1ha7: Difference between revisions
New page: left|200px<br /><applet load="1ha7" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ha7, resolution 2.20Å" /> '''STRUCTURE OF A LIGHT... |
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[[Image:1ha7.gif|left|200px]]<br /><applet load="1ha7" size=" | [[Image:1ha7.gif|left|200px]]<br /><applet load="1ha7" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1ha7, resolution 2.20Å" /> | caption="1ha7, resolution 2.20Å" /> | ||
'''STRUCTURE OF A LIGHT-HARVESTING PHYCOBILIPROTEIN, C-PHYCOCYANIN FROM SPIRULINA PLATENSIS AT 2.2A RESOLUTION'''<br /> | '''STRUCTURE OF A LIGHT-HARVESTING PHYCOBILIPROTEIN, C-PHYCOCYANIN FROM SPIRULINA PLATENSIS AT 2.2A RESOLUTION'''<br /> | ||
==Overview== | ==Overview== | ||
The crystal structure of C-phycocyanin, a light-harvesting | The crystal structure of C-phycocyanin, a light-harvesting phycobiliprotein from cyanobacteria (blue-green algae) Spirulina platensis has been solved by molecular replacement technique. The crystals belong to space group P2(1) with cell parameters a = 107.20, b = 115.40, c = 183.04 A; beta = 90.2 degrees. The structure has been refined to a crystallographic R factor of 19.2% (R(free) = 23.9%) using the X-ray diffraction data extending up to 2.2 A resolution. The asymmetric unit of the crystal cell consists of two (alphabeta)6-hexamers, each hexamer being the functional unit in the native antenna rod of cyanobacteria. The molecular structure resembles that of other reported C-phycocyanins. However, the unique form of aggregation of two (alphabeta)6-hexamers in the crystal asymmetric unit, suggests additional pathways of energy transfer in lateral direction between the adjacent hexamers involving beta155 phycocyanobilin chromophores. | ||
==About this Structure== | ==About this Structure== | ||
1HA7 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Arthrospira_platensis Arthrospira platensis] with CYC as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | 1HA7 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Arthrospira_platensis Arthrospira platensis] with <scene name='pdbligand=CYC:'>CYC</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HA7 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Arthrospira platensis]] | [[Category: Arthrospira platensis]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Padyana, A | [[Category: Padyana, A K.]] | ||
[[Category: Rajashankar, K | [[Category: Rajashankar, K R.]] | ||
[[Category: Ramakumar, S.]] | [[Category: Ramakumar, S.]] | ||
[[Category: CYC]] | [[Category: CYC]] | ||
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[[Category: pigment protein]] | [[Category: pigment protein]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:59:08 2008'' | ||
Revision as of 10:59, 21 February 2008
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STRUCTURE OF A LIGHT-HARVESTING PHYCOBILIPROTEIN, C-PHYCOCYANIN FROM SPIRULINA PLATENSIS AT 2.2A RESOLUTION
Overview
The crystal structure of C-phycocyanin, a light-harvesting phycobiliprotein from cyanobacteria (blue-green algae) Spirulina platensis has been solved by molecular replacement technique. The crystals belong to space group P2(1) with cell parameters a = 107.20, b = 115.40, c = 183.04 A; beta = 90.2 degrees. The structure has been refined to a crystallographic R factor of 19.2% (R(free) = 23.9%) using the X-ray diffraction data extending up to 2.2 A resolution. The asymmetric unit of the crystal cell consists of two (alphabeta)6-hexamers, each hexamer being the functional unit in the native antenna rod of cyanobacteria. The molecular structure resembles that of other reported C-phycocyanins. However, the unique form of aggregation of two (alphabeta)6-hexamers in the crystal asymmetric unit, suggests additional pathways of energy transfer in lateral direction between the adjacent hexamers involving beta155 phycocyanobilin chromophores.
About this Structure
1HA7 is a Protein complex structure of sequences from Arthrospira platensis with CYC as ligand. Full crystallographic information is available from OCA.
Reference
Crystal structure of a light-harvesting protein C-phycocyanin from Spirulina platensis., Padyana AK, Bhat VB, Madyastha KM, Rajashankar KR, Ramakumar S, Biochem Biophys Res Commun. 2001 Apr 13;282(4):893-8. PMID:11352634
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