Screening and characterization of microorganisms with glutaryl-7ADCA acylase activity.
Appl Microbiol Biotechnol
; 43(3): 508-13, 1995 Jul.
Article
en En
| MEDLINE
| ID: mdl-7632401
A screening of microorganisms producing glutaryl-7ADCA acylase, an enzyme able to hydrolyse glutaric acid selectively from glutaryl-3-deacetoxy-7-aminocephalosporanic acid (glutaryl-7ADCA), has been carried out in soil samples. Five microorganisms expressing acylase activity were isolated and classified as Bacillus cereus, Achromobacter xylosooxidans, Bacillus sp., Pseudomonas sp. and Pseudomonas paucimobilis. The screening was carried out by preparing enrichment cultures containing glutaryl-7-ADCA or cephalosporin C as the selective carbon source. Four model compounds (adipoyl-, glutamyl- and glutaryl-p-nitroanilide and glutarylcoumarin), mimicking the glutaryl-7ADCA beta-lactam moiety, were synthesized as substrates suitable for the rapid screening of the microorganisms (2500) isolated from the enrichment cultures. A total of 300 strains were active on the model substrates and only 5 displayed acylase activity on glutaryl-7ADCA. The fermentation parameters, such as pH and inducer concentration, for the optimal acylase expression and acylase specificity towards the model substrates were different for each strain.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Bacterias
/
Cefalosporinas
/
Amidohidrolasas
/
Glutaratos
Tipo de estudio:
Diagnostic_studies
/
Screening_studies
Idioma:
En
Revista:
Appl Microbiol Biotechnol
Año:
1995
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
Alemania