A novel purine nucleoside transporter whose expression is up-regulated in the short stumpy form of the Trypanosoma brucei life cycle

2004 ◽  
Author(s):  
M SANCHEZ
Keyword(s):  
Life Cycle ◽  
Trypanosoma Brucei ◽  
Purine Nucleoside ◽  
Nucleoside Transporter ◽  
Stumpy Form

A novel purine nucleoside transporter whose expression is up-regulated in the short stumpy form of the Trypanosoma brucei life cycle

2004 ◽  
Vol 136 (2) ◽  
pp. 265-272 ◽  
Author(s):  
Marco A. Sanchez ◽  
Scott Drutman ◽  
Marleen van Ampting ◽  
Keith Matthews ◽  
Scott M. Landfear
Keyword(s):  
Life Cycle ◽  
Trypanosoma Brucei ◽  
Purine Nucleoside ◽  
Nucleoside Transporter ◽  
Stumpy Form

scholarly journals Protein tyrosine phosphatase TbPTP1: a molecular switch controlling life cycle differentiation in trypanosomes

2006 ◽  
Vol 175 (2) ◽  
pp. 293-303 ◽  
Author(s):  
Balázs Szöőr ◽  
Jude Wilson ◽  
Helen McElhinney ◽  
Lydia Tabernero ◽  
Keith R. Matthews
Keyword(s):  
Life Cycle ◽  
Trypanosoma Brucei ◽  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Tsetse Fly ◽  
Mammalian Host ◽  
African Trypanosomes ◽  
Protein Tyrosine ◽  
Ptp1b Inhibitors ◽  
Stumpy Form

Differentiation in African trypanosomes (Trypanosoma brucei) entails passage between a mammalian host, where parasites exist as a proliferative slender form or a G0-arrested stumpy form, and the tsetse fly. Stumpy forms arise at the peak of each parasitaemia and are committed to differentiation to procyclic forms that inhabit the tsetse midgut. We have identified a protein tyrosine phosphatase (TbPTP1) that inhibits trypanosome differentiation. Consistent with a tyrosine phosphatase, recombinant TbPTP1 exhibits the anticipated substrate and inhibitor profile, and its activity is impaired by reversible oxidation. TbPTP1 inactivation in monomorphic bloodstream trypanosomes by RNA interference or pharmacological inhibition triggers spontaneous differentiation to procyclic forms in a subset of committed cells. Consistent with this observation, homogeneous populations of stumpy forms synchronously differentiate to procyclic forms when tyrosine phosphatase activity is inhibited. Our data invoke a new model for trypanosome development in which differentiation to procyclic forms is prevented in the bloodstream by tyrosine dephosphorylation. It may be possible to use PTP1B inhibitors to block trypanosomatid transmission.

scholarly journals Metabolic reprogramming during the Trypanosoma brucei life cycle

F1000Research ◽  
2017 ◽  
Vol 6 ◽  
pp. 683 ◽  
Author(s):  
Terry K. Smith ◽  
Frédéric Bringaud ◽  
Derek P. Nolan ◽  
Luisa M. Figueiredo
Keyword(s):  
Life Cycle ◽  
Trypanosoma Brucei ◽  
Model Organism ◽  
Protozoan Parasite ◽  
Tsetse Fly ◽  
Metabolic Reprogramming ◽  
Mammalian Host ◽  
Insect Vector ◽  
Environmental Signals ◽  
Cellular Metabolic Activity

Cellular metabolic activity is a highly complex, dynamic, regulated process that is influenced by numerous factors, including extracellular environmental signals, nutrient availability and the physiological and developmental status of the cell. The causative agent of sleeping sickness, Trypanosoma brucei, is an exclusively extracellular protozoan parasite that encounters very different extracellular environments during its life cycle within the mammalian host and tsetse fly insect vector. In order to meet these challenges, there are significant alterations in the major energetic and metabolic pathways of these highly adaptable parasites. This review highlights some of these metabolic changes in this early divergent eukaryotic model organism.

Ultrastructural Changes of the Mitochondrion During the Life Cycle of Trypanosoma brucei

2021 ◽  
Author(s):  
Tomáš Bílý ◽  
Shaghayegh Sheikh ◽  
Adeline Mallet ◽  
Philippe Bastin ◽  
David Pérez‐Morga ◽  
...  
Keyword(s):  
Life Cycle ◽  
Trypanosoma Brucei ◽  
Ultrastructural Changes

scholarly journals Enzymatic Synthesis of Therapeutic Nucleosides using a Highly Versatile Purine Nucleoside 2’‐DeoxyribosylTransferase from Trypanosoma brucei

ChemCatChem ◽  
2018 ◽  
Vol 10 (19) ◽  
pp. 4406-4416 ◽  
Author(s):  
Elena Pérez ◽  
Pedro A. Sánchez‐Murcia ◽  
Justin Jordaan ◽  
María Dolores Blanco ◽  
José Miguel Mancheño ◽  
...  
Keyword(s):  
Trypanosoma Brucei ◽  
Enzymatic Synthesis ◽  
Purine Nucleoside

Diverse patterns of expression of the cytochrome c oxidase subunit I gene and unassigned reading frames 4 and 5 during the life cycle of Trypanosoma brucei

1985 ◽  
Vol 5 (11) ◽  
pp. 3041-3047
Author(s):  
D P Jasmer ◽  
J E Feagin ◽  
K Stuart
Keyword(s):  
Life Cycle ◽  
Cytochrome C ◽  
Cytochrome C Oxidase ◽  
Trypanosoma Brucei ◽  
Protein Coding ◽  
Oxidase Subunit ◽  
Life Cycle Stages ◽  
Multiple Processes ◽  
Mitochondrial Transcripts ◽  
Reading Frames

Transcription of a maxicircle segment from Trypanosoma brucei 164 that contains nucleotide (nt) sequences corresponding to cytochrome c oxidase subunit I (COI) and unassigned reading frames (URFs) 4 and 5 of other mitochondrial systems was investigated. Two major transcripts that differ in size by ca. 200 nt map to each of the COI and URF4 genes, while a single major transcript maps to URF5. In total RNA, the larger COI transcript is more abundant in procyclic forms (PFs) than in bloodstream forms (BFs), the smaller COI and both URF4 transcripts have similar abundances in both forms, and the single URF5 transcript is more abundant in BF than PF. These patterns of expression differ in poly(A)+ RNA as a result of a higher proportion of poly(A)+ mitochondrial transcripts in PFs than in BFs. In addition, small (300- to 500-nt) RNAs that are transcribed from C-rich sequences located between putative protein-coding genes also exhibit diverse patterns of expression between life cycle stages and differences in polyadenylation in PFs compared with BFs. These observations suggest that multiple processes regulate the differential expression of mitochondrial genes in T. brucei.

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