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Title: PEROXIREDOXIN Q stimulates the activity of the chloroplast 16:1 Δ3trans FATTY ACID DESATURASE4

Journal Article · · The Plant Journal
DOI: https://doi.org/10.1111/tpj.14657 · OSTI ID:1596397
ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [4]
  1. Department of Energy‐Plant Research Laboratory Michigan State University East Lansing MI 48824 USA
  2. Department of Energy‐Plant Research Laboratory Michigan State University East Lansing MI 48824 USA, Department of Chemical Engineering and Materials Science Michigan State University East Lansing MI 48824 USA
  3. Department of Energy‐Plant Research Laboratory Michigan State University East Lansing MI 48824 USA, Department of Biochemistry and Molecular Biology Michigan State University East Lansing MI 48824 USA
  4. Department of Energy‐Plant Research Laboratory Michigan State University East Lansing MI 48824 USA, Department of Biochemistry and Molecular Biology Michigan State University East Lansing MI 48824 USA, Department of Plant Biology Michigan State University East Lansing MI 48824 USA

Summary Thylakoid membrane lipids, comprised of glycolipids and the phospholipid phosphatidylglycerol (PG), are essential for normal plant growth and development. Unlike other lipid classes, chloroplast PG in nearly all plants contains a substantial fraction of the unusual trans fatty acid 16:1 Δ3trans or 16:1t. We determined that, in Arabidopsis thaliana , 16:1t biosynthesis requires both FATTY ACID DESATURASE4 (FAD4) and a thylakoid‐associated redox protein, PEROXIREDOXIN Q (PRXQ), to produce wild‐type levels of 16:1t. The FAD4–PRXQ biochemical relationship appears to be very specific in planta , as other fatty acids (FA) desaturases do not require peroxiredoxins for their activity, nor does FAD4 require other chloroplast peroxiredoxins under standard growth conditions. Although most of chloroplast PG assembly occurs at the inner envelope membrane, FAD4 was primarily associated with the thylakoid membranes facing the stroma. Furthermore, co‐production of PRXQ with FAD4 was required to produce Δ3‐desaturated FAs in yeast. Alteration of the redox state of FAD4 or PRXQ through site‐directed mutagenesis of conserved cysteine residues impaired Δ3 FA production. However, these mutations did not appear to directly alter disulfide status of FAD4. These results collectively demonstrate that the production of 16:1t is linked to the redox status of the chloroplast through PRXQ associated with the thylakoids.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐FG02‐91ER20021; DE‐FG02‐98ER20305
OSTI ID:
1596397
Journal Information:
The Plant Journal, Journal Name: The Plant Journal Vol. 102 Journal Issue: 4; ISSN 0960-7412
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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