Article (Scientific journals)
Site-Directed Mutagenesis of the Streptomyces R61 Dd-Peptidase. Catalytic Function of the Conserved Residues around the Active Site and a Comparison with Class-a and Class-C Beta-Lactamases
Hadonou, Ayaovi Medard; Wilkin, Jean-Marc; Varetto, Louis et al.
1992In European Journal of Biochemistry, 207 (1), p. 97-102
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Keywords :
Mutagenèse dirigée; Streptomyces R61; DD-peptidase
Abstract :
[en] The importance of various residues in the Streptomyces R61 penicillin-sensitive DD-peptidase has been assessed by site-directed mutagenesis. The replacement of the active Ser62 by a Cys residue yielded an inactive protein which was also unable to recognize penicillin. The activity of the Lys65 → Arg mutant with the peptide and thiol ester substrates was decreased 100-200-fold and the rate of penicillin inactivation was decreased 20 000-fold or more. The mutant thus behaved as a poor, but penicillin-resistant, DD-peptidase. The other studied mutations, the mutations Phe358 → Leu, Tyr90 → Asn, Thr101 → Asn, Phe164 → Ala, Asp225 → Glu and Asp225 → Asn had little influence on the catalytic and penicillin-binding properties. The Asp225 mutants did not exhibit an increased sensitivity to cefotaxime. The Phe164 → Ala mutant was significantly more unstable than the wild-type enzyme.
Research center :
CIP - Centre d'Ingénierie des Protéines - ULiège
Disciplines :
Microbiology
Author, co-author :
Hadonou, Ayaovi Medard;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Wilkin, Jean-Marc;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Varetto, Louis ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Joris, Bernard ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Lamotte-Brasseur, Josette ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Klein, Daniel;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Duez, Colette ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Ghuysen, Jean-Marie 
Frère, Jean-Marie ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Language :
English
Title :
Site-Directed Mutagenesis of the Streptomyces R61 Dd-Peptidase. Catalytic Function of the Conserved Residues around the Active Site and a Comparison with Class-a and Class-C Beta-Lactamases
Publication date :
01 July 1992
Journal title :
European Journal of Biochemistry
ISSN :
0014-2956
eISSN :
1432-1033
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
207
Issue :
1
Pages :
97-102
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 February 2009

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