Sequence Analysis of the cAMP-Dependent Protein Kinase Regulatory Subunit-Like Protein From Trypanosoma brucei

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Abstract

Purpose: Study the N-terminal, C-terminal, and linker regions of the TbPKAr using homology modeling. Methods: The amino acid sequences of the N-terminal, C-terminal, and linker regions of the TbPKAr were individually examined by means of BLAST analysis and in silico secondary structure predictions with several programs. Results: The TbPKAr C-terminal region, showed a well-folded α/β structure, which consists of two concurrent flattened β-barrel-shaped domains that are separated by an elongated central α-helix similar to its mammalian counterpart, the TbPKAr linker region contains a PKA phosphorylation site and was predicted to be rather disordered. Our analysis also indicated that the TbPKAr N-terminal region lacks a docking/dimerization domain but is enriched in motifs known as leucine-rich repeats (LRR). Conclusion: The replacement of the docking/dimerization domain by different structural motifs suggests the inability of TbPKAr to form homodimers; however, the function of the TbPKAr N-terminal LRR-containing domain in Kinetoplastidae parasites is still unknown.

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Araujo, N. A., & Bubis, J. (2019). Sequence Analysis of the cAMP-Dependent Protein Kinase Regulatory Subunit-Like Protein From Trypanosoma brucei. Acta Parasitologica, 64(2), 262–267. https://doi.org/10.2478/s11686-019-00037-9

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