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[[Image:1kn1.gif|left|200px]]
{{Seed}}
[[Image:1kn1.png|left|200px]]


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{{STRUCTURE_1kn1|  PDB=1kn1  |  SCENE=  }}  
{{STRUCTURE_1kn1|  PDB=1kn1  |  SCENE=  }}  


'''Crystal structure of allophycocyanin'''
===Crystal structure of allophycocyanin===




==Overview==
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The crystal structure of allophycocyanin from red algae Porphyra yezoensis (APC-PY) at 2.2-A resolution has been determined by the molecular replacement method. The crystal belongs to space group R32 with cell parameters a = b = 105.3 A, c = 189.4 A, alpha = beta = 90 degrees, gamma = 120 degrees. After several cycles of refinement using program X-PLOR and model building based on the electron density map, the crystallographic R-factor converged to 19.3% (R-free factor is 26.9%) in the range of 10.0 to 2.2 A. The r.m.s. deviations of bond length and angles are 0.015 A and 2.9 degrees, respectively. In the crystal, two APC-PY trimers associate face to face into a hexamer. The assembly of two trimers within the hexamer is similar to that of C-phycocyanin (C-PC) and R-phycoerythrin (R-PE) hexamers, but the assembly tightness of the two trimers to the hexamer is not so high as that in C-PC and R-PE hexamers. The chromophore-protein interactions and possible pathway of energy transfer were discussed. Phycocyanobilin 1alpha84 of APC-PY forms 5 hydrogen bonds with 3 residues in subunit 2beta of another monomer. In R-PE and C-PC, chromophore 1alpha84 only forms 1 hydrogen bond with 2beta77 residue in subunit 2beta. This result may support and explain great spectrum difference exists between APC trimer and monomer.
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{{ABSTRACT_PUBMED_10358042}}


==About this Structure==
==About this Structure==
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[[Category: Zhang, J P.]]
[[Category: Zhang, J P.]]
[[Category: Helix-turn-helix]]
[[Category: Helix-turn-helix]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 22:56:03 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 10:34:46 2008''

Revision as of 07:34, 2 July 2008

File:1kn1.png

Template:STRUCTURE 1kn1

Crystal structure of allophycocyanin

Template:ABSTRACT PUBMED 10358042

About this Structure

1KN1 is a Protein complex structure of sequences from Porphyra yezoensis. Full crystallographic information is available from OCA.

Reference

Crystal structure of allophycocyanin from red algae Porphyra yezoensis at 2.2-A resolution., Liu JY, Jiang T, Zhang JP, Liang DC, J Biol Chem. 1999 Jun 11;274(24):16945-52. PMID:10358042

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