This domain is found in Ribulose bisphosphate carboxylase/oxygenase activase from Nicotiana tabacum (RuBisCO activase) and similar proteins from plants and cyanobacteria. This enzyme facilitates the removal of the sugar phosphate inhibitors of RuBisCO, the enzyme that catalyses the fixation of atmospheric CO2 in photosynthesis. This protein is organised into an N-terminal, followed by a AAA module and a 23-residue C-terminal extension. The AAA module has an alpha-beta and an alpha-helical subdomains. This entry covers part of the alpha-beta subdomain and the C-terminal extension [1-4].

1: Structure of green-type Rubisco activase from tobacco. Stotz M, Mueller-Cajar O, Ciniawsky S, Wendler P, Hartl FU, Bracher A, Hayer-Hartl M; Nat Struct Mol Biol. 2011;18:1366-1370. PMID:22056769

2: Atomic resolution x-ray structure of the substrate recognition domain of higher plant ribulose-bisphosphate carboxylase/oxygenase (Rubisco) activase. Henderson JN, Kuriata AM, Fromme R, Salvucci ME, Wachter RM; J Biol Chem. 2011;286:35683-35688. PMID:21880724

3: Structure of Arabidopsis thaliana Rubisco activase. Hasse D, Larsson AM, Andersson I; Acta Crystallogr D Biol Crystallogr. 2015;71:800-808. PMID:25849391

4: Dual Functions of a Rubisco Activase in Metabolic Repair and Recruitment to Carboxysomes. Flecken M, Wang H, Popilka L, Hartl FU, Bracher A, Hayer-Hartl M; Cell. 2020;183:457-473. PMID:32979320