PURIFICATION AND CHARACTERIZATION OF A CATALASE-PEROXIDASE AND A TYPICAL CATALASE FROM THE BACTERIUM KLEBSIELLA-PNEUMONIAE

被引:78
作者
HOCHMAN, A
GOLDBERG, I
机构
[1] The Department of Biochemistry, George S. Wise Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv
关键词
CATALASE-PEROXIDASE; TYPICAL CATALASE; CATALYTIC ACTIVITY; (KLEBSIELLA-PNEUMONIAE);
D O I
10.1016/0167-4838(91)90544-A
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The bacterium Klebsiella pneumoniae synthesizes three different types of catalase: a catalase-peroxidase, a typical catalase and an atypical catalase, designated KpCP, KpT and KpA, respectively (Goldberg, I. and Hochman, A. (1989) Arch. Biochem. Biophys. 268, 124-128). KpCP, but not the other two enzymes, in addition to the catalatic activity, catalyzes peroxidatic activities with artificial electron donors, as well as with NADH and NADPH. Both KpCP and KpT are tetramers, with heme IX as a prosthetic group, and they show a typical high-spin absorption spectrum which is converted to low-spin when a cyanide complex is formed. The addition of dithionite to KpCP causes a shift in the absorption maxima typical of ferrous heme IX. KpCP has a pH optimum of 6.3 for the catalatic activity and 5.2-5.7 for the peroxidatic activity, and relatively low 'K(m)' values: 6.5 mM and 0.65 H2O2 for the catalatic and peroxidatic activities, respectively. The activity of the catalase-peroxidase is inhibited by azide and cyanide, but not by 3-amino-1,2,4-triazole. KpT has wide pH optimum: 5-10.5 and a 'K(m)' of 50 mM H2O2, it is inhibited by incubation with 3-amino-1,2,4-triazole and by the acidic forms of cyanide and azide. A significant distinction between the typical catalase and the catalase-peroxidase is the stability of their proteins: KpT is more stable than KpCP to H2O2, temperature, pH and urea.
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页码:299 / 307
页数:9
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