STRESS CONDITIONS APPLIED TO THE INTERPRETATION OF TRANSLATION MACHINERY

Smól, Joanna and Astriab, M. and DUDZIŃSKA-MADEJ, Beata and Twardowski, T. (2001) STRESS CONDITIONS APPLIED TO THE INTERPRETATION OF TRANSLATION MACHINERY. Acta Biologica Hungarica, 52 (1). pp. 161-170. ISSN 0236-5383

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Abstract

Gene expression is regulated at the critical steps: a regulatory event occurs at the step which has a criti- cal effect and is responsible for the limiting rate. Enzyme activity can be regulated at several different levels: transcriptional, translational or post-translational. In this review we describe (and illustrate with experimental data) plant stress which induces regulatory mechanisms at the translational and post-trans- lational levels. We found evidence for autorepression regulatory system of ferritin biosynthesis. Based on the knowl- edge of the molecular mechanism of regulation, we believe that ferritin protects the environment against heavy metal ions and supplements biological system(s) with iron. The quinolizidine alkaloids™ (QA) biosynthesis is lysine decarboxylase (LDC)-dependent. The avail- able pool of LDC limits the conversion of lysine to cadaverine. The amount of LDC depends on tran- scriptional and translational efficiency. However, in the light of the presented data, we have evidence for a post-translational regulatory system, i.e. the activation of LDC from low to high activity enzyme through the conversion from higher to lower molecular weight form. The plant protection system is very efficient. Understanding of the defence systems such as plant response to stress, should provide us with a possibility of applying this knowledge in practice and find- ing novel applications.

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