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1kn1

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[[Image:1kn1.gif|left|200px]]<br /><applet load="1kn1" size="350" color="white" frame="true" align="right" spinBox="true"
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[[Image:1kn1.gif|left|200px]]
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caption="1kn1, resolution 2.2&Aring;" />
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'''Crystal structure of allophycocyanin'''<br />
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{{Structure
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|PDB= 1kn1 |SIZE=350|CAPTION= <scene name='initialview01'>1kn1</scene>, resolution 2.2&Aring;
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|SITE=
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|LIGAND= <scene name='pdbligand=BLA:BILIVERDINE+IX+ALPHA'>BLA</scene> and <scene name='pdbligand=CYC:PHYCOCYANOBILIN'>CYC</scene>
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|ACTIVITY=
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|GENE=
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}}
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'''Crystal structure of allophycocyanin'''
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==Overview==
==Overview==
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==About this Structure==
==About this Structure==
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1KN1 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Porphyra_yezoensis Porphyra yezoensis] with <scene name='pdbligand=BLA:'>BLA</scene> and <scene name='pdbligand=CYC:'>CYC</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KN1 OCA].
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1KN1 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Porphyra_yezoensis Porphyra yezoensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KN1 OCA].
==Reference==
==Reference==
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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:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10358042 10358042]
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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:[http://www.ncbi.nlm.nih.gov/pubmed/10358042 10358042]
[[Category: Porphyra yezoensis]]
[[Category: Porphyra yezoensis]]
[[Category: Protein complex]]
[[Category: Protein complex]]
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[[Category: helix-turn-helix]]
[[Category: helix-turn-helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:35:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 12:19:34 2008''

Revision as of 10:19, 20 March 2008

Image:1kn1.gif


PDB ID 1kn1

Drag the structure with the mouse to rotate
, resolution 2.2Å
Ligands: and
Coordinates: save as pdb, mmCIF, xml



Crystal structure of allophycocyanin


Overview

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.

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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