By G E. W. Wolstenholme, Cecilia M. 1927- O'Connor, Ciba Foundation Symposium on the Regulat

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C red. cyt. c red. y t . c red. cyl. c red. cyt. c red. * sp. act.? * sp. act.? /g. Uver. ActJmg. protein N. 33%DOC- 4 . 8 6 . No. refera to length of spin at 105 000 g used to bring down pellet from DOC-treated microsornes after previously spinning d o h RNP particles. Thus 0-2 hr. = 2 hr. pellet and 2-6 hr. pellet obtained after spinning supernatant from 0-2 hr. pellet for 4 hre. - Data taken from Ernster, Palade and Siekevitz (unpublished). figures. However, it is clear that we are recovering a good deal of the initial enzyme activity in our preparation.

1958) that the rate of reoxidation of TPNH may control glucose-6phosphate dehydrogenase activity, and this could be regulated, according to the scheme, by the rate of oxidation of this compound by the microsomal enzyme, the TPNH-cytochrome c reductase. The rates of enzymic activity, in this case hexokinase, phosphoglucomutase, and phosphorylase, might be enhanced by being attached to the ER membranes. This could be accomplished in two ways; in the first, hexokinase could be ‘‘activated ” according to the several biochemical considerations cited above; in the second, an inactive enzyme could be activated by a process taking place at the membrane surface.

On the basis of a unitary hypothesis, there is very little reason to doubt that the local variations within a single cell, or the variations in character between different cells, are just variations, and that all are derived from a common system of membrane-limited Porter, 1957). This system fragments lumina (Palade, 1956~; upon homogenization and gives rise to the microsome fraction in the usual differential centrifugation technique ( Palade and Siekevitz, 19564. Now I propose to take you on a brief journey from the outer spaces of the extracellular fluid to the inner ones of the nucleus.

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