title: The nucleotide sequence at the 3'-end of Neurospora crassa 18S-rRNA and studies on the interaction with 5S-rRNA.
abstract: The sequence of more than 100 nucleotides at the 3'-end of Neurospora crassa 18S-rRNA was determined by chemical sequencing techniques. Extensive homologies with 18S-rRNA from other eukaryotes were found. Inspection of the nucleotide sequence at the 3'-end of N. crassa 5S-rRNA revealed the presence of sequences complementary to a region near the 3'-terminus of 18S-rRNA. Under the appropriate conditions a complex was formed between 18S-rRNA and 5S-rRNA (Tm 53 degrees C). Interaction was detected between 5S-rRNA and a specific 3'-terminal fragment from 18S-rRNA and between 18S-rRNA and a specific 3'-terminal fragment from 5S-rRNA. These findings are consistent with the idea that intermolecular base-pairing between nucleotides at the 3'-ends of 18S-rRNA and 5S-rRNA may be functionally important within the ribosome. Further investigation revealed that this intermolecular base-pairing is not essential for ribosome stability.
mesh_terms: D000818:Animals; D001483:Base Sequence; D008970:Molecular Weight; D009491:Neurospora / Q000235:genetics*; D009492:Neurospora crassa / Q000235:genetics*; D009690:Nucleic Acid Conformation; D011132:Polyribosomes / Q000378:metabolism; D014176:Protein Biosynthesis; D012335:RNA, Ribosomal / Q000235:genetics*; D011817:Rabbits; D012156:Reticulocytes / Q000378:metabolism; D013045:Species Specificity
chemical_list: D012335:RNA, Ribosomal