EF-Ts (elongation factor thermo stable) is one of the prokaryotic elongation factors.
EF-Ts serves as the guanine nucleotide exchange factor for EF-Tu (elongation factor thermo unstable), catalyzing the release of guanosine diphosphate from EF-Tu. This enables EF-Tu to bind to a new guanosine triphosphate molecule, release EF-Ts, and go on to catalyze another aminoacyl tRNA addition.
References
EF-Ts Wikipedia(Text) CC BY-SA