孔蛋白(Porin),又稱通道結合蛋白,是一種擁有β摺疊結構的跨膜蛋白。與其他膜輸送蛋白不同,孔蛋白擁有β摺疊片組成的桶狀結構,這使得擁有濃度差的分子能夠進行被動擴散,常發現於線粒體革蘭氏陰性菌葉綠體的表面 [1]

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