title: Structure and probable genetic location of a "ribosome modulation factor" associated with 100S ribosomes in stationary-phase Escherichia coli cells.
abstract: The decrease in overall translation activity occurring concomitantly with the transition from the exponential growth phase to the stationary phase of Escherichia coli cells was found to be accompanied by the appearance of 100S ribosomes (dimers of 70S ribosome monomers). Analysis of ribosomal proteins by the radical-free and highly reducing method of two-dimensional gel electrophoresis indicated that a protein, designated protein E, was exclusively associated with 100S ribosomes. From the results, we propose that protein E is a "ribosome modulation factor" (RMF), which associates with 70S ribosomes and converts them to a dimeric form. A homology search of the partial amino acid sequence of RMF using the DNA sequence data bases revealed that the rmf gene, which encodes RMF, is located next to the fabA gene at 21.8 min on the E. coli chromosome.
authors.affiliation: Department of Physics, Faculty of Science, Kyoto University, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Wada
authors.forename: Y
authors.initials: Y
authors.lastname: Yamazaki
authors.forename: N
authors.initials: N
authors.lastname: Fujita
authors.forename: A
authors.initials: A
authors.lastname: Ishihama
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003545:Cysteine / Q000032:analysis; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics* / Q000254:growth & development / Q000648:ultrastructure; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D007256:Information Systems; D008969:Molecular Sequence Data; D012269:Ribosomal Proteins / Q000235:genetics / Q000302:isolation & purification*; D012270:Ribosomes / Q000378:metabolism* / Q000648:ultrastructure; D012689:Sequence Homology, Nucleic Acid
chemical_list: D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D012269:Ribosomal Proteins; C063545:ribosome modulation factor, E coli; D003545:Cysteine