Basic mechanisms of cellular secretion by Arthur R Hand; Constance Oliver; National Institute of

By Arthur R Hand; Constance Oliver; National Institute of Dental Research (U.S.)

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There are theoretical reasons for anticipating such a result, based on at least one model for the passage of proteins through membranes (Van Heijne and Blomberg, 1979). IV. , 1979). , glycerol) are used. However, when these strains are grown in the presence of maltose? and hence hybrid protein synthesis is induced, there are adverse effects on cell growth. , 1979). Several observations have led us to the following explanation for these findings. Those hybrid proteins that have become embedded in the cytoplasmic membrane (most of the MBPP-galactosidase hybrid proteins and a fraction of the large hrec-P-galactosidase hybrid proteins) have blocked sites in the membrane where a number of proteins are normally secreted.

Import of glycolytically generated ATP from the cytoplasm via the adenine nucleotide transporter is inhibited by bongkrekic acid or the nuclear op, mutation. 48 MARIA-LUISA MACCECCHINI FIG. 5. ATP depletion of the mitochondria1 matrix inhibits the in vivo maturation of cytoplasmically made proteins located in the matrix or in the inner mitochondrial membrane, but not in the intermembrane space. 5 ml of a suspension of rhospheroplasts was incubated at 29°C for 60 minutes with gentle shaking. 5 ml of medium alone (-) or medium containing 73 nM of bongkrekic acid (+) was added.

Sci. A. 75, 715-719. Wagner, R. R . (1975). Compr. Virol. 4, 1-94, Walsh, F. , and Crumpton, M. J. (1977). Nurure (London) 269, 307-31 I . Wirth, D. , Katz, F. , and Lodish, H. F. (1977). Cell 10, 253-263. Wirth, D. , Lodish, H. , and Robbins, P. W. (1979). J. CellEiol. 81, 154-162. , and Lodish, H. (1980). Cell 21, 417-427. METHODS I N CELL BIOLOGY, VOLUME 23 Chapter 3 The Genetics of Protein Secretion in Escherichiu coli PHILIP J. ,' SCOTT D. EMR,* THOMAS J. SILHAVY,2 AND JON BECKWITH Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts HUGHES BEDOUELLE, JEAN-MARIE CLEMENT, JOE HEDGPETH,3 AND MAURICE HOFNUNG Unite de Programmation MolPEulaire et Toxicologie Genetique, Institut Pasteur, Paris.

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