Redox‐control of chlorophyll biosynthesis mainly depends on thioredoxins

In order to maintain enzyme stability and activity, chloroplasts use two systems of thiol‐disulfide reductases for the control of redox‐dependent properties of proteins. Previous studies have revealed that plastid‐localized thioredoxins (TRX) and the NADPH‐dependent thioredoxin reductase C (NTRC) ar...

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Bibliographic Details
Published in:FEBS letters 2018-09, Vol.592 (18), p.3111-3115
Main Authors: Richter, Andreas S., Pérez‐Ruiz, Juan M., Cejudo, Francisco Javier, Grimm, Bernhard
Format: Article
Language:English
Subjects:
NADPH‐dependent thioredoxin reductase C
redox‐regulation
tetrapyrrole biosynthesis
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Summary:In order to maintain enzyme stability and activity, chloroplasts use two systems of thiol‐disulfide reductases for the control of redox‐dependent properties of proteins. Previous studies have revealed that plastid‐localized thioredoxins (TRX) and the NADPH‐dependent thioredoxin reductase C (NTRC) are important for the reduction of cysteine residues of enzymes involved in chlorophyll synthesis. Very recently, it was shown that the pale green phenotype of the ntrc mutant is suppressed when the contents of 2‐cysteine peroxiredoxins (2CP) A and B are decreased. Here, we show that suppression of the ntrc phenotype results from a recovery of wild‐type‐like redox control of chlorophyll biosynthesis enzymes in ntrc/2cp mutants. The presented results support the conclusion that TRXs rather than NTRC are the predominant reductases mediating the redox‐regulation of these enzymes.
ISSN:0014-5793
1873-3468
DOI:10.1002/1873-3468.13216