Project description:To investigate the DNA-binding property of two tandem AP2 domains of PbSIP2, DNA immunoprecipitation followed by high-throughput sequencing (DIP-seq) analysis were performed. Recombinant AP2 domains fused with maltose-binding protein (MBP) were mixed with the P. berghei genomic DNA fragmented via sonication, and protein-DNA complex was harvested using amylose resin. The obtained DNA fragments were sequenced via the next generation sequencing.
Project description:Plasmodium berghei transcriptomes of pbsip2cKO, a parasite line in which pbsip2 is disrupted by DiCre-mediated recombination in the presence of rapamycin, were analyzed at the schizont stage.
Project description:To investigate the genome-wide binding sites of PbSIP2 in Plasmodium berghei, the chromatin immunoprecipitation followed by high-throughput sequencing (ChIP-seq) analyses were performed. Parasites expressing GFP-fused PbSIP2 (PbSIP2::GFP) in cultures were harvested at 24 h post infection and subjected to ChIP-seq experiments using anti-GFP antibody. Binding sites of PbSIP2 were determined from the sequence data.
Project description:Plasmodium falciparum malaria severely impacts human health. In order to broaden our understanding of merozoite invasion of erythrocytes which is responsible for clinical disease, a P. falciparum γ-irradiated "long-lived merozoite" (LLM) line was investigated. Cell-sieve purified LLM invaded human erythrocytes with an improved efficiency of 10- to 300-fold greater than wild-type (WT) parasites. A comparison of their genomes identified limited changes in the open reading frame of LLM; while only marginal differences were observed in the transcriptomes. Analysis of their proteomes by quantitative mass-spectrometry identified 446 out of 981 proteins of known or unknown function with a significant change in protein abundance (ANOVA p < 0.05). Furthermore, the relative molar concentration of nearly 1100 merozoite proteins was established. Unfortunately, a specific change being responsible for the LLM phenotype was not identified. However, immunoblot analyses of LLM lysates showed proteolytic processing of some proteins of the MSP1 complex and AMA1 were delayed, suggesting that this delayed proteolysis positively impacted merozoite viability and subsequent invasion.
Project description:To reconstruct the 3D genomes of single diploid human and mouse cells, we performed single-cell chromatin conformation capture by a novel method, Dip-C, on human cells, and re-analyzed published data on mouse cells by the Dip-C algorithm.
Project description:Malaria-causing parasites of the Plasmodium genus undergo multiple developmental phases in the human and the mosquito hosts regulated by various post-translational modifications. While ubiquitination by multi-component E3 ligases is key to regulate a wide range of cellular processes in eukaryotes, little is known about its role in Plasmodium. Here we show that Plasmodium berghei expresses a conserved SKP1/Cullin1/FBXO1 complex showing tightly regulated expression and localisation across multiple developmental stages. It regulates cell division by controlling nucleus segregation during schizogony and centrosome partitioning during microgametogenesis. It additionally controls parasite-specific processes including gamete egress from the host erythrocyte, as well as formation of the merozoite apical complex and the ookinete inner membrane complex (IMC), two structures essential for Plasmodium dissemination, moreover it is critical for zygote to ookinete conversation. Ubiquitinomic surveys reveal a large set of proteins ubiquitinated in an FBXO1-dependent manner including proteins important for egress and IMC organisation. We additionally demonstrate bidirectional interplay between ubiquitination and phosphorylation via calcium-dependent protein kinase 1. Altogether we show that Plasmodium SCFFBXO1 plays conserved roles in cell division and additionally controls parasite-specific processes in the mammalian and mosquito hosts.
Project description:Malaria-causing parasites of the Plasmodium genus undergo multiple developmental phases in the human and the mosquito hosts regulated by various post-translational modifications. While ubiquitination by multi-component E3 ligases is key to regulate a wide range of cellular processes in eukaryotes, little is known about its role in Plasmodium. Here we show that Plasmodium berghei expresses a conserved SKP1/Cullin1/FBXO1 complex showing tightly regulated expression and localisation across multiple developmental stages. It regulates cell division by controlling nucleus segregation during schizogony and centrosome partitioning during microgametogenesis. It additionally controls parasite-specific processes including gamete egress from the host erythrocyte, as well as formation of the merozoite apical complex and the ookinete inner membrane complex (IMC), two structures essential for Plasmodium dissemination, moreover it is critical for zygote to ookinete conversation. Ubiquitinomic surveys reveal a large set of proteins ubiquitinated in an FBXO1-dependent manner including proteins important for egress and IMC organisation. We additionally demonstrate bidirectional interplay between ubiquitination and phosphorylation via calcium-dependent protein kinase 1. Altogether we show that Plasmodium SCFFBXO1 plays conserved roles in cell division and additionally controls parasite-specific processes in the mammalian and mosquito hosts.
Project description:Malaria-causing parasites of the Plasmodium genus undergo multiple developmental phases in the human and the mosquito hosts regulated by various post-translational modifications. While ubiquitination by multi-component E3 ligases is key to regulate a wide range of cellular processes in eukaryotes, little is known about its role in Plasmodium. Here we show that Plasmodium berghei expresses a conserved SKP1/Cullin1/FBXO1 complex showing tightly regulated expression and localisation across multiple developmental stages. It regulates cell division by controlling nucleus segregation during schizogony and centrosome partitioning during microgametogenesis. It additionally controls parasite-specific processes including gamete egress from the host erythrocyte, as well as formation of the merozoite apical complex and the ookinete inner membrane complex (IMC), two structures essential for Plasmodium dissemination, moreover it is critical for zygote to ookinete conversation. Ubiquitinomic surveys reveal a large set of proteins ubiquitinated in an FBXO1-dependent manner including proteins important for egress and IMC organisation. We additionally demonstrate bidirectional interplay between ubiquitination and phosphorylation via calcium-dependent protein kinase 1. Altogether we show that Plasmodium SCFFBXO1 plays conserved roles in cell division and additionally controls parasite-specific processes in the mammalian and mosquito hosts.