Membrane lipid saturation shift
noun phrasePronunciation: /ˈmembreɪn ˈlɪpɪd ˌsætʃəˈreɪʃən ʃɪft/
The alteration in the ratio of saturated to unsaturated fatty acids within cellular membranes during stress exposure, affecting membrane fluidity and function. Increased saturation typically reduces membrane flexibility and stress tolerance.
Plain English
The change in membrane composition toward more rigid fatty acids during stress, which can impair cell function.
Etymology & History
Usage
"Cold stress induced a membrane lipid saturation shift, reducing the proportion of polyunsaturated fatty acids essential for membrane flexibility."
Style guide notes: Use 'saturation shift' rather than 'saturation change' to indicate directional modification in lipid composition analysis.
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Contrasted with
Related Terms
Frequently Asked Questions
Why is membrane lipid composition important for stress tolerance?
Unsaturated fatty acids maintain membrane fluidity, essential for protein function, nutrient transport, and stress signal transduction across membranes.
How do plants regulate membrane lipid composition under stress?
Plants modulate desaturase enzyme activity to adjust the ratio of unsaturated to saturated fatty acids, maintaining membrane function under stress.
Why Test Candidates on This?
Relevant in specialized research on cold tolerance mechanisms and membrane adaptation; less commonly assessed in routine stress physiology screening.
Required skill level: Expert