Nutrient availability regulates proline/alanine transporters in Trypanosoma brucei.
Trypanosoma brucei
amino acid
amino acid transport
cell metabolism
energy metabolism
gene expression
parasite metabolism
transcriptomics
transporter
Journal
The Journal of biological chemistry
ISSN: 1083-351X
Titre abrégé: J Biol Chem
Pays: United States
ID NLM: 2985121R
Informations de publication
Date de publication:
Historique:
received:
25
09
2020
revised:
09
03
2021
accepted:
17
03
2021
pubmed:
23
3
2021
medline:
19
8
2021
entrez:
22
3
2021
Statut:
ppublish
Résumé
Trypanosoma brucei is a species of unicellular parasite that can cause severe diseases in livestock and humans, including African trypanosomiasis and Chagas disease. Adaptation to diverse environments and changes in nutritional conditions is essential for T. brucei to establish an infection when changing hosts or during invasion of different host tissues. One such adaptation is the ability of T. brucei to rapidly switch its energy metabolism from glucose metabolism in the mammalian blood to proline catabolism in the insect stages and vice versa. However, the mechanisms that support the parasite's response to nutrient availability remain unclear. Using RNAseq and qRT-PCR, we investigated the response of T. brucei to amino acid or glucose starvation and found increased mRNA levels of several amino acid transporters, including all genes of the amino acid transporter AAT7-B subgroup. Functional characterization revealed that AAT7-B members are plasma membrane-localized in T. brucei and when expressed in Saccharomyces cerevisiae supported the uptake of proline, alanine, and cysteine, while other amino acids were poorly recognized. All AAT7-B members showed a preference for proline, which is transported with high or low affinity. RNAi-mediated AAT7-B downregulation resulted in a reduction of intracellular proline concentrations and growth arrest under low proline availability in cultured procyclic form parasites. Taken together, these results suggest a role of AAT7-B transporters in the response of T. brucei to proline starvation and proline catabolism.
Identifiants
pubmed: 33745971
pii: S0021-9258(21)00344-6
doi: 10.1016/j.jbc.2021.100566
pmc: PMC8094907
pii:
doi:
Substances chimiques
Amino Acid Transport Systems, Neutral
0
proline transporter
9040-98-6
Alanine
OF5P57N2ZX
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
100566Informations de copyright
Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.
Déclaration de conflit d'intérêts
Conflict of interest The authors declare that they have no conflicts of interest with the contents of this article.
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