BioScience Dictionary

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Found Escherichia coli 20 times.

Displaying results 1 to 10.

1. C600
A strain of the bacteria Escherichia coli which is used in genetics experiments as a host for foreign plasmid s that have been clone d.

2. Chi sequence
A specific sequence of nucleotide s on a site on the genome of the bacteria Escherichia coli which strongly encourages recombination and crossing over to occur at that site.

3. Cohen, Stanley
Born 1922. A molecular biologist who was the first to do experiments in the molecular cloning of gene s from one strain of bacteria into another. In particular, he cloned the gene for resistance to tetracycline (an antibiotic ), found in Staphylococcus aureus , into Escherichia coli , which did not have resistance to tetracycline before. By doing this, he demonstrated that it is possible to take genes from one organism, put them into a different organism, and have the gene survive intact and able to make functioning protein s in the new organism.

4. Col E1
A plasmid which naturally occurs in some strains of the bacteria Escherichia coli. It codes for an E. coli-produced antibiotic called a colicin and immunity to its self-produced colicin (so that it doesn't unintentionally destroy itself). It is one of a number of such plasmids, each of which code for a different type of colicin. The plasmid is useful for making cloning vector s for making recombinant DNA molecules.

5. Colicin
A group of antibiotic s naturally produced by the bacteria Escherichia coli which kills other bacteria by a variety of methods (depending on the type), such as blocking protein synthesis and degrading DNA . Colicins are encoded by a group of naturally occurring E. coli plasmid s, like Col E1 .

6. Consensus sequence
A sequence of nucleotide base s which are extremely similar among many different gene s of different systems. In eukaryote s, this sequence is known as the "TATA box" or the "Hogness box," and it has the general sequence of TATAAAA. In the bacteria Escherichia coli it is known as the "Pribnow box" and has the general sequence of TATAATG. The sequence is most often found in promoter s and does important things like binding important protein s (including RNA polymerase ) to initiate transcription .

7. DNA gene
Any of a number of gene s found in the bacteria Escherichia coli which makes protein s that are essential for DNA replication .

8. DNA gyrase
An enzyme found in the bacteria Escherichia coli that introduces negative supercoiling into DNA molecules. DNA molecules are normally positively supercoiled or relaxed .

9. DnaA gene
A defective gene of the bacteria Escherichia coli which produces a defective protein that influences DNA replication .

10. DnaB gene
A gene found in the bacteria Escherichia coli which makes a protein that is involved in the formation of primer polynucleotide chains, which are precursors of DNA replication .