Abstract
The flavoprotein (Fp) subunit of human mitochondrial succinate-ubiquinone reductase (SQR, complex II) has isoforms (type I, type II). Type II Fp is predominantly expressed in some cancer and fetal tissues and those tissues are often exposed to ischemia. The present study shows that complex II with type II Fp has lower optimal pH than complex II with type I Fp, and type II Fp mRNA expression was induced by ischemia. The result suggests complex II with type II Fp may function in cells with low mitochondrial matrix pH caused by ischemia and its function is related to cellular adaptation to ischemia.
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