... [39,40]. The E a values of BLXI inactivation were calculated for the apoenzyme in the presence and absence of metals(Table 3). The nature of the metal present clearly affected the E a of BLXI inactivation. ... Structural distribution of stabilityin a thermophilic enzyme. Proc. Natl Acad. Sci. USA 96,13674–13678.3. Hasegawa, J., Uchiyama, S., Tanimoto, Y. , Mizutani, M.,Kobayashi, Y. , Sambongi, Y. & ... that the precipitatedenzyme was completely inactive, and that the solublefraction remained fully active. The Arrhenius plot of BLXI inactivation rates was linear (not shown) with an E a of...