Related Experiment Video
Updated: Aug 5, 2026

Isolation of F1-ATPase from the Parasitic Protist Trypanosoma brucei
Published on: January 22, 2019
Plasma membrane ATP receptors in Trypanosoma cruzi trypomastigotes
J A Inverso1, Y Song, C A Santos-Buch
1Department of Pathology, Cornell University Medical College, New York, NY 10021, USA.
Abstract:
Trypomastigotes of Trypanosoma cruzi were impermeable to exogenous radiolabeled ATP for up to 2 h at 4 degrees C. Radioligand binding assays in the cold showed that trypomastigotes had two populations of saturable ATP receptors (ATP-Rs) and the radioligand interaction was reversed by nonlabeled ATP in concentration-dependent assays. The Kds of high- and low-affinity ATP-Rs were 7.27 x 10(-8) and 4.32 x 10(6)M, respectively. The BmaxS for ATP-R1 and ATP-R2 were 2.05 x 10(-14) and 2.50 x 10(-12) mol/4 x 10(-6) flagellates, respectively, or 3100 ATP-R1 copies per trypomastigote and 376,000 ATP-R2 copies per trypomastigote. ATP,2-methyl-thio-ATP,ITP, and ADP displaced ATP-Rs (IC50s: 2.59 x 10(-6) to 7.84 x 10(-6)M/4 x 10(6) trypomastigotes). UTP, CTP, ADP beta S, Cibacron blue, and azido-ATP were 10-100 times less effective. Atractyloside, adenosine, suramin, cAMP, Basilen blue, and GTP failed to displace T. cruzi ATP-Rs. Infective vertebrate stage trypomastigote ATP-Rs were localized to a family of 63 kDa surface glycopolypeptides and ATP-Rs appeared to be stage-regulated because the noninfective insect epimastigote forms had ATP-Rs with KdS that are not capable of metabolic interactions with host-cell micromolar ATP levels. Trypomastigote ATP-Rs may play an important role in the induction of the process of T. cruzi intracellular parasitosis.
More Related Videos
14:26Purification of Extracellular Trypanosomes, Including African, from Blood by Anion-Exchangers (Diethylaminoethyl-cellulose Columns)
Published on: April 6, 2019
08:48In Vitro Drug Screening Against All Life Cycle Stages of Trypanosoma cruzi Using Parasites Expressing β-galactosidase
Published on: November 5, 2021
Related Concept Videos
ATP Driven Pumps I: An Overview
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
ATP Driven Pumps II: P-type Pumps
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
ATP Driven Pumps III: V-type Pumps
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
Membrane Asymmetry Regulating Transporters
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
American Trypanosomiasis
Antiprotozoal Agents