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Biology enzyme qustion for a lab? Why would so many living things exhibit catalase
activity? As you probably already know, catalase breaks down hydrogen peroxide,
which is generated during normal cellular function and which at
physiological levels, serves multiple important roles in cellular redox control &
signaling, and defense against invading pathogens.
However, although H2O2 itself is not all that reactive, it CAN readily cross
cell membranes, and in the presence of transition metals
such as iron & copper, react with O2 to form hydroxyl radical (-OH) which
is VERY reactive and potentially damaging to cells.
And even in the absence of free transition metals, higher than normal peroxide levels
can profoundly influence activities of enzymes that are under redox control, including various kinases, phosphatases and even some transcription factors.
So, regulation of H2O2 levels to prevent either redox imbalance or
full-blown oxidant stress is an important homeostatic requirement.
As long as levels of H2O2 are kept low, it contributes to
normal cellular physiology, but if levels go too high they can cause
problems. So there are mechanisms in place to keep peroxide levels low, under control, and catalase is an important
component of those protective systems. Given the universal importance of cellular redox
regulation, it is not at all surprising that catalase would
be fairly ubiquitous in biological systems.
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