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Despite slow catalysis and confused substrate specificity, all ribulose bisphosphate carboxylases may be nearly perfectly optimized.
TLDR
It is asserted that all Rubiscos may be nearly perfectly adapted to the differing CO(2, O(2), and thermal conditions in their subcellular environments, optimizing this compromise between CO( 2)/O(2) specificity and the maximum rate of catalytic turnover.
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The kinetics of ribulose-1,5-bisphosphate carboxylase/oxygenase in vivo inferred from measurements of photosynthesis in leaves of transgenic tobacco
TLDR
Transgenic tobacco with an antisense gene directed against the mRNA of the ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) small subunit was used to determine the kinetic properties of Rubisco in vivo, and Rubisco's relative specificity for CO2 was estimated to be 97.5 in vivo.
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Mechanism of Rubisco: The Carbamate as General Base.
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The transition between the open and closed states of rubisco is triggered by the inter-phosphate distance of the bound bisphosphate.
TLDR
The crystal structure of unactivated (metal-free) rubisco from tobacco with only inorganic phosphate bound is solved and it is concluded that phosphate binding per se does not trigger closure, as it does in the similarly structured enzyme, triosephosphate isomerase.
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Correlations between oxygen isotope ratios of wood constituents of Quercus and Pinus samples from around the world
TLDR
The oxygen isotope compositions of three wood constituents were measured for samples collected from Quercus and Pinus trees around the world and support the hypothesis that many oxygen atoms in lignin exchanged with unenriched stem water during synthesis, rather than retaining the full isotopic signal from the molecular oxygen added during hydroxylation of the aromatic ring.
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Faster Rubisco Is the Key to Superior Nitrogen-Use Efficiency in NADP-Malic Enzyme Relative to NAD-Malic Enzyme C4 Grasses1
TLDR
In conclusion, superior N-use efficiency of NADP-ME relative to NAD-ME grasses was achieved with less leaf N, soluble protein, and Rubisco having a faster kcat.
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The activation of ribulose-1,5-bisphosphate carboxylase by carbon dioxide and magnesium ions. Equilibria, kinetics, a suggested mechanism, and physiological implications.
TLDR
Kinetic analyses indicated that CO2 reacted with an enzyme group whose pK was distinctly alkaline, indicating that the activation of ribulose-1, 5-biphosphate carboxylane involves the formation of a carbamate.
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Photosynthetic electron sinks in transgenic tobacco with reduced amounts of Rubisco: little evidence for significant Mehler reaction.
TLDR
It is concluded that although there may be some electron transport to O2 to balance conflicting demands of NADPH to ATP requirements, this flux must decrease in proportion with the reduced demand for ATP and NADPH consumption in the transgenic lines.
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Reduction of ribulose-1,5-bisphosphate carboxylase/oxygenase content by antisense RNA reduces photosynthesis in transgenic tobacco plants.
TLDR
Results suggest that stomatal function is independent of total leaf Rubisco activity and that carbon isotope discrimination in the leaves of the antisense plants is greater than in control leaves.
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Photosynthesis and Inorganic Carbon Usage by the Marine Cyanobacterium, Synechococcus sp.
TLDR
Experimental approaches to the question of whether CO(2) or HCO(3) (-) is primarily utilized by the inorganic carbon transport system in these cells show that in fact both species are capable of acting as substrate, andCO(2), however, is more readily taken up when provided at an equivalent concentration to HCO(-) (-).
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