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. 2003 Aug 15;374(Pt 1):193–198. doi: 10.1042/BJ20030622

Definition of structural elements in Plasmodium vivax and P. knowlesi Duffy-binding domains necessary for erythrocyte invasion.

Saurabh K Singh 1, Agam P Singh 1, Sunita Pandey 1, Syed S Yazdani 1, Chetan E Chitnis 1, Amit Sharma 1
PMCID: PMC1223586  PMID: 12775212

Abstract

Plasmodium vivax and P. knowlesi use the Duffy antigen as a receptor to invade human erythrocytes. Duffy-binding ligands belong to a family of erythrocyte-binding proteins that bind erythrocyte receptors to mediate invasion. Receptor-binding domains in erythrocyte-binding proteins lie in conserved cysteine-rich regions called Duffy-binding-like domains. In the present study, we report an analysis of the overall three-dimensional architecture of P. vivax and P. knowlesi Duffy-binding domains based on mild proteolysis and supportive-functional assays. Our proteolysis experiments indicate that these domains are built of two distinct subdomains. The N-terminal region from Cys-1-4 (C1-C4) forms a stable non-functional subdomain. The region spanning C5-C12 forms another subdomain, which is capable of binding Duffy antigen. These subdomains are joined by a protease-sensitive linker. Results from deletion constructs, designed for expression of truncated proteins on COS cell surface, show that regions containing C5-C8 of the Duffy-binding domains are sufficient for the binding receptor. Therefore the central region of Duffy-binding domains, which is flanked by two non-functional regions, is responsible for receptor recognition. Moreover, the minimal Duffy-binding region identified here is capable of folding into a functionally competent module. These studies pave the way for understanding the architecture of Duffy-binding domains and their interactions with host receptors.

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Selected References

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