infC 171 IF-3 binds to the 30S ribosomal subunit and shifts the equilibrum between 70S ribosomes and their 50S and 30S subunits in favor of the free subunits, thus enhancing the availability of 30S subunits on which protein synthesis initiation begins (By similarity). Translation initiation factor IF-3 MKEYLTNERIRAKQVRVVGPDGKQLGIMDTREALRLAQEMDLDLVLVGPNADPPVARIMDYSKWRYEQQMAEKEARKKAKRTEVKSIKFRVKIDEHDYQTKLGHIKRFLQEGHKVKVTIMFRGREVAHPELGERILNRVTEDLKDLAVVEMKPEMLGRDMNMLLAPVKVSA IF3_THETH