Molecular analysis and control of cysteine biosynthesis: integration of nitrogen and sulphur metabolism.

Abstract:

:Since cysteine is the first committed molecule in plant metabolism containing both sulphur and nitrogen, the regulation of its biosynthesis is critically important. Cysteine itself is required for the production of an abundance of key metabolites in diverse pathways. Plants alter their metabolism to compensate for sulphur and nitrogen deficiencies as best as they can, but limitations in either nutrient not only curb a plant's ability to synthesize cysteine, but also restrict protein synthesis. Nutrients such as nitrate and sulphate (and carbon) act as signals; they trigger molecular mechanisms that modify biosynthetic pathways and thereby have a profound impact on metabolite fluxes. Cysteine biosynthesis is modified by regulators acting at the site of uptake and throughout the plant system. Recent data point to the existence of nutrient-specific signal transduction pathways that relay information about external and internal nutrient concentrations, resulting in alterations to cysteine biosynthesis. Progress in this field has led to the cloning of genes that play pivotal roles in nutrient-induced changes in cysteine formation.

journal_name

J Exp Bot

authors

Hesse H,Nikiforova V,Gakière B,Hoefgen R

doi

10.1093/jxb/erh136

keywords:

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

1283-92

issue

401

eissn

0022-0957

issn

1460-2431

pii

erh136

journal_volume

55

pub_type

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