Mechanoregulation of basal body integrity during Plasmodium exflagellation

Area of Science:

• Cell Biology
• Parasitology
• Structural Biology

Background:

• Constant mechanical stress challenges cellular structural integrity.
• Plasmodium male gametogenesis involves unique axoneme release, exposing the basal body to mechanical stress during exflagellation.
• The mechanism by which Plasmodium maintains basal body integrity under such stress is unknown.

Purpose of the Study:

• To identify factors involved in maintaining basal body structural integrity during Plasmodium male gametogenesis.
• To elucidate the mechanism of mechanical stress adaptation in Plasmodium.

Main Methods:

• Identification and characterization of conserved Plasmodium proteins.
• Analysis of parasite mutants lacking specific proteins.
• In vivo and in vitro assays to assess protein function under mechanical stress.
• Microscopy to visualize protein localization and structural integrity.

Main Results:

• A conserved protein, Calcifer, was identified as essential for male gamete formation and mosquito transmission.
• Calcifer localizes to the basal body during exflagellation and stabilizes it against mechanical forces.
• Parasites lacking Calcifer exhibit axoneme disintegration during exflagellation, a phenotype rescued by inhibiting axoneme beating.
• Calcifer forms a protective wrapping structure around the basal body.

Conclusions:

• Calcifer is a key factor safeguarding basal body integrity during Plasmodium axoneme exflagellation.
• Calcifer provides a mechanical stabilization mechanism against axoneme-beating-induced stress.
• This discovery offers insights into parasite transmission and potential therapeutic targets.