The Plasmodium serine-type SERA proteases display distinct expression patterns and non-essential in vivo roles during life cycle progression of the malaria parasite

Putrianti, Elyzana D; Schmidt-Christensen, Anja; Arnold, Iris; Heussler, Volker; Matuschewski, Kai; Silvie, Olivier (2010). The Plasmodium serine-type SERA proteases display distinct expression patterns and non-essential in vivo roles during life cycle progression of the malaria parasite. Cellular microbiology, 12(6), pp. 725-739. Blackwell 10.1111/j.1462-5822.2009.01419.x

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Parasite proteases play key roles in several fundamental steps of the Plasmodium life cycle, including haemoglobin degradation, host cell invasion and parasite egress. Plasmodium exit from infected host cells appears to be mediated by a class of papain-like cysteine proteases called 'serine repeat antigens' (SERAs). A SERA subfamily, represented by Plasmodium falciparum SERA5, contains an atypical active site serine residue instead of a catalytic cysteine. Members of this SERAser subfamily are abundantly expressed in asexual blood stages, rendering them attractive drug and vaccine targets. In this study, we show by antibody localization and in vivo fluorescent tagging with the red fluorescent protein mCherry that the two P. berghei serine-type family members, PbSERA1 and PbSERA2, display differential expression towards the final stages of merozoite formation. Via targeted gene replacement, we generated single and double gene knockouts of the P. berghei SERAser genes. These loss-of-function lines progressed normally through the parasite life cycle, suggesting a specialized, non-vital role for serine-type SERAs in vivo. Parasites lacking PbSERAser showed increased expression of the cysteine-type PbSERA3. Compensatory mechanisms between distinct SERA subfamilies may thus explain the absence of phenotypical defect in SERAser disruptants, and challenge the suitability to develop potent antimalarial drugs based on specific inhibitors of Plasmodium serine-type SERAs.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Cell Biology > Malaria
08 Faculty of Science > Department of Biology > Institute of Cell Biology

UniBE Contributor:

Heussler, Volker

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

1462-5814

Publisher:

Blackwell

Language:

English

Submitter:

Volker Heussler

Date Deposited:

12 Jul 2016 08:34

Last Modified:

13 Jul 2016 04:24

Publisher DOI:

10.1111/j.1462-5822.2009.01419.x

PubMed ID:

20039882

BORIS DOI:

10.7892/boris.84088

URI:

https://boris.unibe.ch/id/eprint/84088

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