Polygalacturonate 4-alpha-galacturonosyltransferase (GalA T) activity was detected in the microsomal fraction isolated from pumpkin (Cucurbia moschata Duchesne, cv. Tokyou-Kabocha) seedlings using UDP-GalA and 2-aminobenzamide (2AB)-labeled oligogalacturonides. A 2AB-labeled undecagalacturonide was elongated by the attachment of galacturonic acid (GalA) residues to give 2AB-labeled oligogalacturonides with a degree of polymerization (DP) between 12 and 17. Exogenous 2AB-labeled oligogalacturonide acceptors with a DP >3 are effective acceptor molecules for pumpkin GalA T.
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Tadashi Ishii (2002) studied this question.
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