Dataset Information

Co-option of Plasmodium falciparum PP1 for egress from host erythrocytes

ABSTRACT: Asexual proliferation of the Plasmodium parasites that cause malaria follow a developmental program that alternates non-canonical intraerythrocytic replication with dissemination to new host cells. We carried out a functional analysis of the Plasmodium falciparum homolog of Protein Phosphatase 1 (PfPP1), a universally conserved cell cycle factor in eukaryotes, to investigate regulation of parasite proliferation. PfPP1 is indeed required for efficient replication, but is absolutely essential for egress of parasites from host red blood cells. By phosphoproteomic and chemical-genetic analysis, we isolate two functional targets of PfPP1 for egress: a HECT E3 protein-ubiquitin ligase; and GCalpha, a fusion protein composed of a guanylyl cyclase and a phospholipid transporter domain. We hypothesize that PfPP1 regulates lipid sensing by GCalpha and demonstrate that phosphatidylcholine stimulates PfPP1-dependent egress. PfPP1 acts as a key regulator that integrates multiple cell-intrinsic pathways with external signals to direct parasite egress from host cells.

INSTRUMENT(S): Orbitrap Fusion

ORGANISM(S): Plasmodium Falciparum Dd2

SUBMITTER: Joao Paulo

LAB HEAD: Joao A. Paulo

PROVIDER: PXD018718 | Pride | 2020-08-11

REPOSITORIES: pride

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			Action	DRS
	203727_m07560_PlasPro.mzIdentML	Mzid
	203728_m07561_PlasPro.mzIdentML	Mzid
	203729_m07562_PlasPro.mzIdentML	Mzid
	203730_m07563_PlasPro.mzIdentML	Mzid
	203731_m07564_PlasPro.mzIdentML	Mzid

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Co-option of Plasmodium falciparum PP1 for egress from host erythrocytes.

Paul Aditya S AS Miliu Alexandra A Paulo Joao A JA Goldberg Jonathan M JM Bonilla Arianna M AM Berry Laurence L Seveno Marie M Braun-Breton Catherine C Kosber Aziz L AL Elsworth Brendan B Arriola Jose S N JSN Lebrun Maryse M Gygi Steven P SP Lamarque Mauld H MH Duraisingh Manoj T MT

Nature communications 20200715 1

Asexual proliferation of the Plasmodium parasites that cause malaria follows a developmental program that alternates non-canonical intraerythrocytic replication with dissemination to new host cells. We carried out a functional analysis of the Plasmodium falciparum homolog of Protein Phosphatase 1 (PfPP1), a universally conserved cell cycle factor in eukaryotes, to investigate regulation of parasite proliferation. PfPP1 is indeed required for efficient replication, but is absolutely essential for ...[more]

PMID: 32669539

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Project description:Quantitative studies of the P. falciparum transcriptome have shown that the tightly controlled progression of the parasite through the intraerythrocytic developmental cycle (IDC) is accompanied by a continuous gene expression cascade where most expressed genes exhibit a single transcriptional peak. Since proteins represent the decisive business end of gene expression, understanding the correlation between mRNA and protein levels is crucial for inferring biological activity from transcriptional gene expression data. While pertinent studies on other organisms show that as little as 20-40% of protein abundance variation may be attributable to corresponding mRNA levels, the situation in Plasmodium is further complicated by the dynamic nature of the cyclic gene expression cascade where the mRNA levels of most genes change constantly during the IDC. In this study, we simultaneously determined mRNA and protein abundance profiles for P. falciparum parasites during the IDC at 2-hour resolution based on spotted oligonucleotide microarrays and 2D-protein gels in combination with DIGE fluorescent dyes. Intriguingly, most proteins are represented by more than one isoform, presumably due to post-translational modifications. Analysis of 366 protein abundance profiles and the corresponding mRNA levels shows that in 67.2% of cases the protein abundance peaks at least 8 hours after the mRNA level peak. While it may be tempting to interpret this as evidence for widespread post-transcriptional gene regulation additional analyses including computer modeling demonstrate that in >60% of these cases the observed protein profiles including the peak lag times could arise as a consequence of the corresponding mRNA levels when simple translation and degradation dynamics are assumed. We further characterize and illustrate these dynamics and show that even human host proteins within the parasite may be subject to similar dynamics as their parasite counterparts. 24 timepoint samples were harvested from a tightly synchronous 6.5 liter biofermenter culture of P. falciparum (Dd2) at 2-hour intervals during one entire intraerythrocytic developmental cycle and compared against a 3D7 RNA reference pool.