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Knobs, knob proteins and cytoadherence in falciparum malaria.

Y D Sharma1

  • 1Department of Biotechnology, All India Institute of Medical Sciences, New Delhi.

The International Journal of Biochemistry
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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Knobs on infected red blood cells mediate cytoadherence, causing severe falciparum malaria. Understanding knob proteins and their interactions is crucial for developing new malaria treatments and vaccines.

Area of Science:

  • Parasitology
  • Molecular Biology
  • Immunology

Background:

  • Sequestration of infected erythrocytes (IRBC) in internal organs causes severe falciparum malaria morbidity and mortality.
  • This cytoadherence is mediated by parasite-induced 'knobs' on the IRBC surface, acting as junctions with host endothelial cells.
  • Knobless parasites do not cause virulent infections, highlighting the critical role of knobs in malaria pathophysiology.

Purpose of the Study:

  • To explore the role of knobs in falciparum malaria pathophysiology.
  • To identify and characterize knob proteins and their interactions with host endothelial receptors.
  • To evaluate knob antigens as potential targets for immunotherapy and vaccine development.

Main Methods:

  • Identification and classification of knob proteins (e.g., KAHRP, PFEMP-1, PFEMP-2/MESA/PP-300).

Related Experiment Videos

  • Molecular-level studies on KAHRP and MESA/PFEMP-2, including chromosomal localization.
  • Identification and partial characterization of endothelial receptor molecules for knob ligands.

    • Main Results:

    • Several knob proteins have been identified, classified by function (knob-inducing, cytoadherent, structural).
    • KAHRP is located on chromosome 2, and MESA/PFEMP-2 on chromosomes 5 and 6.
    • Endothelial receptor molecules for knob ligands have been identified and partially characterized.

    Conclusions:

    • Knobs are critical for falciparum malaria virulence through cytoadherence.
    • Knob proteins and their host receptors are potential targets for immunotherapeutic reagents.
    • Further research on knob protein structure, function, interactions, and expression is needed for developing malaria treatments and vaccines.