By William A. Frazier, Beth L. Meyers-Hutchins, Gordon A. Jamieson Jr. (auth.), Elliot Elson, William Frazier, Luis Glaser (eds.)

We are super happy that every one of the chapters during this quantity offer up to date info on a number of themes of curiosity to scientists engaged on membrane biology. As some time past, now we have tried to expedite the transition from submission of the manuscripts to e-book as a way to make the experiences as well timed as attainable. phone biology and molecular biology are more and more be­ coming fascinated by the examine of structural parts in cells and their assem­ bly. the principles which govern membrane synthesis, meeting and interplay of membrane elements with different mobile components, particularly the cytoskeleton, are on the middle of analysis in those fields. we are going to proceed in next volumes of this sequence to target those parts. we might welcome feedback of themes which might take advantage of a evaluate this day. We thank the entire members for offering those very very good reports and for doing so briskly. Elliot L. Elson William A. Frazier Luis Glaser St. Louis, Missouri vii CONTENTS bankruptcy 1 Chemotactic Transduction within the mobile Slime Molds William A. Frazier, Beth L. Meyers-Hutchins, Gordon A. Jamieson, Jr. , and Nancy J. Galvin 1. Introduction-Chemotaxis within the mobile Slime Molds . . . . . . . . . . . 2. Receptors for Chemoattractants of the mobile Slime Molds . . . . . . . four 2. 1. The Folate Receptor of Vegetative D. discoideum . . . . . . . . . . . four 2. 2. The cAMP Receptor of Aggregating D. discoideum . . . . . . . . . 6 three. Putative Transduction occasions in D. discoideum . . . . . . . . . . . . . . . . . 10 three. 1. cGMP and Guanylate Cyclase . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Extra resources for Cell Membranes: Methods and Reviews

Example text

As will CHEMOTAXIS IN CELUIlAR SLIME MOLDS 17 be seen in Section 4, calcium is an important regulatory ion for the processes of actin and actomyosin gelation and contraction, and several calcium-sensitive proteins have been identified which appear to regulate contractile processes in Dictyostelium (Condeelis and Vahey, 1982; Taylor and Fechheimer, 1981, 1982). , 1980). Recently CaM was purified using conventional, nonaffinity methods from Dictyostelium cells by Bazari and Clarke (1981). The protein was found to have some of the same functional properties in terms of mediating calcium-dependent processes as CaMs from higher organisms.

257:12204-12208. Luna, E. , Fowler, V. , and Taylor, D. , 1981, A membrane cytoskeleton from Dictyostelium discoideum, I. Identification and partial characterization of an actin-binding activity, J. Cell Bioi. 88:396-409. Majerfeld, I. , Leichtling, B. , Meligeni, J. , and Rickenberg, H. , 1984, A cytosolic cyclic AMP-dependent protein kinase in Dictyostelium discoideum: I. Properties, J. Bioi. Chem. 259:654-661. , 1973, Correlation of substrate specificity of cAMPphosphodiesterase in Dictyostelium discoideum with chemotactic activity of cAMP analogues, FEBS Lett.

1983) may have created conditions in their in vitro methylation experiments which allowed the methylation of calmodulin. We have not been able to detect any Nmethylation of purified Dictyostelium CaM using S-adenosylmethionine as a methyl donor in vitro (Skogen, Jamieson, and Frazier, unpublished observations). The effect of chemoattractants on the methylation of the Mr-17,ooo protein has not yet been reported. 4. Phosphorylation Reactions The involvement of intracellular cAMP in the regulation of phosphorylation reactions has spurred the efforts of many investigators who have tried to detect a change in phosphorylation reactions inside Dictyostelium cells upon chemotactic stimulation.

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