Studies on a rat liver subcellular poly A-rich RNA fraction with glutamate dehydrogenase template activity

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Messenger RNA (mRNA) plays a crucial role in protein synthesis.
• Polyadenylated mRNA (poly A-mRNA) is a specific class of mRNA found in eukaryotes.
• Understanding mRNA function requires effective isolation and characterization techniques.

Purpose of the Study:

• To isolate and characterize a heterogeneous poly A-mRNA fraction from rat liver microsomes.
• To assess the translational activity of the isolated mRNA fraction.
• To develop a method for monitoring enzyme biosynthesis.

Main Methods:

• Phenol:chloroform extraction for RNA isolation.
• Millipore filtration for fraction purification.
• Poly U-agarose affinity chromatography for poly A-mRNA enrichment.
• Cell-free translation systems using microsomes or polysomes.
• Spectrophotometric analysis for enzyme biosynthesis monitoring.

Main Results:

• A heterogeneous poly A-mRNA fraction was successfully isolated from rat liver microsomes.
• The isolated fraction exhibited high template activity for glutamate dehydrogenase synthesis.
• Characterization included analysis of secondary structures and poly A tail content.
• A spectrophotometric assay was established to track enzyme biosynthesis.

Conclusions:

• The isolated poly A-mRNA fraction is translationally active and serves as a template for glutamate dehydrogenase.
• The developed methods allow for effective isolation and characterization of specific mRNA populations.
• This study provides a foundation for further investigations into gene expression and protein synthesis in liver cells.