Sargassum siliquastrum
National Institutes of Health
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南欧紫荆萌发种子的提取液，经硫酸铵分级沉淀，ＤＥＡＥ－纤维素柱层析，Ｂｉｏ－Ｇｅｌ Ｐ－６０和Ｓｅｐｈａｄｅｘ Ｇ－１００柱层析，得到了酶活为９８．６μ／ｍｇ的甘露聚糖酶。柱层析和聚丙烯酰胺凝胶电泳均表明其为均一性物质。南欧紫荆甘露聚糖酶由两个分子量为２万的相同亚基组成，可将以甘露聚糖为主链的多种半纤维素水解为含４￣６个单糖残基的寡糖片断。它的最适ｐＨ为５，最适温度为３７℃。Ｚｎ＾２＋对该酶活性有