Hydroxycinnamates in suberin formation
Hydroxycinnamates in suberin formation
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DOI：
10.1007/s11101-009-9138-4
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发表时间：
2010-03-01
影响因子：
7.7
通讯作者：
Graca, Jose
中科院分区：
文献类型：
--
作者：
Graca, Jose
发现羟基肉桂酸酯以几种形式与木栓质结合：共价连接到脂族木栓质;在木栓质去除后的残留物中;以及在木栓化组织的非极性提取物中以阿魏酸烷基酯的形式。已发现与苏木素相关的羟基肉桂酸酯主要作为阿魏酸衍生物，有时作为阿魏酰胺，并且在较小程度上作为咖啡酸酯。长链ω-羟基酸的阿魏酸酯在木栓素的部分解聚产物中普遍存在。此外，发现能够催化ω-羟基酸的阿魏酰化的酶与木栓化过程时间相关。提出阿魏酸及其二聚体通过酯化成ω-羟基酸，将软木脂族聚酯共价连接到软木相关的多芳族化合物。在这种情况下，阿魏酸酯和相关的羟基肉桂酸酯作为结构上不同的聚合物的交联剂的已知作用将扩大到栓化细胞壁。
Hydroxycinnamates are found associated with suberin in several forms: covalently linked to the aliphatic suberin; in the residue after suberin-removal; and in the non-polar extractives of suberized tissues in the form of alkyl ferulates. Suberin-associated hydroxycinnamates have been found mainly as ferulic acid-derivatives, sometimes as feruloylamides and in a lesser extent as caffeates. Ferulic acid esters of long-chain omega-hydroxyacids are prevalent in the partial depolymerisation products of suberin. Also, enzymes able to catalyze the feruloylation of omega-hydroxyacids were found timely-associated with the suberization process. It is proposed that ferulic acid, and its dimers, through esterification to omega-hydroxyacids, covalently link the suberin aliphatic polyester to suberin-associated polyaromatics. In this case, the known role of ferulates, and related hydroxycinnamates, as cross-linkers of structurally different polymers would be enlarged to suberized cell-walls.