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EMBO J. 1982; 1(3): 311–315.
PMCID: PMC553041

Sequence of a 1.26-kb DNA fragment containing the structural gene for E.coli initiation factor IF3: presence of an AUU initiator codon.

Abstract

The nucleotide sequence of a 1.26-kb pair DNA fragment containing the structural gene for Escherichia coli initiation factor IF3 has been determined. An open reading frame of 540 nucleotides is found at the position predicted by genetic studies. The amino-acid sequence deduced from the DNA sequence accounts for a molecular weight 20 530. The important feature of the coding DNA sequence is the presence of AUU as the translational initiator codon. It is 11 bases downstream of the center of a GGAGG sequence, which can strongly pair with the sequence CCUCC near the 3' terminus of 16S rRNA. The primary DNA sequence in the region of the AUU initiator codon and its role in compensating a reduced codon-anticodon interaction in initiation complex formation are discussed.

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