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caption="2plt, resolution 1.5&Aring;" />
'''STRUCTURE DETERMINATION OF PLASTOCYANIN FROM A CRYSTAL SPECIMEN WITH HEMIHEDRAL TWINNING FRACTION OF ONE-HALF'''<br />

==Overview==
The crystal structure of plastocyanin from the green alga Chlamydomonas, reinhardtii has been determined at 1.5-A resolution with a, crystallographic R factor of 16.8%. Plastocyanin is a small (98 amino, acids), blue copper-binding protein that catalyzes the transfer of, electrons in oxygenic photosynthesis from cytochrome f in the quinol, oxidase complex to P700+ in photosystem I. Chlamydomonas reinhardtii, plastocyanin is an eight-stranded, antiparallel beta-barrel with a single, copper atom coordinated in quasitetrahedral geometry by two imidazole, nitrogens (from His-37 and His-87), a cysteine sulfur (from Cys-84), and a, methionine sulfur (from Met-92). The molecule contains a region of, negative charge surrounding Tyr-83 (the putative distant site of electron, transfer) and an exclusively hydrophobic region surrounding His-87; these, regions are thought to be involved in the recognition of reaction partners, for the purpose of directing electron transfer. Chlamydomonas reinhardtii, plastocyanin is similar to the other plastocyanins of known structure, particularly the green algal plastocyanins from Enteromorpha prolifera and, Scenedesmus obliquus. A potential "through-bond" path of electron transfer, has been identified in the protein that involves the side chain of Tyr-83, the main-chain atoms between residues 83 and 84, the side chain of Cys-84, the copper atom, and the side chain of His-87.

==About this Structure==
2PLT is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Chlamydomonas_reinhardtii Chlamydomonas reinhardtii] with CU and CA as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2PLT OCA]. 

==Reference==
The 1.5-A crystal structure of plastocyanin from the green alga Chlamydomonas reinhardtii., Redinbo MR, Cascio D, Choukair MK, Rice D, Merchant S, Yeates TO, Biochemistry. 1993 Oct 12;32(40):10560-7. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8399201 8399201]
[[Category: Chlamydomonas reinhardtii]]
[[Category: Single protein]]
[[Category: Merchant, S.]]
[[Category: Redinbo, M.R.]]
[[Category: Yeates, T.O.]]
[[Category: CA]]
[[Category: CU]]
[[Category: electron transport]]

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