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Tolerance for random recombination of domains in prokaryotic and eukaryotic translation systems: Limited interdomain misfolding in a eukaryotic translation system
Author(s) -
Hirano Nobutaka,
Sawasaki Tatsuya,
Tozawa Yuzuru,
Endo Yaeta,
Takai Kazuyuki
Publication year - 2006
Publication title -
proteins: structure, function, and bioinformatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.699
H-Index - 191
eISSN - 1097-0134
pISSN - 0887-3585
DOI - 10.1002/prot.21008
Subject(s) - translation (biology) , eukaryotic translation , biology , computational biology , microbiology and biotechnology , evolutionary biology , physics , genetics , gene , messenger rna
It has been proposed that eukaryotic translation systems have a greater capacity for cotranslational folding of domains than prokaryotic translation systems, which reduces interdomain misfolding in multidomain proteins and, therefore, leads to tolerance for random recombination of domains. However, there has been a controversy as to whether prokaryotic and eukaryotic translation systems differ in the capacity for cotranslational domain folding. Here, to examine whether these systems differ in the tolerance for the random domain recombination, we systematically combined six proteins, out of which four are soluble and two are insoluble when produced in an Escherichia coli and a wheat germ cell‐free protein synthesis systems, to construct a fusion protein library. Forty out of 60 two‐domain proteins and 114 out of 120 three‐domain proteins were more soluble when produced in the wheat system than in the E. coli system. Statistical analyses of the solubilities and the activities indicated that, in the wheat system but not in the E. coli system, the two soluble domains comprised mainly of β‐sheets tend to avoid interdomain misfolding and to fold properly even at the neighbor of the misfolded domains. These results demonstrate that a eukaryotic system permits the concomitance of a wider variety of domains within a single polypeptide chain than a prokaryotic system, which is probably due to the difference in the capacity for cotranslational folding. This difference is likely to be related to the postulated difference in the tolerance for random recombination of domains. Proteins 2006. © 2006 Wiley‐Liss, Inc.