Functional analysis of the residues C770 and G771 of E. coli 16S rRNA implicated in forming the intersubunit bridge B2c of the ribosome.
Structural analyses have shown that nucleotides at the positions 770 and 771 of Escherichia coli 16S rRNA are implicated in forming one of highly conserved intersubunit bridges of the ribosome, B2c. To examine a functional role of these residues, base substitutions were introduced at these positions and mutant ribosomes were analyzed for their protein synthesis ability using a specialized ribosome system. The results showed requirement of a pyrimidine at the position 770 for ribosome function regardless of the nucleotide identity at the position 771. Sucrose gradient profiles of ribosomes revealed that the loss of protein-synthesis ability of mutant ribosome bearing a base substitution from C to G at the position 770 stems from its inability to form 70S ribosomes. These findings indicate involvement of nucleotide at the position 770, not 771, in ribosomal subunit association and provide a useful rRNA mutation that can be used as a target to investigate the physical interaction between 16S and 23S rRNA.
Department ofLife Science, Chung-Ang University, Seoul 156-756, Korea.
Hong-Man
HM
Kim
Ji-Hyun
JH
Yeom
Hye-Jung
HJ
Ha
Jong-Myung
JM
Kim
Kangseok
K
Lee
D001483:Base Sequence; D002499:Centrifugation, Density Gradient; D003596:Cytosine / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D006151:Guanosine / Q000378:metabolism*; D008826:Microbial Sensitivity Tests; D016297:Mutagenesis, Site-Directed; D009690:Nucleic Acid Conformation; D014176:Protein Biosynthesis; D012329:RNA, Bacterial / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012336:RNA, Ribosomal, 16S / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D012270:Ribosomes / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism
D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D006151:Guanosine; D003596:Cytosine