Abstract
The nucleotide sequence of the Escherichia coli colicin I receptor gene (cir) has been determined. The predicted mature protein consists of 599 amino acids and has a molecular weight of 67,169. Several previously noted characteristics of other E. coli outer membrane protein sequences were also identified in the sequence of Cir. These include an overall acidic nature, the absence of long hydrophobic stretches of amino acids, and a lack of predicted alpha-helical secondary structure. Because two classes of outer membrane proteins (the TonB-dependent transport proteins and the porins) share some structural features, protein sequences from both of these groups were aligned pairwise and scored for sequence similarity. Statistical evidence suggested that the porins were not related to the proteins in the TonB-dependent group; however, there was a significant relationship between the proteins in the TonB-dependent group. On the basis of the multiple progressive sequence alignment and the similarity scores derived from it, a tree representing evolutionary distance between five TonB-dependent outer membrane transport proteins was generated.
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