Plant molybdoenzymes and their response to stress |
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Authors: | Email author" target="_blank">Edyta?Zdunek-ZastockaEmail author Herman?S?Lips |
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Institution: | (1) Department of Biochemistry, Warsaw Agricultural University, 02-528 Warszawa, Poland;(2) Biostress Research Laboratory, J. Blaustein Institute for Desert Research and Department of Life Sciences, Ben-Gurion University of the Negev, 84990 Sede-Boqer, Israel |
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Abstract: | 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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Keywords: | Abscisic acid ABA aldehyde oxidase AO ammonium nitrate reductase NR stress conditions salinity sulphite oxidase SO xanthine dehydrogenase XDH |
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