Elongation factor G participates in ribosome disassembly by interacting with ribosome recycling factor at their tRNA-mimicry domains.
Elongation factor G (EF-G) is a G protein with motor function that drives two target molecules, a tRNA in the translating ribosome and the ribosome recycling factor (RRF) in the post-termination complex. How G protein motor action is transmitted to RRF is unknown. Thermus thermophilus RRF is nonfunctional in Escherichia coli. It became functional upon introducing a plasmid expressing E. coli EF-G with surface changes in its tRNA-mimic domain or by replacing the E. coli EF-G tRNA-mimic domain by the Thermus domain. Thermus RRF could also be activated by introducing surface substitutions in its anticodon arm-mimic region. These gain-of-function phenotypes depend on the combination of heterologous EF-G and RRF alleles. These mutational studies suggest that EF-G motor action is transmitted to RRF by specific surface contacts between the domains that mimic the anticodon arm.
Ito
Koichi
K
Department of Basic Medical Sciences, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.
Fujiwara
Toshinobu
T
Toyoda
Tomohiko
T
Nakamura
Yoshikazu
Y
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016296:Mutagenesis; D020653:Peptide Elongation Factor G / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D012343:RNA, Transfer / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012269:Ribosomal Proteins; D012270:Ribosomes / Q000378:metabolism*; D016415:Sequence Alignment; D016963:Thermus thermophilus / Q000235:genetics / Q000378:metabolism
D001426:Bacterial Proteins; D020653:Peptide Elongation Factor G; D011506:Proteins; D011993:Recombinant Fusion Proteins; D012269:Ribosomal Proteins; C087267:ribosome releasing factor; D012343:RNA, Transfer