| | 1 | Author
| Wilhelm Menke, Alfons Radunz, GeorgH. Schmid, Friederike Koenig, Rolf-Dieter Hirtz | Requires cookie* | | | Title
| Intermolecular Interactions of Polypeptides and Lipids in the Thylakoid Membrane  | | | | Abstract
| Intermolecular interactions between chloroplast lipids and a polypeptide fraction from thylakoids were investigated by far ultraviolet circular dichroism. The polypeptide fraction was isolated from dodecyl sulfate-containing buffers. It exhibits an average molecular weight of 24 000. The circular dichroism of this polypeptide fraction measured as mean residue ellipticity is greater in the presence of sodium dodecyl sulfate than in the absence of this detergent. This effect is reversible. Addition of sulfoquinovosyl diglyceride to the dodecyl sulfate-free solution of the polypeptide also causes an increase of the circular dichroism. This increase was only observed in the pH-range between 6.9 and 7.4. The effect of dodecyl sulfate or sulfolipid on the circular dichroism is inter preted to indicate an increase of a-helix content. Monogalactosyl diglyceride, digalactosyl di glyceride and phosphatidyl glycerol gave no reaction. The attempt to obtain a conformational analysis of the polypeptide in the different states did not yield an entirely satisfactory result. Anti sera to sulfolipid inhibit photosynthetic electron transport of stroma-freed chloroplasts in the region of light reaction I. This inhibition is restricted to the same pH-range as the non-covalent binding of sulfolipid to the polypeptides. It appears that in the cell membrane-bound metabolic processes are regulated by this pH-dependence of the sulfolipid-polypetide interactions. | | | |
Reference
| (Z. Naturforsch. 31c, 436 [1976]; received April 30 1976) | | | |
Published
| 1976 | | | |
Keywords
| Interactions, Polypeptides, Lipids, Thylakoid Membrane, Photosynthesis | | | |
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| default:Reihe_C/31/ZNC-1976-31c-0436.pdf | | | | Identifier
| ZNC-1976-31c-0436 | | | | Volume
| 31 | |
| 2 | Author
| BrunoW. Urzer, B. A. Sf, A. Ktiengesellschaft | Requires cookie* | | | Title
| Interpretation of Plant Growth Responses to Chemicals | | | | Abstract
| W hile searching for chem ical com pounds with herbicidal or growth regulating activities the researcher gladly notices if intact plants respond to the treatments at all. By means of colour slides, which unfortunately could not be printed here, changes in plant growth and leaf colour induced by chem icals were dem onstrated as they usually occur in an industrial screening operation. The range of sym ptom s shown in the presentation included sim ple lethal necrosis, "bleaching", increased generation of anthocyans, deterioration of the plant tissue, control of axillary buds, the prevention of resprouting, stunting of the shoots, and epinasties. Chem ical com pounds synthesised in the BA SF laboratories and com m ercial products were applied. | | | |
Reference
| Z. Naturforsch. 34c, 931 (1979); received June 5 1979 | | | |
Published
| 1979 | | | |
Keywords
| Plant Growth R esponse, H erbicides, Growth Regulators, Indicator Plants, Interactions | | | |
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| default:Reihe_C/34/ZNC-1979-34c-0931.pdf | | | | Identifier
| ZNC-1979-34c-0931 | | | | Volume
| 34 | |
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