DOI: 10.1111/j.1399-3054.2004.00415.x. Role of histidines in the binding of violaxanthin de‐epoxidase to the thylakoid membrane as studied by site‐directed mutagenesis

Role of histidines in the binding of violaxanthin de‐epoxidase to the thylakoid membrane as studied by site‐directed mutagenesis

10.1111/j.1399-3054.2004.00415.x

Crossref journal-article

Wiley

Physiologia Plantarum (311)

Abstract

Regulation of violaxanthin de‐epoxidase (VDE) involves a conformational change at low lumenal pH, followed by binding of the enzyme to the thylakoid membrane. The role of histidine residues in this process was studied by release of unbound enzyme from thylakoids upon sonication, on a pH scale from 4.7 to 7.1. The co‐operativity for binding of spinach VDE (four histidines) to the membrane was found to be 3.8, with respect to protons, and had an inflexion point at pH 6.6, whereas VDE from wheat (three histidines) showed a co‐operativity of 2.9 and had an inflexion point at pH 6.2. Mutant forms of VDE were constructed and probed for their binding to the outside of thylakoid membranes. With one or two histidines substituted for alanine or arginine, a lower co‐operativity (1.6–2.3) was found, compared with the wild type. Based on these findings, and that the pKa value for histidine is within the range where the VDE binding takes place, we propose that protonation of the histidine residues at low pH induces the conformational change of VDE, and hence indirectly regulates binding of the enzyme to the thylakoid membrane.

Bibliography

Gisselsson, A., SzilÃ¡gyi, A., & Ãkerlund, H. (2004). Role of histidines in the binding of violaxanthin deâepoxidase to the thylakoid membrane as studied by siteâdirected mutagenesis. Physiologia Plantarum, 122(3), 337â343. Portico.

Authors 3

Anna Gisselsson (first)
Anna Szilágyi (additional)
Hans‐Erik Åkerlund (additional)

References 20 Referenced 23

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Dates

Type	When
Created	20 years, 10 months ago (Oct. 12, 2004, 12:02 p.m.)
Deposited	1 year, 10 months ago (Oct. 9, 2023, 11:28 p.m.)
Indexed	2 months, 2 weeks ago (June 11, 2025, 2:02 a.m.)
Issued	20 years, 10 months ago (Oct. 12, 2004)
Published	20 years, 10 months ago (Oct. 12, 2004)
Published Online	20 years, 10 months ago (Oct. 12, 2004)
Published Print	20 years, 9 months ago (Nov. 1, 2004)

Funders 0

None

BibTeX

@article{Gisselsson_2004, title={Role of histidines in the binding of violaxanthin de‐epoxidase to the thylakoid membrane as studied by site‐directed mutagenesis}, volume={122}, ISSN={1399-3054}, url={http://dx.doi.org/10.1111/j.1399-3054.2004.00415.x}, DOI={10.1111/j.1399-3054.2004.00415.x}, number={3}, journal={Physiologia Plantarum}, publisher={Wiley}, author={Gisselsson, Anna and Szilágyi, Anna and Åkerlund, Hans‐Erik}, year={2004}, month=oct, pages={337–343} }

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