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In many prokaryotes, asymmetrical mutational or selective pressures have caused compositional skews between complementary strands of replication arms, especially sensitive in the distribution of guanine and cytosine. In Escherichia coli, most of the guanine/cytosine skew is caused by mutation rates differing on leading and lagging strands, but contribution of skewed functionally important guanine-rich...
The E. coli chromosome replication arms are polarized by motifs such as RRNAGGGS oligomers, found preferentially on leading strands. Their skew increases regularly from the origin to dif (the site in the center of the terminus where chromosome dimer resolution occurs), to reach a value of 90% near dif. Convergent information indicates that polarization in opposite directions from the dif region controls...
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