PXD034193

PXD034193 is an original dataset announced via ProteomeXchange.

Title	Protein composition of Toxoplasma endocytic and exocytic structures by proximity-dependent biotinylation
Description	Toxoplasma gondii is a widely prevalent parasite of animals and humans that causes a broad spectrum of conditions ranging from asymptomatic or mild cold-like infections to abortion, severe ocular disease, encephalitis, and sometimes death. It is a member of the phylum Apicomplexa that also includes such significant human pathogens as Plasmodium spp. and Cryptosporidium spp. causing malaria and diarrheal disease, respectively. The toxoplasma cell has a multilayered pellicle: under the plasma membrane lies the inner membrane complex (IMC) comprised of flat membrane sacks supported by cortical microtubules and a meshwork of cytoskeletal filaments. The IMC acts as a mechanical barrier for membrane vesicles trafficking to and from the plasma membrane, necessitating the existence of dedicated cites for endo- and exocytosis where the IMC is interrupted. One such site is located at the apical end of the cell where the contents of the apical secretory organelles is exocytosed upon invasion. However, endocytosis in Toxoplasma and other apicomplexans is poorly understood, although conspicuous invaginations of the plasma membrane observed microscopically have been dubbed the micropore and postulated to be involved in endocytosis. We found that the endocytic markers including the subunits α and μ of the AP2 adaptor complex, dynamin-related protein C (DrpC), an Eps15 homology domain-containing protein, and the kelch-domain protein K13 localise to distinct persistent foci in the pellicle of Toxoplasma. Another type of persistent punctate structures found in the IMC are the enigmatic apical annuli whose function is completely unknown. We have discovered a new component of the annuli which is a putative LMBR1 family region protein embedded into the plasma membrane. Our experiments indicate that this protein – and annuli by extension – has a role in exocytosis. To better understand the molecular composition of these endocytic and exocytic structures and gain an insight into their function, we genetically fused them with a promiscuous bacterial biotin-ligase BirA* and used them as baits in proximity-dependent biotin identification experiments (BioID). We employed TMT10plex labelling and MS3-level tandem mass spectrometry with synchronous precursor selection (SPS-MS3) to achieve accurate quantification of multiple samples. Several hundred proteins have been identified and quantified in three biological replicates for every bait and the parental cell line control. Proteins significantly enriched in the BirA*-tagged cells relative to the control have been identified using linear modelling with LIMMA.
HostingRepository	PRIDE
AnnounceDate	2023-11-14
AnnouncementXML	Submission_2023-11-14_08:56:14.835.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Konstantin Barylyuk
SpeciesList	scientific name: Toxoplasma gondii RH; NCBI TaxID: 383379; scientific name: Bos taurus (Bovine); NCBI TaxID: 9913; scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	TMT6plex-126 reporter+balance reagent acylated residue; biotinylated residue; monohydroxylated residue; deamidated residue; iodoacetamide derivatized residue
Instrument	Orbitrap Fusion Lumos

Revision	Datetime	Status	ChangeLog Entry
0	2022-05-29 14:11:23	ID requested
1	2023-04-17 02:27:28	announced
⏵ 2	2023-11-14 08:56:15	announced	2023-11-14: Updated project metadata.

Dataset with its publication pending

submitter keyword: K13, SPS-MS3, BioID, endocytosis, membrane, inner membrane complex, exocytosis,Toxoplasma gondii, TMT, Apicomplexa, protist, apical annuli, protozoa, pellicle

Ross F. Waller
contact affiliation	Department of Biochemistry, University of Cambridge, UK
contact email	rfw26@cam.ac.uk
lab head
Konstantin Barylyuk
contact affiliation	Department of Biochemistry, University of Cambridge
contact email	kb601@cam.ac.uk
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD034193
     1. Label: PRIDE project
     2. Name: Protein composition of Toxoplasma endocytic and exocytic structures by proximity-dependent biotinylation