Document Type
Article
Publication Date
9-3-2013
Abstract
We have cloned genes encoding elongation factors We have cloned genes encoding elongation factors EF-Tu and EF-Ts from Pseudomonas aeruginosa and expressed and purified the proteins to greater than 95% homogeneity. Sequence analysis indicated that P. aeruginosa EF-Tu and EF-Ts are 84% and 55% identical to E. coli counterparts, respectively. P. aeruginosa EF-Tu was active when assayed in GDP exchange assays. Kinetic parameters for the interaction of EF-Tu with GDP in the absence of EF-Ts were observed to be = 33 μM, = 0.003 s−1, and the specificity constant was s−1 μM−1. In the presence of EF-Ts, these values were shifted to = 2 μM, = 0.005 s−1, and the specificity constant was s−1 μM−1. The equilibrium dissociation constants governing the binding of EF-Tu to GDP () were 30–75 nM and to GTP () were 125–200 nM. EF-Ts stimulated the exchange of GDP by EF-Tu 10-fold. P. aeruginosa EF-Tu was active in forming a ternary complex with GTP and aminoacylated tRNA and was functional in poly(U)-dependent binding of Phe-tRNAPhe at the A-site of P. aeruginosa ribosomes. P. aeruginosa EF-Tu was active in poly(U)-programmed polyphenylalanine protein synthesis system composed of all P. aeruginosa components.
Recommended Citation
Palmer, S. O., Rangel, E. Y., Montalvo, A. E., Tran, A. T., Ferguson, K. C., & Bullard, J. M. (2013). Cloning and Characterization of EF-Tu and EF-Ts from Pseudomonas aeruginosa. BioMed Research International, 2013, e585748. https://doi.org/10.1155/2013/585748
Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.
Publication Title
BioMed Research International
DOI
10.1155/2013/585748
Comments
© 2013 Hindawi Publishing Corporation. Published under Creative Commons Attribution License. Original published version available at http://doi.org/10.1155/2013/585748.