Biochemistry of Membrane Transport: FEBS — Symposium No. 42 by K. Mühlethaler (auth.), Professor Dr. Giorgio Semenza,

By K. Mühlethaler (auth.), Professor Dr. Giorgio Semenza, Professor Dr. Ernesto Carafoli (eds.)

This quantity includes the court cases of the FEBS Sym­ posium at the Biochemistry of Membrane delivery, which used to be held on the Swiss Institute of expertise, Zlirich, July 18-23, 1976. Of the audio system invited or­ iginally, merely 5 couldn't attend the assembly, and of the lectures given, all yet one of many texts are released right here. therefore, this quantity supplies a loyal ac­ count number of ways the assembly used to be initially conceived and really happened. This Symposium on Biochemistry of Membrane delivery used to be the 1st Symposium subsidized via the FEBS open air the annual FEBS-Meetings, after the particular assembly on commercial Biochemistry, which happened in Dublin in 1973, and it displays the curiosity and the fashion for gatherings of smaller measurement than the legit FEBS conferences. the subject of the Symposium was once a simple selection, not just simply because membrane delivery is becom­ ing an increasing number of very important to biochemistry each year, but in addition as a result long-standing curiosity of Swiss technological know-how within the box. within the collection of the themes and of the audio system, efforts have been made to accomplish as balanced a assurance of the realm as attainable. even if, due to the fact a few points of membrane biochemistry have been handled broadly on the parallel tenth Inter­ nationwide Congress of Biochemistry in Hamburg, GFR, cer­ tain subject matters got much less emphasis than others. The Symposium was once attended through approximately four hundred individuals (we anticipated 200-250); between them forty eight have been invited audio system, and a few 2 hundred contributed posters.

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16. Lineweaver-Burk plot of l/ascorbate-TMPD cytochrome c oxidase activity vs. l/cytochrome c concentration at progressively increasing concentrations of polycationic ferritin Figs. 17, 18. Concave fracture face of the energy-transducing membrane showing ferritin impressions after surface binding of polycationi c ferritin at 30 ~g/ml Fig. 17. Membrane frozen from 30 0 C Fig. 18. Membrane cooled to _10 o C, then frozen, shows ferritin impressions only in regions of integral proteins. x 67,500 24 therm after this general electrostatic crosslinking by artificial peripheral proteins, the thermotropic lateral translational mobility of the integral proteins was greatly diminished (Fig.

2. Motional Freedom of Cytochrome c Oxidase We have combined the use of thermotropic lateral translational motion of integral proteins with the use of cyt ox Ab to visually 29 o Fig. 28. Site-by-site distribution of cytochrome coxidase on the outer surface of the energy-transducing membrane in the condensed configuration. Fixed after complete oxidase inhibition by the ferritin conjugate of cyt ox Ab. x 113,000 follow the lateral movements specifically of cytochrome c oxidase in the hydrophobic interior of the energy-transducing membrane.

9 kcal . mol- 1 above and below the transition temperature, respectively. Cholesterol has been shown to decrease the rate of permeation of non-electrolytes across lipid bilayers in the liquid-crystalline state. It is well-known that cholesterol reduces the energy content of the lipid phase transition and it was found of interest to investigate the temperature dependency of water permeation across liposomes of mixtures of synthetic phospholipid with cholesterol. , 1969). The effect of cholesterol on water permeation in liposomes of dipalmitoyl lecithin is demonstrated in Figure 2.

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