| | 1 | Author
| Bengt Svensson, Imre Vass, Stenbjörn Styring | Requires cookie* | | | Title
| Sequence Analysis of the D 1 and D 2 Reaction Center Proteins of Photosystem II  | | | | Abstract
| A com pilation o f 38 sequences for the D1 and 15 sequences for the D 2 reaction center pro teins o f photosystem II is presented. The sequences have been compared and a similarity index that takes into account the degree o f conservation and the quality o f the changes in each posi tion has been calculated. The similarity index is used to identify and describe functionally im portant domains in the D 1 /D 2 heterodimer. Comparative hydropathy plot are presented for the aminoacid sidechains that constitute the binding domain o f the tyrosine radicals, Tyrz and TyrD, in photosystem II. The structure around Tyrz is more hydrophilic than the structure around TyrD. The hydrophilic residues are clustered in the part o f the binding pocket for Tyrz that is turned towards the lumenal side o f the thylakoid membrane. M ost prominent is the presence o f two conserved carboxylic am inoacids, D l-A sp 170 and D l-G lu 189. Their respec tive carboxyl-groups com e close in space and are proposed to constitute a metal binding site together with D l-G ln 165. The distance between the proposed metal binding site and the cen ter o f the ring o f Tyrz is approximately 7Ä . The cavity that constitutes the binding site for TyrD is com posed o f residues from the D 2 protein. Its character is more hydrophobic than the Tyrz site and the environment around TyrD lacks the cluster o f putative metal binding side chains. | | | |
Reference
| Z. Naturforsch. 46c, 765 (1991); received March 13 1991 | | | |
Published
| 1991 | | | |
Keywords
| Photosystem II, D1 Protein, D 2 Protein, Tyrosine, M anganese, Reaction Center | | | |
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| default:Reihe_C/46/ZNC-1991-46c-0765.pdf | | | | Identifier
| ZNC-1991-46c-0765 | | | | Volume
| 46 | |
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