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Why don't eukaryotes (with few exceptions) have operons in their genomes?
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Eukaryotic proteins are frequently huge and corresponding mRNAs are long. Delivery from nucleus to cytoplasm takes time. Assuming that RNA is slightly fragile, making it even longer is not efficient.
Actually, instead of operons that are RNA fusion, Eukaryotes use protein fusions (as multi-domain) solving the problems compartmentalization, co-expression and increased stability.
Posted by: Elena | October 15, 2012 at 04:42 PM