Anthocyanidin reductase(ANR) is a key enzyme in the biosynthetic pathway of proanthocyanidins(PAs),which catalyzes anthocyanidins into the corresponding 2,3-cis-flavan-3-ols.For researching enzymatic characteristics of the enzyme,this study was carried out to express and purify the protein by prokaryotic expression and Cobalt ion affinity column purification.The optimal conditions of CsANR1 were observed at 40℃ and pH 6.5.The more substrate preference of CsANR1 was showed on cyanidin over delphinidin.Moreov...