| | 1 | Author
| Hugo Scheer, Helmut Formanek, W. Olfhart Rüdiger | Requires cookie* | | | Title
| The Conformation of Bilin Chromophores in Biliproteins: Ramachandran-Type Calculations  | | | | Abstract
| Ramachandran-type calculations are perform ed for conformations o f bilin chromophores pres ent in the biliproteins phycocyanin, phycoerythrin and phytochrome. The atom ic coordinates are taken from x-ray data o f crystalline model compounds, namely biliverdin for pyrrole rings B, C, D and substituted succinimides for the hydrogenated ring A including a thioether containing ^-sub stituent. Maxima and m inim a for steric hindrance are calculated for rotation o f the thioether side chain, the rotation of pyrrole rings at single bonds (syn-anti-forms) and at double bonds (Z-E-iso-mers) of the methine bridges. Whereas quasi-planar structures are possible for all syn, Z-forms, only twisted structures are possible if anti, E-forms are considered. The relevance for the bilin con formations of native biliproteins and o f the Pr ^ Pfr phototransform ation is discussed. | | | |
Reference
| Z. Naturforsch. 34c, 1085 (1979); received June 29 1979 | | | |
Published
| 1979 | | | |
Keywords
| Bilin Conformation, Phycocyanin, Phycoerythrin, Phytochrome | | | |
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| default:Reihe_C/34/ZNC-1979-34c-1085.pdf | | | | Identifier
| ZNC-1979-34c-1085 | | | | Volume
| 34 | |
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