Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:1.9.3.1 (cytochrome oxidase)
 8,822 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The cytochrome oxidase activity of Bacillus strains was analyzed quantitatively by colorimetric N, N, N', N'-tetramethyl-p-phenylene-diamine (TMPD) oxidase assay. Twenty six type strains were readily grouped, the oxidase positive, the oxidase negative, and the oxidase indeterminate groups. TMPD-dependent oxidase activities for whole cells and sonicated cells were compared. Spectral absorbance analyses of membrane fractions showed that all 26 Bacillus type strains contained the o-type cytochrome oxidase; 19 strains contained cytochrome a + a3 and among which 5 strains contained cytochromed. All of the 10 thermophilic Bacillus strains, which were predominantly oxidase positive, exhibited maximum oxidase activity when grown at optimum temperature (65 degrees C). The other three "caldo-active" thermophiles exhibited maximum oxidase activities when grown at their optimum temperatures, 70 degrees C to 80 degrees C. Mesophilic B. cereus and B. subtilis exhibited maximum oxidase activity in cells grown at 42 degrees C and 55 degrees C, respectively. In no case did growth temperature induce oxidase negative strains to exhibit an oxidase positive reaction, and vice versa.
Zhonghua Min Guo Wei Sheng Wu Ji Mian Yi Xue Za Zhi 1989 Nov
PMID:Effects of sonication and growth temperature on the cytochrome oxidase activity of Bacillus species. 256 57

The mitochondrial complexes are prone to sirtuin (Sirt)3-mediated deacetylation modification, which may determine cellular response to stimuli, such as oxidative stress. In this study, we show that the cytochrome c oxidase (COX)-1, a core catalytic subunit of mitochondrial complex IV, was acetylated and deactivated both in 2,2'-azobis(2-amidinopropane) dihydrochloride-treated NIH/3T3 cells and hydrogen peroxide-treated primary neuronal cells, correlating with apoptotic cell death induction by oxidative stress. Inhibition of Sirt3 by small interfering RNA or the inhibitor nicotinamide induced accumulation of acetylation of COX-1, reduced mitochondrial membrane potential, and increased cell apoptosis. In contrast, overexpression of Sirt3 enhanced deacetylation of COX-1 and inhibited oxidative stress-induced apoptotic cell death. Significantly, rats treated with ischemia/reperfusion injury, a typical oxidative stress-related disease, presented an inhibition of Sirt3-induced hyperacetylation of COX-1 in the brain tissues. Furthermore, K13, K264, K319, and K481 were identified as the acetylation sits of COX-1 in response to oxidative stress. In conclusion, COX-1 was discovered as a new deacetylation target of Sirt3, indicating that the Sirt3/COX-1 axis is a promising therapy target of stress-related diseases.-Tu, L.-F., Cao, L.-F., Zhang, Y.-H., Guo, Y.-L., Zhou, Y.-F., Lu, W.-Q., Zhang, T.-Z., Zhang, T., Zhang, G.-X., Kurihara, H., Li, Y.-F., He, R.-R. Sirt3-dependent deacetylation of COX-1 counteracts oxidative stress-induced cell apoptosis.
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PMID:Sirt3-dependent deacetylation of COX-1 counteracts oxidative stress-induced cell apoptosis. 3164 84