifth and sixth genes,
respectively, in a cluster of eight SERA homologues present on chromosome 2. In this paper, the expression and functional relevance
of these eight genes and of a ninth SERA homologue found on
chromosome 9 were examined in blood stage parasites. Using reverse
transcriptase-PCR and microarray approaches, we demonstrate that
whereas mRNA to all nine SERA genes is synthesized late
in the erythrocytic cycle, it is those genes in the central
region of the chromosome 2 cluster that are substantially up-regulated at this time. Using antibodies specific to each SERA, it was apparent that SERA4 to -6, and possibly also SERA9, are synthesized in blood
stage parasites. The reactivity of antibodies from malaria-immune individuals with the SERA recombinant proteins suggested that SERA2 and
SERA3 are also expressed at least in some parasite populations. To
examine whether SERA genes are essential to blood stage
growth, each of the eight chromosome 2 SERA genes was
targeted for disruption. Whereas genes at the periphery of the cluster
were mostly dispensable (SERA2 and -3 and
SERA7 and -8), those in the central region
(SERA4 to -6) could not be disrupted. The
inability to disrupt SERA4, -5, and
-6 is consistent with their apparent dominant expression and implies an important role for these genes in maintenance of the
erythrocytic cycle.
A Subset of Plasmodium falciparum SERA Genes Are
Expressed and Appear to Play an Important Role in the Erythrocytic
Cycle*
,
,
*
This work was supported by the National Health and Medical
Research Council of Australia and by the UNDP/World Bank/WHO Special Program for Research and Training in Tropical Diseases.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Recipient of a Melbourne Research Scholarship (University of Melbourne).
§
Recipient of an NHMRC Peter Doherty postdoctoral award.
¶
Recipient of an Australian Postgraduate Research Award.
International Research Scholar of the Howard Hughes Medical Institute.
**
Recipient of an NHMRC Howard Florey postdoctoral award.

International Research Scholar of the Howard Hughes Medical
Institute. To whom all correspondence should be addressed: The Walter
and Eliza Hall Institute of Medical Research, PO Royal Melbourne
Hospital, VIC 3050, Australia. Tel.: 61-3-9345-2555; Fax:
61-3-9347-0852; E-mail: crabb@wehi.edu.au.
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