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Colicin

Colicin

(Science: pharmacology) a group of antibiotics 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 plasmids, like col e1.

Colicins e2 and E3 are ab toxins with DNAase and RNAase activity respectively. most other colicins are channel forming transmembrane peptides. Coded on plasmids which can be transferred at conjugation.


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Re: Mapping mutants-how to interpret expreiment results.

... medium a- Minimal agar with arginine and tryptophan Screening medium Number of colonies Glucose MA + arg 337 Galk argC trpfF Glucose MA + colicin B 54 GalK tolB trpF argC Glucose MA + arg + colicin B 140 GalK argC tolB TrpF Glucose MA 57 GalK trpF argC Selective medium b-arginine and thiamin ...

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by turlaa
Wed May 19, 2010 10:51 pm
 
Forum: Microbiology
Topic: Mapping mutants-how to interpret expreiment results.
Replies: 2
Views: 2353

Mapping mutants-how to interpret expreiment results.

... markers Selective medium a- Minimal agar with arginine and tryptophan Screening medium Number of colonies Glucose MA + arg 337 Glucose MA + colicin B 54 Glucose MA + arg + colicin B 140 Glucose MA 57 Selective medium b-arginine and thiamin Screening medium Number of colonies Glucose MA + ...

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by turlaa
Wed May 19, 2010 10:40 pm
 
Forum: Microbiology
Topic: Mapping mutants-how to interpret expreiment results.
Replies: 2
Views: 2353

colicin2

Depends on what you call antibiotic :wink: More seriously, colicin have such a narrow range of activity (They are mostly intraspecific, and there is a lot of resistance) that they cannot be used as antibiotic in medicine. But I can't give a more precise ...

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by canalon
Wed Oct 05, 2005 9:04 pm
 
Forum: Microbiology
Topic: colicin2
Replies: 5
Views: 2741

colicin2

Isn't colicin an antibiotic? From what i know some strands of E.coli produce it...

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by MrMistery
Tue Oct 04, 2005 5:57 pm
 
Forum: Microbiology
Topic: colicin2
Replies: 5
Views: 2741

colicin2

tell me the diff.bw colicin and antibiotic.

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by lara
Tue Oct 04, 2005 10:01 am
 
Forum: Microbiology
Topic: colicin2
Replies: 5
Views: 2741
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