Phylogenetic diversity of light-dependent phosphorylation of Thr78 in Rubisco activase

Bhatnagar, Nikita; Chung, Sarah S.; Hodge, John; Kim, Sang Yeol; Sands, Mia; Leakey, Andrew D. B.; Ort, Donald R.; Burgess, Steven J.

doi:10.1093/jxb/eraf266

Title: Phylogenetic diversity of light-dependent phosphorylation of Thr78 in Rubisco activase

Journal Article · Wed Jul 09 00:00:00 UTC 2025 · Journal of Experimental Botany

DOI: https://doi.org/10.1093/jxb/eraf266 · OSTI ID:2574779

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^[1]; Kim, Sang Yeol ^[1];

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University of Illinois Urbana-Champaign, IL (United States)

Rubisco activase is an ATP-dependent chaperone that facilitates dissociation of inhibitory sugar phosphates from the catalytic sites of Rubisco during photosynthesis. In Arabidopsis, Rubisco activase is negatively regulated by dark-dependent phosphorylation of Thr78. The prevalence of Thr78 in Rubisco activase was investigated across sequences from 91 plant species, finding that 29 (∼32%) species shared a threonine in the same position. Analysis of seven C3 species with an antibody raised against a Thr78 phospho-peptide demonstrated that this position is phosphorylated in multiple genera. However, light-dependent dephosphorylation of Thr78 was observed only in Arabidopsis. Further, phosphorylation of Thr78 could not be detected in any of the four C4 grass species examined. The results suggest that despite conservation of Thr78 in Rubisco activase from a wide range of species, a regulatory role for phosphorylation at this site is more limited. Furthermore, this provides a case study for how variation in post-translational regulation can amplify functional divergence across the phylogeny of plants beyond what is explained by sequence variation in a metabolically important protein.

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Research Organization:: University of Illinois Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0018420

OSTI ID:: 2574779

Journal Information:: Journal of Experimental Botany, Journal Name: Journal of Experimental Botany; ISSN 1460-2431; ISSN 0022-0957

Publisher:: Oxford University Press - Society for Experimental BiologyCopyright Statement

Country of Publication:: United States

Language:: English

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