By Alexander Tzagoloff (auth.), Alexander Tzagoloff (eds.)
There are at the moment increasingly more laboratories actively learning the mechanism during which quite a few organic membranes are assembled. This region of study remains to be quite new to biochemists and molecular biologists, yet in view of the fast development being made, a evaluate of the sphere at the moment is justified. the current quantity makes a speciality of the biogenesis of 3 similar membranes. Mitochondria and chloroplasts are semiautonomous organelles whose biogenesis is conducted partially within the exterior cytoplasm and in part by means of the organelles themselves. either membranes are largely involved in the power metabolism of the mobile, and this commonality of functionality is mirrored in a substantial measure of similarity of their ul trastructure and enzymatic composition. even if the bacterial cellphone membrane is a way more diverse constitution, it additionally fulfills the fundamental strength standards of the phone, and counting on the organism, this may take the shape of photosynthesis or oxidative phosphorylation. The addi tional attention that prokaryotic organisms may well, in truth, be the evolu tionary ancestors of mitochondria and chloroplasts, makes all of it the extra compelling that these attracted to biogenesis concentrate on new strengthen ments in each one of those 3 components. In organizing this publication, I felt that the members should still summarize and convey brand new their very own examine and evaluation the literature purely in sofar as will be essential to give you the right standpoint for his or her work.
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Extra info for Membrane Biogenesis: Mitochondria, Chloroplasts, and Bacteria
3. Is Derepression Continuous or Discontinuous? Previous studies of the phenomenon had suggested to some investigators that derepression might be discontinuous in the sense that it might involve a modification of preexisting repressed mitochondria, as well as the generation from them of new, de repressed ones.
PERLMAN, Department of Genetics, Ohio State University, Columbus, Ohio, 43210. Dr. Mahler, to whom correspondence should be addressed, is the recipient of a Research Career Award K06 GM 05060 from the Institute of General Medical Sciences. Publication No. 2582. This research was supported by Research Grant GM 12228-11 from the Institute of General Medical Sciences. 15 16 Henry R. Mahler et al. nucleocytosolic system of the eukaryotic cell (for recent reviews see refs. 1~1O). Our group at Indiana University has been participating in these efforts since 1963, using, as do many others in the field, the versatile, unicellular eukaryote, Saccharomyces cerevisiae (Baker's yeast)-an ascomycete-as our object of study.
1. Is It Necessary to Have Recourse to Perturbed Systems? Two methods have generally been used to resolve the contributions of the two cellular protein-synthesizing systems to the biosynthesis of mitochondrial components of defined function and structure (for reviews see refs. 3, 7, 9): p- mutants-all of which lack the mitochondrial systemand the use of site-specific inhibitors-usually CHX for the cytoribosomal and CAP, ethidium bromide, and euflavine for the mitoribosomal one. Although the two approaches have, in general, given consistent results and have allowed significant inferences concerning the nature of the contributions, they are not as well suited for determining amounts of the contributions and, particularly, their interactions and mutual regulation.
Membrane Biogenesis: Mitochondria, Chloroplasts, and Bacteria by Alexander Tzagoloff (auth.), Alexander Tzagoloff (eds.)