BIOL 2P02 Lecture Notes - Lecture 11: Start Codon, Aldehyde, Prokaryotic Small Ribosomal Subunit
9 Aug 2015
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Met the bacterial trna that inserts trnam methionine at internal aug codons: the initiator trna has unique structural features that distinguish it from all other trnas. context the unique structural features of trnaf. Met change the efficiency with which this trna is recognized by initiator factors: helps to start translation more rapidly alternative trna for meth (without formyl group) than the. The stop codons uaa (ochre), and uga (opal), uag (amber) terminate translation: termination codons are recognized by protein release factors. In bacteria they are used most often with relative frequencies uaa>uga>uag: the class 1 release factors respond to specific termination codons and hydrolyze the polypeptide-trna linkage, the mechanism is similar in bacteria and eukaryotes. In prokaryotes: small rna (srna) can act in either an activator or repressor like manner to activate/inhibit gene expression. In either case the srna gene is elsewhere in the genome and expressed under certain situations, leading to the altered: rna-rna.
