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首页> 外文期刊>Critical Reviews in Plant Sciences >Accumulated Evidence Substantiates a Role for Three Classes of Wheat Xylanase Inhibitors in Plant Defense
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Accumulated Evidence Substantiates a Role for Three Classes of Wheat Xylanase Inhibitors in Plant Defense

机译：积累的证据证实了三类小麦木聚糖酶抑制剂在植物防御中的作用

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摘要

Since their discovery in 1997, work on proteinaceous wheat xylanase inhibitors (XIs) led to the identification and thorough biochemical and structural characterization of three classes of XIs, namely TAXI-type (Triticum aestivum xylanase inhibitor), XIP-type (xylanase inhibiting protein), and TLXI-type (thaumatin-like xylanase inhibitor) XIs. Already early on, a role in plant defense has been put forward for these proteins, mainly based on the observation that these XIs are only active against xylanases of microbial origin and can not inhibit the plant endogenous xylanases known so far. Considerable effort has been devoted to substantiate this plant defense hypothesis. Data at the genomic, transcriptomic and proteomic levels increasingly provide evidence that XIs, occurring as large polymorphic families, do indeed participate in plant defense. This review summarizes the current knowledge on XIs and the accumulated evidence on their role in plant defense. TLXI and XIP can be classified as pathogenesis-related (PR) proteins of classes PR-5 and PR-8, respectively, based on their homology with thaumatin-like proteins and chitinases. For TAXI, more evidence on the induction of TAXI proteins by a pathogen in tissues that normally do not express TAXI is required before it can be categorized as a new class of PR proteins. At the moment, TAXI proteins should be referred to as inducible defense-related proteins.
机译：自从1997年发现以来，蛋白质小麦木聚糖酶抑制剂（XIs）的研究导致对三类XI的鉴定和全面的生化和结构表征，分别是TAXI型（普通小麦木聚糖酶抑制剂），XIP型（木聚糖酶抑制蛋白）。和TLXI型（索马甜蛋白样木聚糖酶抑制剂）XI。已经很早就提出了这些蛋白在植物防御中的作用，主要是基于以下观察：这些XI仅对微生物来源的木聚糖酶具有活性，并且不能抑制迄今为止已知的植物内源木聚糖酶。为了证实这种植物防御假说，人们付出了巨大的努力。基因组，转录组和蛋白质组学水平的数据越来越多地提供证据表明，作为大的多态性家族出现的XI确实参与了植物防御。这篇综述总结了有关XI的当前知识以及它们在植物防御中的作用的积累证据。 TLXI和XIP基于与奇异蛋白类似蛋白和几丁质酶的同源性，可分别归类为PR-5和PR-8类的致病相关（PR）蛋白。对于TAXI，需要更多证据证明病原体在通常不表达TAXI的组织中诱导TAXI蛋白，然后才能将其分类为一类新型PR蛋白。目前，TAXI蛋白应被称为诱导型防御相关蛋白。

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