Plant molybdoenzymes and their response to stress

被引:0
作者
Edyta Zdunek-Zastocka
Herman S. Lips
机构
[1] Warsaw Agricultural University,Department of Biochemistry
[2] Ben-Gurion University of the Negev,Biostress Research Laboratory, J. Blaustein Institute for Desert Research and Department of Life Sciences
来源
Acta Physiologiae Plantarum | 2003年 / 25卷
关键词
Abscisic acid; ABA; aldehyde oxidase; AO; ammonium; nitrate reductase; NR; stress conditions; salinity; sulphite oxidase; SO; xanthine dehydrogenase; XDH;
D O I
暂无
中图分类号
学科分类号
摘要
Molybdenum-containing enzymes catalyse basic reactions in the nitrogen, sulphur and carbon metabolism. Mo-enzymes contain at their catalytic sites an organometallic structure termed the molybdenum cofactor or Moco. In higher plants, Moco is incorporated into the apoproteins of four enzymes: nitrate reductase (EC 1.6.6.1-3; NR), xanthine dehydrogenase (EC 1.1.1.204; XDH), aldehyde oxidase (EC 1.2.3.1; AO) and sulphite oxidase (EC1.8.3.1; SO). Molybdoenzymes in plants are key enzymes in nitrate assimilation, purine metabolism, hormone biosynthesis, and most probably in sulphite detoxification. They are considered to be involved in stress acclimation processes and, therefore, elucidation of the mechanisms of their response to environmental stress conditions is of agricultural importance for the improvement of plant stress tolerance. Here we would like to give a brief functional and biochemical characteristic of the four plant molybdoenzymes and to focus mainly on their sensitivity to environmental stress factors.
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页码:437 / 452
页数:15
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