期刊
MOLECULAR MICROBIOLOGY
卷 67, 期 1, 页码 78-87出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-2958.2007.06019.x
关键词
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资金
- NIAID NIH HHS [R01 AI047953-07A1, T32 AI007509] Funding Source: Medline
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R01AI047953, T32AI007509] Funding Source: NIH RePORTER
The Duffy binding-like (DBL) domain is a key adhesive module in Plasmodium falciparum, present in both erythrocyte invasion ligands (EBLs) and the large and diverse P. falciparum erythrocyte membrane protein 1 (PfEMP1) family of cytoadherence receptors. DBL domains bind a variety of different host receptors, including intercellular adhesion molecule 1 (ICAM-1), a receptor interaction that may have a role in infected erythrocyte binding to cerebral blood vessels and cerebral malaria. In this study, we expressed the nearly full complement of DBL beta-C2 domains from the IT4/25/5 (IT4) parasite isolate and showed that ICAM-1-binding domains (DBL beta-C2(ICAM-1)) were confined to group B and group C PfEMP1 proteins and were not present in group A, suggesting that ICAM-1 selection pressure differs between PfEMP1 groups. To further dissect the molecular determinants of binding, we modelled a DBL beta-C2(ICAM-1) domain on a solved DBL structure and created alanine substitution mutants in two DBL beta-C2(ICAM-1) domains. This analysis indicates that the DBL beta-C2::ICAM-1 interaction maps to the equivalent glycan binding region of EBLs, and suggests a general model for how DBL domains evolve under dual selection for host receptor binding and immune evasion.
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