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Cyclical differentiation of Trypanosoma brucei involves changes in the cellular complement of calmodulin-binding
L Ruben1, N Haghighat, A Campbell
1Department of Biological Sciences, Southern Methodist University, Dallas, Texas 75275.
Experimental Parasitology
|February 1, 1990
Summary
Calmodulin-binding proteins change during the Trypanosoma brucei life cycle. Specific proteins are present in bloodstream forms but absent in culture forms, indicating developmental regulation.
Area of Science:
- Parasitology
- Molecular Biology
- Biochemistry
Background:
- Calmodulin is a key calcium-binding protein involved in cellular regulation.
- Trypanosoma brucei undergoes cyclical differentiation, a process involving significant cellular changes.
- Understanding protein expression changes during differentiation is crucial for identifying therapeutic targets.
Purpose of the Study:
- To investigate alterations in calmodulin-binding proteins during Trypanosoma brucei differentiation.
- To identify specific calmodulin-binding proteins associated with different life cycle stages.
Main Methods:
- Utilized an [125I]trypanosome calmodulin overlay assay to detect calmodulin-binding proteins.
- Performed competition assays with unlabeled calmodulins to confirm specificity.
- Analyzed homogenates from various Trypanosoma species and mouse tissues.
Main Results:
- Identified calmodulin-binding proteins of Mr 126,000 and 106,000 in slender bloodstream forms, absent in procyclic forms.
- Demonstrated that these proteins bind both trypanosome and bovine brain calmodulin.
- Observed distinct calmodulin-binding patterns in Trypanosoma cruzi and Leishmania tarentolae.
Conclusions:
- The complement of calmodulin-binding proteins is developmentally regulated in Trypanosoma brucei.
- These changes are specific to the trypanosome life cycle and distinct between species.