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- W2034355380 abstract "The intrinsic enthalpy changes (corrected for hydration of D-glyceraldehyde 3-phosphate) for the reactions catalyzed by the alpha and beta 2 subunits of tryptophan synthase from Escherichia coli have been determined calorimetrically. Cleavage of indoleglycerol phosphate (alpha reaction) was found to be associated with a delta H value of 54.0 +/- 2.5 kJ mol-1, while condensation of indole with L-serine (beta reaction) involved -80.3 +/- 4.6 kJ mol-1'. By direct determination of the enthalpy concomitant with the overall synthesis of tryptophan from indoleglycerol phosphate and L-serine an enthalpy value of -13.4 +/- 5.6 kJ mol-1 was observed. In view of the uncertainties of the literature data used for calculation of the hydration contribution, the agreement between the directly measured delta H value of the overall reaction and the sum of the enthalpies of the alpha and beta reactions is fair. Deamination of L-serine, a side reaction catalyzed preferentially by the isolated beta 2 pyridoxal 5'-phosphate2 subunit, was shown to be associated with an enthalpy change of -7.3 +/- 0.4 kJ mol-1." @default.
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- W2034355380 date "1985-11-01" @default.
- W2034355380 modified "2023-09-27" @default.
- W2034355380 title "Thermodynamics of the reactions catalyzed by the multifunctional enzyme complex tryptophan synthase" @default.
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- W2034355380 doi "https://doi.org/10.1016/0003-9861(85)90228-0" @default.
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