Structural and Functional Insight into ADF/Cofilin from Trypanosoma brucei

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Abstract

The ADF/cofilin family has been characterized as a group of actin-binding proteins critical for controlling the assembly of actin within the cells. In this study, the solution structure of the ADF/cofilin from Trypanosoma brucei (TbCof) was determined by NMR spectroscopy. TbCof adopts the conserved ADF/cofilin fold with a central β-sheet composed of six β-strands surrounded by five α-helices. Isothermal titration calorimetry experiments denoted a submicromolar affinity between TbCof and G-actin, and the affinity between TbCof and ADP-G-actin was five times higher than that between TbCof and ATP-G-actin at low ionic strength. The results obtained from electron microscopy and actin filament sedimentation assays showed that TbCof depolymerized but did not co-sediment with actin filaments and its ability of F-actin depolymerization was pH independent. Similar to actin, TbCof was distributed throughout the cytoplasm. All our data indicate a structurally and functionally conserved ADF/cofilin from Trypanosoma brucei. © 2013 Dai et al.

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Dai, K., Liao, S., Zhang, J., Zhang, X., & Tu, X. (2013). Structural and Functional Insight into ADF/Cofilin from Trypanosoma brucei. PLoS ONE, 8(1). https://doi.org/10.1371/journal.pone.0053639

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