The cloacin receptor of ColV-bearing Escherichia coli is part of the Fe3+-aerobactin transport system.
(25/26)
Escherichia coli strains which contain the Fe3+-aerobactin transport system specified by the ColV plasmid became deficient in aerobactin-dependent iron transport when they were converted to cloacin-resistant derivatives. An outer membrane protein with a molecular mass of 74,000 daltons was overproduced under iron-limiting growth conditions and was absent in cloacin-resistant mutants. Fe3+-aerobactin protected cells against cloacin. These results suggest that the cloacin receptor protein, controlled by the colV plasmid, also participates in Fe3+-aerobactin transport. (+info)
Sequence and secondary structure of the colicin fragment of Bacillus stearothermophilus 16S ribosomal RNA.
(26/26)
The sequence and the position of post-transcriptionally modified residues of the 3' -terminal end of Bacillus stearothermophilus 16S ribosomal RNA have been determined from the fragment that is cleaved off by bacteriocin treatment. The fragment contains 52 nucleotides, as compared to the 49 nucleotides of the corresponding fragment from E. coli ribosomes, The additional nucleotides are present in the sequence UCU very next to the 3' -terminus as was published earlier (1). The remainder of the sequence is identical to the one of E. coli except at six positions, due to the UV melting properties of the colicin fragment from B. stearothermophilus in comparison to the same fragment of E. coli show that the RNA from the thermophile has a more stable secondary structure. (+info)