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. 1989 Sep 1;262(2):457–462. doi: 10.1042/bj2620457

Active-site and membrane topology of the DD-peptidase/penicillin-binding protein no. 6 of Enterococcus hirae (Streptococcus faecium) A.T.C.C. 9790.

A el Kharroubi 1, G Piras 1, P Jacques 1, I Szabo 1, J Van Beeumen 1, J Coyette 1, J M Ghuysen 1
PMCID: PMC1133289  PMID: 2803261

Abstract

The membrane-bound 43,000-Mr penicillin-binding protein no. 6 (PBP6) of Enterococcus hirae consists of a 30,000-Mr DD-peptidase/penicillin-binding domain and a approximately 130-residue C-terminal appendage. Removal of this appendage by trypsin proteolysis has no marked effect on the catalytic activity and penicillin-binding capacity of the PBP. Anchorage of the PBP in the membrane appears to be mediated by a short 15-20-residue stretch at the C-terminal end of the appendage. The sequence of the 50-residue N-terminal region of the PBP shows high degree of homology with the sequences of the corresponding regions of the PBPs5 of Escherichia coli and Bacillus subtilis. On this basis the active-site serine residue occurs at position 35 in the enterococcal PBP.

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Selected References

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