CurT/CURT1 proteins are involved in cell and chloroplast division coordination of cyanobacteria and green algae

Marcel Dann (), Eunchul Kim (), Konomi Fujimura-Kamada, Vjosa Berisha, Mami Nomura, Anne-Christin Pohland, Mai Watanabe, Matthias Ostermeier, Frederik Sommer, Michael Schroda, Shin-ya Miyagishima and Jun Minagawa
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Marcel Dann: Technical University of Darmstadt
Eunchul Kim: National Institute for Basic Biology
Konomi Fujimura-Kamada: National Institute for Basic Biology
Vjosa Berisha: Technical University of Darmstadt
Mami Nomura: Yamagata University
Anne-Christin Pohland: Technical University of Darmstadt
Mai Watanabe: Technical University of Darmstadt
Matthias Ostermeier: Ludwig-Maximilians University Munich
Frederik Sommer: RPTU Kaiserslautern-Landau
Michael Schroda: RPTU Kaiserslautern-Landau
Shin-ya Miyagishima: National Institute of Genetics Japan
Jun Minagawa: National Institute for Basic Biology

Nature Communications, 2025, vol. 16, issue 1, 1-21

Abstract: Abstract Plant proteins of the CURVATURE THYLAKOID 1 (CURT1) family and their prokaryotic CurT homologues are key determinants of the three-dimensional structure of the thylakoid membrane systems in chloroplasts and cyanobacteria. As the evolutionary origin of the CURT1/CurT family appears to coincide with the evolution of thylakoids themselves, shaping the thylakoid system has widely been regarded as their primary role. In this study we present strong evidence that CurT, beyond regulation of thylakoid architecture, is involved in cell division and thylakoid fission/partitioning in both Synechocystis sp. PCC 6803 and Synechococcus elongatus PCC 7942, likely through physical interaction with the key cell division protein FtsZ. Similarly, triple mutants of Chlamydomonas reinhardtii CURT1A, B, and C display an asymmetric chloroplast division phenotype, thus suggesting an evolutionary conserved functionality of CurT/CURT1 in cell/chloroplast division in single-celled oxygenic photosynthesizers.

Date: 2025
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DOI: 10.1038/s41467-025-64163-x

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