Photosynthetica 2022, 60(2):212-218 | DOI: 10.32615/ps.2022.004

Chloroplast protease/chaperone AtDeg2 holds γ1 subunit of ATP synthase in an unaggregated state under high irradiance conditions in Arabidopsis thaliana

P. JAGODZIK, G. JACKOWSKI
Department of Plant Physiology, Institute of Experimental Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614 Poznań, Poland

Little data on the role played in vivo by chloroplast protein AtDeg2 as a chaperone is available. Therefore, we sought for chloroplast proteins protected from high irradiance-induced interprotein aggregation via disulphide bridges by AtDeg2 acting as a holdase. To reach this goal, we performed analyses which involved comparative diagonal electrophoreses of lysates of chloroplasts isolated from wild type (WT) plants and transgenic plants 35S:AtDEG2ΔPDZ1-GFP which expressed AtDeg2 lacking its chaperone activity but retaining the protease activity. The results of the analyses indicate that AtDeg2 acting as a holdase prevents a single chloroplast protein, i.e., the γ1 subunit of ATP synthase from long-term high irradiance-induced homodimerization mediated by disuplhide bridges and this allows us to better understand a complexity of physiological significance of AtDeg2 - the chloroplast protein of dual protease/chaperone activity.

Additional key words: chaperone; Deg2; elevated irradiance; homodimerization; protease.

Received: July 7, 2021; Revised: December 30, 2021; Accepted: January 13, 2022; Prepublished online: February 15, 2022; Published: May 2, 2022  Show citation

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JAGODZIK, P., & JACKOWSKI, G. (2022). Chloroplast protease/chaperone AtDeg2 holds γ1 subunit of ATP synthase in an unaggregated state under high irradiance conditions in Arabidopsis thaliana . Photosynthetica, 60(2), 212-218. doi: 10.32615/ps.2022.004
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