Escherichia coli K-12 mutant forming a temperature-sensitive D-serine deaminase
نویسندگان
چکیده
منابع مشابه
Positive control in the D-serine deaminase system of Escherichia coli K-12.
Two new types of D-serine deaminase (Dsdase)-negative mutants have been isolated and characterized. The first fails to synthesize a functional dsdC gene product as a result of dsdC- (regulator negative) mutations. The mutations lie in the dsdC region, are cis and trans recessive to dsdC+, and give rise to revertants of novel regulatory phenotype. The second class consists of Dsdase-negative lys...
متن کاملL-Serine-sensitive mutants of Escherichia coli K-12.
While attempting to isolate d-serine-sensitive mutants of Escherichia coli K-12, we found a class of mutants sensitive to low concentrations of l-serine (10 to 25 mug/ml).
متن کاملD-serine transport system in Escherichia coli K-12.
The d-serine transport system in Escherichia coli K-12 was studied by use of a mutant unable to form d-serine deaminase, yet resistant to d-serine. The mutant is greatly impaired in its ability to accumulate d-serine, d-alanine, and glycine. Transport of l-alanine is partially affected but transport of l-serine is unaffected. The mutant is also resistant to d-cycloserine, indicating that d-seri...
متن کاملTemperature-Sensitive Mutants of Escherichia coli K-12
Crosses were carried out at 34 C and 42 C between eight pairs of isogenic strains of Escherichia coli K-12. The donor and recipient of each pair carried the same mutation for temperature-sensitive deoxyribonucleic acid (DNA) synthesis; they differed only in the presence of F-lac in the donor and a spectinomycin-resistance marker in the recipient. A different temperature-sensitive mutation was p...
متن کاملL-serine deaminase of Escherichia coli.
The native l-serine deaminase (l-serine hydrolyase, deaminating, EC 4.2.1.13) of Escherichia coli K-12, which seems to be a very labile protein, is rather stable in concentrated solution. Dilution rapidly inactivates it, but in the presence of a saturating concentration of l-serine the molecule is protected from inactivation. It is a very specific enzyme; l-serine is the sole substrate with a K...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1975
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.121.3.1074-1077.1975