View source for 1b33

[[Image:1b33.gif|left|200px]]<br /><applet load="1b33" size="350" color="white" frame="true" align="right" spinBox="true" 
caption="1b33, resolution 2.3&Aring;" />
'''STRUCTURE OF LIGHT HARVESTING COMPLEX OF ALLOPHYCOCYANIN ALPHA AND BETA CHAINS/CORE-LINKER COMPLEX AP*LC7.8'''<br />

==Overview==
An electrophoretically purified allophycocyanin-linker complex, AP. LC7.8, from phycobilisomes of Mastigocladus laminosus has been crystallized in the orthorhombic space group P212121. Cryocrystallographic x-ray measurements enabled the structural analysis of the complex at a resolution of 2.2 A. The asymmetric unit contains two side-to-side associated "trimeric" (alphabeta)3 allophycocyanin complexes comprising the linker polypeptide in a defined orientation inside the trimer. The linker representing a protein fold related to the prosegment of procarboxypeptidase A is in contact with only two of the three beta-subunits and directly interacts with the corresponding chromophores of these proteins. In addition to a modulation of the chromophores' spectral properties, the linker polypeptide attracts the alphabeta-subcomplexes, thereby bringing the beta-chromophores closer together. These results will enable interpretations of energy-transfer mechanisms within phycobiliproteins.

==About this Structure==
1B33 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Mastigocladus_laminosus Mastigocladus laminosus] with <scene name='pdbligand=BLA:'>BLA</scene>, <scene name='pdbligand=CYC:'>CYC</scene> and <scene name='pdbligand=BO4:'>BO4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B33 OCA]. 

==Reference==
Structural analysis at 2.2 A of orthorhombic crystals presents the asymmetry of the allophycocyanin-linker complex, AP.LC7.8, from phycobilisomes of Mastigocladus laminosus., Reuter W, Wiegand G, Huber R, Than ME, Proc Natl Acad Sci U S A. 1999 Feb 16;96(4):1363-8. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9990029 9990029]
[[Category: Mastigocladus laminosus]]
[[Category: Protein complex]]
[[Category: Huber, R.]]
[[Category: Reuter, W.]]
[[Category: Than, M E.]]
[[Category: Wiegand, G.]]
[[Category: BLA]]
[[Category: BO4]]
[[Category: CYC]]
[[Category: allophycocyanin]]
[[Category: complex structure]]
[[Category: cyanobacteria]]
[[Category: light-harvesting protein]]
[[Category: linker polypeptides]]

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