1bxn
From Proteopedia
(New page: 200px<br /><applet load="1bxn" size="450" color="white" frame="true" align="right" spinBox="true" caption="1bxn, resolution 2.70Å" /> '''THE CRYSTAL STRUCTUR...) |
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| - | [[Image:1bxn.jpg|left|200px]]<br /><applet load="1bxn" size=" | + | [[Image:1bxn.jpg|left|200px]]<br /><applet load="1bxn" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1bxn, resolution 2.70Å" /> | caption="1bxn, resolution 2.70Å" /> | ||
'''THE CRYSTAL STRUCTURE OF RUBISCO FROM ALCALIGENES EUTROPHUS TO 2.7 ANGSTROMS.'''<br /> | '''THE CRYSTAL STRUCTURE OF RUBISCO FROM ALCALIGENES EUTROPHUS TO 2.7 ANGSTROMS.'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) is involved in | + | Ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) is involved in photosynthesis where it catalyzes the initial step in the fixation of carbon dioxide. The enzyme also catalyzes a competing oxygenation reaction leading to loss of fixed carbon dioxide, thus reducing the net efficiency of photosynthesis significantly. Rubisco has therefore been studied extensively, and a challenging goal is the engineering of a more photosynthetically efficient enzyme. Hexadecameric rubiscos fall in two distinct groups, "green-like" and "red-like". The ability to discriminate between CO2 and O2 as substrates varies significantly, and some algae have red-like rubisco with even higher specificity for CO2 than the plant enzyme. The structure of unactivated rubisco from Alcaligenes eutrophus has been determined to 2.7 A resolution by molecular replacement and refined to R and Rfree values of 26.6 and 32.2 %, respectively. The overall fold of the protein is very similar to the rubisco structures solved previously for green-like hexadecameric enzymes, except for the extended C-terminal domains of the small subunits which together form an eight-stranded beta-barrel which sits as a plug in the entrance to the central solvent channel in the molecule. The present structure is the first which has been solved for a red-like rubisco and is likely to represent a fold which is common for this group. The small subunits in general are believed to have a stabilizing effect, and the new quaternary structure in the oligomer of the present structure is likely to contribute even more to this stabilization of the assembled rubisco protein. |
==About this Structure== | ==About this Structure== | ||
| - | 1BXN is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Cupriavidus_necator Cupriavidus necator] with PO4 as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Ribulose-bisphosphate_carboxylase Ribulose-bisphosphate carboxylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.39 4.1.1.39] Full crystallographic information is available from [http:// | + | 1BXN is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Cupriavidus_necator Cupriavidus necator] with <scene name='pdbligand=PO4:'>PO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Ribulose-bisphosphate_carboxylase Ribulose-bisphosphate carboxylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.39 4.1.1.39] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BXN OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Hansen, S.]] | [[Category: Hansen, S.]] | ||
[[Category: Hough, E.]] | [[Category: Hough, E.]] | ||
| - | [[Category: Vollan, V | + | [[Category: Vollan, V B.]] |
[[Category: PO4]] | [[Category: PO4]] | ||
[[Category: lyase (carbon-carbon)]] | [[Category: lyase (carbon-carbon)]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:00:18 2008'' |
Revision as of 10:00, 21 February 2008
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THE CRYSTAL STRUCTURE OF RUBISCO FROM ALCALIGENES EUTROPHUS TO 2.7 ANGSTROMS.
Overview
Ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) is involved in photosynthesis where it catalyzes the initial step in the fixation of carbon dioxide. The enzyme also catalyzes a competing oxygenation reaction leading to loss of fixed carbon dioxide, thus reducing the net efficiency of photosynthesis significantly. Rubisco has therefore been studied extensively, and a challenging goal is the engineering of a more photosynthetically efficient enzyme. Hexadecameric rubiscos fall in two distinct groups, "green-like" and "red-like". The ability to discriminate between CO2 and O2 as substrates varies significantly, and some algae have red-like rubisco with even higher specificity for CO2 than the plant enzyme. The structure of unactivated rubisco from Alcaligenes eutrophus has been determined to 2.7 A resolution by molecular replacement and refined to R and Rfree values of 26.6 and 32.2 %, respectively. The overall fold of the protein is very similar to the rubisco structures solved previously for green-like hexadecameric enzymes, except for the extended C-terminal domains of the small subunits which together form an eight-stranded beta-barrel which sits as a plug in the entrance to the central solvent channel in the molecule. The present structure is the first which has been solved for a red-like rubisco and is likely to represent a fold which is common for this group. The small subunits in general are believed to have a stabilizing effect, and the new quaternary structure in the oligomer of the present structure is likely to contribute even more to this stabilization of the assembled rubisco protein.
About this Structure
1BXN is a Protein complex structure of sequences from Cupriavidus necator with as ligand. Active as Ribulose-bisphosphate carboxylase, with EC number 4.1.1.39 Full crystallographic information is available from OCA.
Reference
The crystal structure of rubisco from Alcaligenes eutrophus reveals a novel central eight-stranded beta-barrel formed by beta-strands from four subunits., Hansen S, Vollan VB, Hough E, Andersen K, J Mol Biol. 1999 May 14;288(4):609-21. PMID:10329167
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