3.4.19.3 additional information - alpha6-helix (from Ser188 to Glu205) of PCP-0SH is stably formed in the D1 state 678264 3.4.19.3 additional information - the heat denaturation of wild-type enzyme and mutant enzymes C188S and C142S/C188S is highly reversible in the dimeric forms, but completely irreversible in the tetrameric form 651099 3.4.19.3 additional information - the thermal stability of the mutant enzymes C142S/C188S/E192A, C142S/C188S/E192I, C142S/C188S/E192V, C142S/C188S/E192D and C142S/C188S/E192Q at pH 2.15, pH 3.04 and pH 7.3 is less than that of the cysteine-free mutant enzyme C142S/C188S. At pH 8.7 and 9.6 the thermal stability of mutant enzymes C142S/C188S/E192A, C142S/C188S/E192I, C142S/C188S/E192V and C142S/C188S/E192Q is higher than that of the cysteine-free mutant C142S/C188S. The thermal stability of mutant enzyme C142S/C188S/E192D at pH 8.7 and 9.6 is less than that of cysteine-free mutant enzyme C142S/C188S 667733 3.4.19.3 7.5 8.5 stable 667525 3.4.19.3 22 - room temperature, 40% loss of activity after 15 days, 57% loss of activity after 1 month 95294 3.4.19.3 24 - 50 mM phosphate buffer, pH 7, 10 mM 2-mercaptoethanol, 28% loss of activity after 1 month 95303 3.4.19.3 30 - pH 7.0, 30 min, about 5% loss of activity of wild-type enzyme and of mutant enzyme S185C 650352 3.4.19.3 37 - 1 h, rapid inactivation 95295 3.4.19.3 40 - 4.5 h, stable up to 653759 3.4.19.3 40 - pH 7, 30 min, 5 mM EDTA and 2-mercaptoethanol, stable 95290