Ulvan, a kind of polyanionic heteropolysaccharide consisting of 3-sulfated rhamnose, uronic acids (iduronic acid and glucuronic acid) and xylose, has been widely applied in food and cosmetic industries. In addition, ulvan can be converted into fermentable monosaccharides through the cascade system of carbohydrate-active enzymes. Ulvan lyases can degrade ulvan into ulvan oligosaccharides, which is the first step in the fully degradation of ulvan. Various ulvan lyases have been cloned and characterized from marine bacteria and grouped into five polysaccharide lyase (PL) families, namely: PL24, PL25, PL28, PL37 and PL40 families. The elucidation of the biochemical characterization, action pattern and catalytic mechanism of ulvan lyase would definitely enhance our understanding of the deep utilization of marine bioresource and marine carbon cycling. In this review, we summarized the recent progresses about the source and biochemical characteristics of ulvan lyase. Additionally, the structural characteristics and catalytic mechanisms have been introduced in detail. This comprehensive information should be helpful regarding the application of ulvan lyases.

中文翻译：

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洞裂裂解酶的见解：来源，生化特征，结构和催化机理的综述。

Ulvan是一种由3-硫酸鼠李糖，糖醛酸（艾杜糖酸和葡糖醛酸）和木糖组成的聚阴离子杂多糖，已广泛应用于食品和化妆品行业。此外，ulvan可以通过碳水化合物活性酶的级联系统转化为可发酵的单糖。ulvan裂解酶可以将ulvan降解为ulvan寡糖，这是ulvan完全降解的第一步。已从海洋细菌中克隆并鉴定了各种ulvan裂解酶，并将其分为五个多糖裂解酶（PL）家族，即：PL24，PL25，PL28，PL37和PL40家族。对ulvan lyase的生化特性，作用方式和催化机理的阐明肯定会加深我们对海洋生物资源和海洋碳循环的深度利用的理解。在这篇综述中，我们总结了关于ulvan lyase的来源和生化特性的最新进展。另外，已经详细介绍了结构特征和催化机理。这些全面的信息应有助于ulvan裂解酶的应用。