Sökning: WFRF:(Gough M)
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Chlorophyll biosynt...
Chlorophyll biosynthesis in higher plants. Regulatory aspects of 5-aminolevulinate formation
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- Gough, Simon (författare)
- Lund University,Lunds universitet,Biokemi och Strukturbiologi,Centrum för Molekylär Proteinvetenskap,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Biochemistry and Structural Biology,Center for Molecular Protein Science,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Westergren, Tomas (författare)
- Lund University,Lunds universitet,Avdelningen för mikrobiologi, immunologi och glykobiologi - MIG,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Microbiology, Immunology and Glycobiology - MIG,Department of Laboratory Medicine,Faculty of Medicine
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Hansson, M (författare)
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(creator_code:org_t)
- 2003
- 2003
- Engelska.
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Ingår i: Journal of Plant Biology. - 1226-9239. ; 46:3, s. 135-160
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Abstract
Ämnesord
Stäng
- Chlorophyll, heme, phytochrome and siroheme biosynthesis in higher plants is regulated by the supply of their precursor 5-aminolevulinate (ALA), which is derived from glutamate. Glutamate conversion to ALA occurs only in the plastid and requires chloroplast coded tRNA(Glu) and nuclear coded glutamyl-tRNA synthetase, glutamyl-tRNA reductase and glutamate 1-semialdehyde aminotransferase. The chromosomal location in Arabidopsis thaliana, rice and barley of these factors are presented with UniGene data for cDNA tissue locations. Similarly also for other nuclear gene products affecting ALA formation: sigma factor sigB; the A. thaliana Flu and monocot (figrina-d) homologs; xi-carotene desaturase, lycopene synthase and carotenoid isomerase. Cytokinin is a positive regulator of tRNA(Glu) amounts, which correlate with ALA formation. SigB is required for tRNA(Glu) transcription. Phytochrome A, cryptochrome and Mg-proto-porphyrin repress transcription of glutamyl-tRNA reductase in the dark, which is de-repressed by red and blue light. Post-transcriptional control is little understood but may in Poaceae involve messages stabilised by 5'UTR stem-loops. The reductase is inhibited by heme. The Mg-branch has its own inhibitor, A thaliana Flu, encoding a membrane protein, recently found to be identical to barley Tigrina-d. It interacts with glutamyl-tRNA reductase through TPR domains mediating Mg-protoporphyrin inhibition. Carotenoid deficient regulatory tigrina or their phenocopies point to membranes as a regulatory site or to abscisic acid as a negative regulator.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- glutamyl-tRNA reductase
- glutamyl-tRNA
- abscisic
- cytokinin
- Mg-protoporphyrin
- heme
Publikations- och innehållstyp
- for (ämneskategori)
- ref (ämneskategori)
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