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Plant isoamylase-type starch-debranching enzymes (ISAs) hydrolyze α-1,6-linkages in α-1,4/α-1,6-linked polyglucans. Two ISAs, designated PvISA1/2 and PvISA3, were purified from developing seeds of kidney bean by ammonium sulfate fractionation and several column chromatographic procedures. The enzymes displayed different substrate specificities for polyglucans: PvISA1/2 showed broad chain-length specificities, whereas PvISA3 liberated specific chains with a DP of 2 to 4.
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