Abstract
In order to clone the Escherichia coli gene for the stringent starvation protein (SSP), we determined its N-terminal sequence as well as the sequence of two peptide fragments obtained by cyanogen bromide cleavage of the protein. We then chemically synthesized four sets of oligodeoxyribonucleotide mixtures that represented possible codon combinations for parts of these amino acid sequences. The synthetic oligonucleotides were labelled with 32P at their 5'-termini and used as hybridization probes to detect DNA fragments containing the complementary sequences. Genomic Southern hybridization of E. coli chromosomal DNA gave up to ten DNA fragments hybridizing with each probe but only a few hybridized with two or more of the probes. The latter fragments were cloned in pBR322. By determining partial base sequences with a rapid method and examining proteins encoded by the DNA fragments, we were able to show that we had isolated a clone containing the complete SSP structural gene.
MeSH Terms
Amino Acid Sequence
Base Sequence
Cloning, Molecular
DNA Restriction Enzymes
DNA, Superhelical/genetics
Escherichia coli/genetics
GTP Pyrophosphokinase/genetics
Genes
Genes, Bacterial
Nucleic Acid Hybridization
Phosphotransferases/genetics
Plasmids
Chemicals
DNA, Superhelical
Phosphotransferases
GTP Pyrophosphokinase
DNA Restriction Enzymes
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Fukuda R
Yano R
Fukui T
Hase T
Ishihama A
Matsubara H
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