Prokaryotic release factors
From Infogalactic: the planetary knowledge core
There are three known prokaryotic release factors involved in the termination of translation. RF1 and RF2 are so called class 1 release factors and RF3 a class 2 release factor.
- RF1 recognize stop codons UAA and UAG.
- RF2 recognize stop codons UAA and UGA.
- RF3 promotes termination by either factor by accelerating dissociation.
The release factors provide the means of termination by having a conformation that mimics that of tRNA molecules. The decoding release factor binds to the A site of the ribosome and directly recognises the stop codon.[1] Once RF1 (or RF2) is bound to the ribosome, the polypeptide is released, and the ribosome and release factors disassemble, thus completing the process of translation.[2]
References
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