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Nucleotide sequence of nucleolar U3B RNA
The Journal of Biological Chemistry
|November 10, 1979
Summary
Researchers determined the nucleotide sequence of U3B, a prominent nucleolar RNA in Novikoff hepatoma cells. This study reveals the primary sequence and proposed secondary structure of U3B RNA, contributing to our understanding of nucleolar RNA function.
Area of Science:
- Molecular Biology
- RNA Biochemistry
- Cell Biology
Background:
- Novikoff hepatoma ascites cells contain three distinct nucleolar RNAs: U3A, U3B, and U3C.
- U3B is the most abundant of these U3 species, making it a key focus for molecular investigation.
Purpose of the Study:
- To determine the primary nucleotide sequence of the U3B nucleolar RNA.
- To elucidate the secondary structure of U3B RNA based on its sequence and localized regions.
Main Methods:
- Purification of U3B RNA from Novikoff hepatoma ascites cells.
- Enzymatic digestion procedures, including 32P-labeling, RNA ligase, and polynucleotide kinase treatments.
- Sequence determination using established biochemical and analytical techniques.
Main Results:
- The complete primary nucleotide sequence of U3B RNA was determined.
- The 5'-terminus of U3B RNA was identified as having a "cap" structure.
- Purine-rich regions near the 3'-terminus were identified and proposed to form hydrogen bonds in the secondary structure.
Conclusions:
- The determined primary sequence provides a foundational understanding of U3B RNA.
- The proposed secondary structure offers insights into the molecule's functional conformation within the nucleolus.
- This research contributes to the broader knowledge of nucleolar RNA composition and structure.