Peptidyl transferase activity in wheat germ ribosomes. Effect of some antibiotics

Area of Science:

• Molecular Biology
• Biochemistry
• Ribosome Function

Background:

• Ribosomes are essential cellular machinery responsible for protein synthesis.
• Understanding ribosome-catalyzed reactions, like fragment reactions, is crucial for deciphering translation mechanisms.

Purpose of the Study:

• To characterize the formation of N-acetyl-leucyl-puromycin via a fragment reaction.
• To investigate the effects of specific antibiotics on this ribosome-catalyzed process.

Main Methods:

• Utilized 80 S ribosomes isolated from wheat germ.
• Employed high-voltage electrophoresis for reaction product identification.
• Assessed the inhibitory effects of various antibiotics on the fragment reaction.

Main Results:

• Successfully characterized the formation of N-acetyl-leucyl-puromycin.
• Identified sparsomycin, blasticidin S, and gougerotin as potent inhibitors.
• Observed that amicetin and tetracycline showed lesser inhibitory effects.
• Found strong stimulation of an acLeu-pentanucleotide-ribosomes complex by sparsomycin.

Conclusions:

• The fragment reaction catalyzed by wheat germ 80 S ribosomes is sensitive to specific antibiotics.
• Sparomycin exhibits a dual role, inhibiting the reaction while stimulating complex formation, suggesting intricate regulatory mechanisms.