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| | {{STRUCTURE_1i7y| PDB=1i7y | SCENE= }} | | {{STRUCTURE_1i7y| PDB=1i7y | SCENE= }} |
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| - | '''CRYSTAL STRUCTURE OF C-PHYCOCYANIN OF SYNECHOCOCCUS VULCANUS AT 2.5 ANGSTROMS.'''
| + | ===CRYSTAL STRUCTURE OF C-PHYCOCYANIN OF SYNECHOCOCCUS VULCANUS AT 2.5 ANGSTROMS.=== |
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| - | ==Overview==
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| - | The crystal structure of the light-harvesting phycobiliprotein, c-phycocyanin from the thermophilic cyanobacterium Synechochoccus vulcanus has been determined by molecular replacement to 2.5 A resolution. The crystal belongs to space group R32 with cell parameters a=b=188.43 A, c=61.28 A, alpha=beta=90 degrees, gamma=120 degrees, with one (alphabeta) monomer in the asymmetric unit. The structure has been refined to a crystallographic R factor of 20.2 % (R-free factor is 24.4 %), for all data to 2.5 A. The crystals were grown from phycocyanin (alphabeta)(3) trimers that form (alphabeta)(6) hexamers in the crystals, in a fashion similar to other phycocyanins. Comparison of the primary, tertiary and quaternary structures of the S. vulcanus phycocyanin structure with phycocyanins from both the mesophilic Fremyella diplsiphon and the thermophilic Mastigocladus laminosus were performed. We show that each level of assembly of oligomeric phycocyanin, which leads to the formation of the phycobilisome structure, can be stabilized in thermophilic organisms by amino acid residue substitutions. Each substitution can form additional ionic interactions at critical positions of each association interface. In addition, a significant shift in the position of ring D of the B155 phycocyanobilin cofactor in the S. vulcanus phycocyanin, enables the formation of important polar interactions at both the (alphabeta) monomer and (alphabeta)(6) hexamer association interfaces.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_11601847}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 11601847 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_11601847}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Photosystem ii]] | | [[Category: Photosystem ii]] |
| | [[Category: Thermostability]] | | [[Category: Thermostability]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:41:11 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:33:29 2008'' |
Revision as of 07:33, 1 July 2008
Template:STRUCTURE 1i7y
CRYSTAL STRUCTURE OF C-PHYCOCYANIN OF SYNECHOCOCCUS VULCANUS AT 2.5 ANGSTROMS.
Template:ABSTRACT PUBMED 11601847
About this Structure
1I7Y is a Protein complex structure of sequences from Thermosynechococcus vulcanus. Full crystallographic information is available from OCA.
Reference
Structure of c-phycocyanin from the thermophilic cyanobacterium Synechococcus vulcanus at 2.5 A: structural implications for thermal stability in phycobilisome assembly., Adir N, Dobrovetsky Y, Lerner N, J Mol Biol. 2001 Oct 12;313(1):71-81. PMID:11601847
Page seeded by OCA on Tue Jul 1 10:33:29 2008
