PMID:10781576

Citation	Widmann, M and Christen, P (2000) Comparison of folding rates of homologous prokaryotic and eukaryotic proteins. J. Biol. Chem. 275:18619-22
Abstract	The rate of polypeptide chain elongation is up to one order of magnitude faster in prokaryotic cells than in eukaryotes. Here we report that the rates of in vitro refolding of orthologous prokaryotic and eukaryotic proteins correlate with their differential rates of biosynthesis. The mitochondrial and cytosolic aspartate aminotransferases of chicken and aspartate aminotransferase of Escherichia coli show pairwise sequence identities of 41-48% and nearly identical three-dimensional structures. Nevertheless, the prokaryotic enzyme refolded 6 times faster (at 25 degrees C) than the eukaryotic isoenzymes after denaturation in 6 m guanidine hydrochloride. Prokaryotic malate dehydrogenase and lactate dehydrogenase also renatured faster than their orthologous eukaryotic counterparts, suggesting that evolutionary pressure has adapted the rate of folding to the rate of elongation of polypeptide chains.
Links	PubMed Online version:10.1074/jbc.C000156200
Keywords	Aspartate Aminotransferases/metabolism; Bacterial Proteins/metabolism; Escherichia coli/enzymology; Eukaryotic Cells/metabolism; Prokaryotic Cells/metabolism; Protein Folding
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