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1RXO

ACTIVATED SPINACH RUBISCO IN COMPLEX WITH ITS SUBSTRATE RIBULOSE-1,5-BISPHOSPHATE AND CALCIUM

Summary for 1RXO
Entry DOI10.2210/pdb1rxo/pdb
DescriptorRIBULOSE BISPHOSPHATE CARBOXYLASE/OXYGENASE, RIBULOSE-1,5-DIPHOSPHATE, CALCIUM ION, ... (5 entities in total)
Functional Keywordslyase (carbon-carbon)
Biological sourceSpinacia oleracea (spinach)
More
Cellular locationPlastid, chloroplast: P00875 P00870
Total number of polymer chains8
Total formula weight271066.08
Authors
Taylor, T.C.,Andersson, I. (deposition date: 1996-12-06, release date: 1997-06-16, Last modification date: 2024-06-05)
Primary citationTaylor, T.C.,Andersson, I.
The structure of the complex between rubisco and its natural substrate ribulose 1,5-bisphosphate.
J.Mol.Biol., 265:432-444, 1997
Cited by
PubMed Abstract: The three-dimensional structure of the complex of ribulose 1,5-bisphosphate carboxylase/oxygenase (rubisco; EC 4.1.1.39) from spinach with its natural substrate ribulose 1,5-bisphosphate (RuBP) has been determined both under activating and non-activating conditions by X-ray crystallography to a resolution of 2.1 A and 2.4 A, respectively. Under activating conditions, the use of calcium instead of magnesium as the activator metal ion enabled us to trap the substrate in a stable complex for crystallographic analysis. Comparison of the structure of the activated and the non-activated RuBP complexes shows a tighter binding for the substrate in the non-activated form of the enzyme, in line with previous solution studies. In the non-activated complex, the substrate triggers isolation of the active site by inducing movements of flexible loop regions of the catalytic subunits. In contrast, in the activated complex the active site remains partly open, probably awaiting the binding of the gaseous substrate. By inspection of the structures and by comparison with other complexes of the enzyme we were able to identify a network of hydrogen bonds that stabilise a closed active site structure during crucial steps in the reaction. The present structure underlines the central role of the carbamylated lysine 201 in both activation and catalysis, and completes available structural information for our proposal on the mechanism of the enzyme.
PubMed: 9034362
DOI: 10.1006/jmbi.1996.0738
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (2.2 Å)
Structure validation

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