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Physiological roles of catalases Cat1 and Cat2 in Myxococcus xanthus

  • Microbial Physiology and Biochemistry
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Abstract

Catalases are key antioxidant enzymes in aerobic organisms. Myxococcus xanthus expresses two monofunctional catalases, small-subunit Cat1 and large-subunit Cat2. The Km of H2O2 for recombinant Cat1 and Cat2 were 14.0 and 9.0 mM, respectively, and the catalytic efficiency of Cat2 (kcat/Km = 500 sec−1 mM−1) was 4-fold higher than that of Cat1. The activity ratio of Cat1 to Cat2 in the exponential growth phase of M. xanthus was 1 to 3–4. A Cat1-deficient strain was constructed, whereas a Cat2-deficient strain could not be produced In H2O2-supplemented medium, the cat1 mutant exhibited marked growth retardation and a longer generation time than the wild-type (wt) strain. After 2 h of incubation in 0.5 mM H2O2-supplemented medium, the catalase activity of the wt strain significantly increased (by 64-fold), but that of the cat1 mutant strain did not. Under starvation-induced developmental conditions, catalase activity was induced by approximately 200-fold in both wt and cat1 strains, although in the mutant the activity increase as well as spore formation occurred one day later, indicating that the induction of catalase activity during starvation was due to Cat2. In wt starved cells, catalase activity was not induced by H2O2. These results suggest that Cat2 is the primary housekeeping catalase during M. xanthus growth and starvation-induced development, whereas Cat1 may have a complementary role, being responsible for the rapid degradation of H2O2 in proliferating vegetative cells subjected to oxidative stress.

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  1. Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Kagawa, 761-0795, Japan

    Kimura Yoshio, Yuri Yoshioka & Kie Toshikuni

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  1. Kimura Yoshio
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  2. Yuri Yoshioka
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Correspondence to Kimura Yoshio.

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Yoshio, K., Yoshioka, Y. & Toshikuni, K. Physiological roles of catalases Cat1 and Cat2 in Myxococcus xanthus. J Microbiol. 60, 1168–1177 (2022). https://doi.org/10.1007/s12275-022-2277-7

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