An Sfi1-like centrin-interacting centriolar plaque protein affects nuclear microtubule homeostasis.

Autor: Christoph Wenz, Caroline Sophie Simon, Tatiany Patricia Romão, Vanessa Saskia Stürmer, Marta Machado, Natacha Klages, Anja Klemmer, Yannik Voß, Markus Ganter, Mathieu Brochet, Julien Guizetti
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: PLoS Pathogens, Vol 19, Iss 5, p e1011325 (2023)
Druh dokumentu: article
ISSN: 1553-7366
1553-7374
DOI: 10.1371/journal.ppat.1011325
Popis: Malaria-causing parasites achieve rapid proliferation in human blood through multiple rounds of asynchronous nuclear division followed by daughter cell formation. Nuclear divisions critically depend on the centriolar plaque, which organizes intranuclear spindle microtubules. The centriolar plaque consists of an extranuclear compartment, which is connected via a nuclear pore-like structure to a chromatin-free intranuclear compartment. Composition and function of this non-canonical centrosome remain largely elusive. Centrins, which reside in the extranuclear part, are among the very few centrosomal proteins conserved in Plasmodium falciparum. Here we identify a novel centrin-interacting centriolar plaque protein. Conditional knock down of this Sfi1-like protein (PfSlp) caused a growth delay in blood stages, which correlated with a reduced number of daughter cells. Surprisingly, intranuclear tubulin abundance was significantly increased, which raises the hypothesis that the centriolar plaque might be implicated in regulating tubulin levels. Disruption of tubulin homeostasis caused excess microtubules and aberrant mitotic spindles. Time-lapse microscopy revealed that this prevented or delayed mitotic spindle extension but did not significantly interfere with DNA replication. Our study thereby identifies a novel extranuclear centriolar plaque factor and establishes a functional link to the intranuclear compartment of this divergent eukaryotic centrosome.
Databáze: Directory of Open Access Journals
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