By Nathan P. Kaplan, Nathan P. Colowick, Jackie D. Corbin, Joel G. Hardman

The seriously acclaimed laboratory average, Methods in Enzymology, is among the such a lot hugely revered guides within the box of biochemistry. due to the fact that 1955, every one quantity has been eagerly awaited, often consulted, and praised through researchers and reviewers alike. The sequence includes a lot fabric nonetheless proper this present day - actually a vital ebook for researchers in all fields of existence sciences

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For example it has been shown that glucose, a phosphorlyase effector, is a requirement for the removal of phosphate from phosphorylase a catalyzed by the reversal of the phosphorylase kinase reaction. Glucose appears to act by dissociating the tetrameric structure of phosphorylase a into the dimeric form. In the same manner, cAMP is necessary if phosphate is to be removed from the regulatory subunit of cAMP-dependent protein kinase under the action of the catalytic s u b u n i t 1°,12 o r cGMP-dependent protein kinase?

Embi, F. B. Caudwell, and P. Cohen, Eur. J. , in press (1982). 46 x 25 cm) at flow rates of 1 ml/min. Recoveries of 32p-labeled peptides were in the range of 70-85% except for site 2, which was variable between 50 and 70%. Slightly better recoveries of site 2 were obtained using 1-propanol than acetonitrile. Figures 3 and 4 present illustrative HPLC chromatograms of 32p-labeled peptides from synthase phosphorylated by several different kinases. 5 0 20 40 (50 80 I00 120 RETENTION TIME (MIN) FIG.

No albumin is added to the cell suspensions because its presence would distort the polyacrylamide gels eventually used to resolve the phosphoproteins. Carrier-free 32po43- (New England Nuclear) is added to a concentration of 10-20/zCi/mg cell protein and 2-5 ml of cells are incubated in 25-ml plastic flasks under 95% 02-5% CO2 for 45 min to allow the specific activity of the [32p]ATP in the cell to reach a constant value. 5 At 45 min, the hepatocytes are stimulated with the agent(s) of choice for the desired period (usually 3-15 min) and the incubations are stopped as described below.

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