McGurl B, Pearce G, Ryan C A
Institute of Biological Chemistry, Washington State University, Pullman 99164-6340, USA.
Biochem Soc Symp. 1994;60:149-54.
The synthesis of proteinase inhibitor proteins in response to wounding is a defensive response against pest and pathogen attacks. Wounding of leaves results in the release of a mobile wound signal which induces proteinase inhibitor synthesis throughout the plant. The signal transduction pathway regulating this response is not fully understood, but several compounds have been identified which are capable of inducing proteinase inhibitor synthesis in tomato and potato leaves. These compounds include cell wall fragments of both plant and pathogen origin [1-3], abscisic acid [4], jasmonic acid [5] and, most recently, an 18-amino-acid polypeptide, called systemin, isolated from tomato leaves [6]. In this chapter, we describe the properties of systemin and its precursor prosystemin, and we summarize the evidence supporting a role for systemin as an initial signal that regulates proteinase inhibitor synthesis in response to wounding.
响应创伤而合成蛋白酶抑制蛋白是植物抵御害虫和病原体侵袭的一种防御反应。叶片受到创伤会导致一种可移动的创伤信号释放，该信号会诱导整株植物合成蛋白酶抑制剂。调节这种反应的信号转导途径尚未完全明确，但已鉴定出几种能够在番茄和马铃薯叶片中诱导蛋白酶抑制剂合成的化合物。这些化合物包括植物和病原体来源的细胞壁片段[1 - 3]、脱落酸[4]、茉莉酸[5]，以及最近从番茄叶片中分离出的一种18个氨基酸的多肽——系统素[6]。在本章中，我们描述了系统素及其前体前系统素的特性，并总结了支持系统素作为调节创伤诱导蛋白酶抑制剂合成的初始信号的证据。
