Unknown

Dataset Information

0

Identification of a nuclear localization signal in the Plasmodium falciparum CTP: phosphocholine cytidylyltransferase enzyme.


ABSTRACT: The phospholipid biosynthesis of the malaria parasite, Plasmodium falciparum is a key process for its survival and its inhibition is a validated antimalarial therapeutic approach. The second and rate-limiting step of the de novo phosphatidylcholine biosynthesis is catalysed by CTP: phosphocholine cytidylyltransferase (PfCCT), which has a key regulatory function within the pathway. Here, we investigate the functional impact of the key structural differences and their respective role in the structurally unique pseudo-heterodimer PfCCT protein in a heterologous cellular context using the thermosensitive CCT-mutant CHO-MT58 cell line. We found that a Plasmodium-specific lysine-rich insertion within the catalytic domain of PfCCT acts as a nuclear localization signal and its deletion decreases the nuclear propensity of the protein in the model cell line. We further showed that the putative membrane-binding domain also affected the nuclear localization of the protein. Moreover, activation of phosphatidylcholine biosynthesis by phospholipase C treatment induces the partial nuclear-to-cytoplasmic translocation of PfCCT. We additionally investigated the cellular function of several PfCCT truncated constructs in a CHO-MT58 based rescue assay. In absence of the endogenous CCT activity we observed that truncated constructs lacking the lysine-rich insertion, or the membrane-binding domain provided similar cell survival ratio as the full length PfCCT protein.

SUBMITTER: Izrael R 

PROVIDER: S-EPMC7665022 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

altmetric image

Publications

Identification of a nuclear localization signal in the Plasmodium falciparum CTP: phosphocholine cytidylyltransferase enzyme.

Izrael Richard R   Marton Lívia L   Nagy Gergely N GN   Pálinkás Hajnalka L HL   Kucsma Nóra N   Vértessy Beáta G BG  

Scientific reports 20201112 1


The phospholipid biosynthesis of the malaria parasite, Plasmodium falciparum is a key process for its survival and its inhibition is a validated antimalarial therapeutic approach. The second and rate-limiting step of the de novo phosphatidylcholine biosynthesis is catalysed by CTP: phosphocholine cytidylyltransferase (PfCCT), which has a key regulatory function within the pathway. Here, we investigate the functional impact of the key structural differences and their respective role in the struct  ...[more]

Similar Datasets

| S-EPMC6378109 | biostudies-literature
| S-EPMC1218507 | biostudies-other
| S-EPMC4571330 | biostudies-literature
| S-EPMC5997628 | biostudies-literature
| S-EPMC1133833 | biostudies-literature
| S-EPMC2787997 | biostudies-literature
| S-EPMC1223718 | biostudies-other
| S-EPMC2652266 | biostudies-literature
| S-EPMC3894351 | biostudies-literature
| S-EPMC1218525 | biostudies-other