Journal
NUCLEIC ACIDS RESEARCH
Volume 34, Issue 14, Pages 3947-3954Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkl549
Keywords
-
Categories
Ask authors/readers for more resources
GTP hydrolysis catalyzed in the ribosome by a complex of two polypeptide release factors, eRF1 and eRF3, is required for fast and efficient termination of translation in eukaryotes. Here, isothermal titration calorimetry is used for the quantitative thermodynamic characterization of eRF3 interactions with guanine nucleotides, eRF1 and Mg2+. We show that (i) eRF3 binds GDP (K-d = 1.9 mu M) and this interaction depends only minimally on the Mg2+ concentration; (ii) GTP binds to eRF3 (K-d = 0.5 mu M) only in the presence of eRF1 and this interaction depends on the Mg2+ concentration; (iii) GTP displaces GDP from the eRF1 center dot eRF3 center dot GDP complex, and vice versa; (iv) eRF3 in the GDP-bound form improves its ability to bind eRF1; (v) the eRF1 center dot eRF3 complex binds GDP as efficiently as free eRF3; (vi) the eRF1 center dot eRF3 complex is efficiently formed in the absence of GDP/GTP but requires the presence of the C-terminus of eRF1 for complex formation. Our results show that eRF1 mediates GDP/GTP displacement on eRF3. We suggest that after formation of eRF1 center dot eRF3 center dot GTP center dot Mg2+, this quaternary complex binds to the ribosomal pretermination complex containing P-site-bound peptidyl-tRNA and the A-site-bound stop codon. The guanine nucleotide binding properties of eRF3 and of the eRF3 center dot eRF1 complex profoundly differ from those of prokaryotic RF3.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available