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- W1583668498 abstract "The refolding of the tetrameric enzyme tryptophanase was facilitated by the chaperonin GroE. Maximum refolding yield of tryptophanase molecules (about 80%) was attained in the presence of a 15-fold excess of GroE 21-mer over tryptophanase monomer. The GroEL subunit was required for this improvement in refolding yield, whereas the GroES subunit was not. Light scattering experiments of the refolding reaction revealed that GroE bound to tryptophanase folding intermediates and suppressed their aggregation. The presence of ATP was required for the efficient dissociation of tryptophanase from GroEL. However, our experiments indicated that tryptophanase dissociated readily from GroEL in the presence of not only ATP, but also in the presence of non-hydrolyzable ATP analogues such as ATP gamma S (adenosine 5'-O-(3-thiotriphosphate)) and AMP-PNP (adenyl-5'-yl imidodiphosphate) as well. Surprisingly, the release of tryptophanase from GroEL was facilitated in the presence of ADP as well. We concluded that the binding of nucleotides such as ATP and ADP changed the conformation of GroEL and facilitated the dissociation of tryptophanase molecules. The conformation formed in the presence of ADP was distinct from the conformation formed in the presence of ATP, as shown by the selective dissociation of various folding proteins from the two conformations." @default.
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- W1583668498 date "1992-09-01" @default.
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- W1583668498 title "Effects of the chaperonin GroE on the refolding of tryptophanase from Escherichia coli. Refolding is enhanced in the presence of ADP." @default.
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- W1583668498 doi "https://doi.org/10.1016/s0021-9258(19)37111-x" @default.
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