Directed mutagenesis identifies amino acid residues involved in elongation factor Tu binding to yeast Phe-tRNAPhe. Journal Article uri icon

Overview

abstract

  • The co-crystal structure of Thermus aquaticus elongation factor Tu.guanosine 5'- [beta,gamma-imido]triphosphate (EF-Tu.GDPNP) bound to yeast Phe-tRNA(Phe) reveals that EF-Tu interacts with the tRNA body primarily through contacts with the phosphodiester backbone. Twenty amino acids in the tRNA binding cleft of Thermus Thermophilus EF-Tu were each mutated to structurally conservative alternatives and the affinities of the mutant proteins to yeast Phe-tRNA(Phe) determined. Eleven of the 20 mutations reduced the binding affinity from fourfold to >100-fold, while the remaining ten had no effect. The thermodynamically important residues were spread over the entire tRNA binding interface, but were concentrated in the region which contacts the tRNA T-stem. Most of the data could be reconciled by considering the crystal structures of both free EF-Tu.GTP and the ternary complex and allowing for small (1.0 A) movements in the amino acid side-chains. Thus, despite the non-physiological crystallization conditions and crystal lattice interactions, the crystal structures reflect the biochemically relevant interaction in solution.

publication date

  • April 1, 2007

Date in CU Experts

  • March 13, 2015 12:56 PM

Full Author List

  • Sanderson LE; Uhlenbeck OC

author count

  • 2

citation count

  • 11

Other Profiles

International Standard Serial Number (ISSN)

  • 0022-2836

Electronic International Standard Serial Number (EISSN)

  • 1089-8638

Additional Document Info

start page

  • 119

end page

  • 130

volume

  • 368

issue

  • 1