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3 papers 100 to 500 followers
Michelle J Blayney, Spencer M Whitney, Jennifer L Beck
Ribulose bisphosphate carboxylase/oxygenase (Rubisco) is the protein that is responsible for the fixation of carbon dioxide in photosynthesis. Inhibitory sugar phosphate molecules, which can include its substrate ribulose-1,5-bisphosphate (RuBP), can bind to Rubisco catalytic sites and inhibit catalysis. These are removed by interaction with Rubisco activase (RA) via an ATP hydrolytic reaction. Here we show the first nanoESI mass spectra of the hexadecameric Rubisco and of RA from a higher plant (tobacco). The spectra of recombinant, purified RA revealed polydispersity in its oligomeric forms (up to hexamer) and that ADP was bound...
September 2011: Journal of the American Society for Mass Spectrometry
Michiel van Lun, Jochen S Hub, David van der Spoel, Inger Andersson
Protein-gas interactions are important in biology. The enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) catalyzes two competing reactions involving CO2 and O2 as substrates. Carboxylation of the common substrate ribulose-1,5-bisphosphate leads to photosynthetic carbon assimilation, while the oxygenation reaction competes with carboxylation and reduces photosynthetic productivity. The migration of the two gases in and around Rubisco was investigated using molecular dynamics simulations. The results indicate that at equal concentrations of the gases, Rubisco binds CO2 stronger than it does O2...
February 26, 2014: Journal of the American Chemical Society
Boguslaw Stec
Ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is a crucial enzyme in carbon fixation and the most abundant protein on earth. It has been studied extensively by biochemical and structural methods; however, the most essential activation step has not yet been described. Here, we describe the mechanistic details of Lys carbamylation that leads to RuBisCO activation by atmospheric CO(2). We report two crystal structures of nitrosylated RuBisCO from the red algae Galdieria sulphuraria with O(2) and CO(2) bound at the active site...
November 13, 2012: Proceedings of the National Academy of Sciences of the United States of America
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