Article (Scientific journals)
On the substrate specificity of bacterial DD-peptidases: evidence from two series of peptidoglycan-mimetic peptides
Anderson, J. W.; Adediran, S. A.; Charlier, Paulette et al.
2003In Biochemical Journal, 373 (Part 3), p. 949-955
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Keywords :
bacterial DD-peptidase; enzyme specificity; peptide substrate; peptidoglycan; penicillin-binding protein; steady-state kinetics
Abstract :
[en] The reactions between bacterial DD-peptidases and beta-lactam antibiotics have been studied for many years. Less well understood are the interactions between these enzymes and their natural substrates, presumably the peptide moieties of peptidoglycan. In general, remarkably little activity has previously been demonstrated in vitro against potential peptide substrates, although in many cases the peptides employed were non-specific and not homologous with the relevant peptidoglycan. In this paper, the specificity of a panel of DD-peptidases against elements of species-specific D-alanyl-D-alanine peptides has been assessed. In two cases, those of soluble, low-molecular-mass DD-peptidases, high activity against the relevant peptides has been demonstrated. In these cases, the high specificity is towards the free N-terminus of the peptidoglycan fragment. With a number of other enzymes, particularly high-molecular-mass DD-peptidases, little or no activity against these peptides was observed. In separate experiments, the reactivity of the enzymes against the central, largely invariant, peptide stem was examined. None of the enzymes surveyed showed high activity against this structural element although weak specificity in the expected direction towards the one structural variable (D-gammaGln versus D-gammaGlu) was observed. The current state of understanding of the activity of these enzymes in vitro is discussed.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Anderson, J. W.
Adediran, S. A.
Charlier, Paulette ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Nguyen-Distèche, Martine ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Frère, Jean-Marie ;  Université de Liège - ULiège > Département des sciences de la vie > Département des sciences de la vie
Nicholas, R. A.
Pratt, R. F.
Language :
English
Title :
On the substrate specificity of bacterial DD-peptidases: evidence from two series of peptidoglycan-mimetic peptides
Publication date :
01 August 2003
Journal title :
Biochemical Journal
ISSN :
0264-6021
eISSN :
1470-8728
Publisher :
Portland Press, London, United Kingdom
Volume :
373
Issue :
Part 3
Pages :
949-955
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 November 2010

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