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The pathway of chlorophyll degradation: Catabolites, enzymes and pathway regulation


Hörtensteiner, Stefan (2013). The pathway of chlorophyll degradation: Catabolites, enzymes and pathway regulation. In: Biswal, B; Krupinska, K. Plastid Development in Leaves during Growth and Senescence. Dordrecht, The Netherlands: Springer Netherlands, 363-392.

Abstract

During leaf senescence and fruit ripening, chlorophyll is broken down to colorless linear tetrapyrroles, which are stored in the vacuoles of degreened cells. The pathway of chlorophyll degradation that is active in these developmental processes is fairly well known regarding its biochemistry and cell biology. It comprises at least six enzymatic and one non-enzymatic reaction and the chemical structures of several intermediary and final chlorophyll catabolites have been elucidated. In the last few years, genes coding for a number of chlorophyll catabolic enzymes have been characterized and mutants in these genes have been analyzed. This includes pheophorbide a oxygenase (PAO), the key enzyme of the pathway, which is responsible for opening of the chlorine macrocycle present in chlorophyll, thereby providing the characteristic structural basis of all further downstream breakdown products. The pathway is therefore nowadays termed the ‘PAO pathway’. This review summarizes information on the structures of chlorophyll breakdown products and the reactions involved in their formation. In addition cell biological and regulatory aspects of the PAO pathway are discussed.

Abstract

During leaf senescence and fruit ripening, chlorophyll is broken down to colorless linear tetrapyrroles, which are stored in the vacuoles of degreened cells. The pathway of chlorophyll degradation that is active in these developmental processes is fairly well known regarding its biochemistry and cell biology. It comprises at least six enzymatic and one non-enzymatic reaction and the chemical structures of several intermediary and final chlorophyll catabolites have been elucidated. In the last few years, genes coding for a number of chlorophyll catabolic enzymes have been characterized and mutants in these genes have been analyzed. This includes pheophorbide a oxygenase (PAO), the key enzyme of the pathway, which is responsible for opening of the chlorine macrocycle present in chlorophyll, thereby providing the characteristic structural basis of all further downstream breakdown products. The pathway is therefore nowadays termed the ‘PAO pathway’. This review summarizes information on the structures of chlorophyll breakdown products and the reactions involved in their formation. In addition cell biological and regulatory aspects of the PAO pathway are discussed.

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Additional indexing

Item Type:Book Section, refereed, further contribution
Communities & Collections:07 Faculty of Science > Department of Plant and Microbial Biology
Dewey Decimal Classification:580 Plants (Botany)
Language:English
Date:2013
Deposited On:10 Jan 2014 08:20
Last Modified:05 Apr 2016 17:21
Publisher:Springer Netherlands
Series Name:Advances in Photosynthesis and Respiration
Number:36
ISSN:1572-0233
ISBN:978-94-007-5723-3
Publisher DOI:https://doi.org/10.1007/978-94-007-5724-0_16

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