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J. Bacteriol., Jan 1997, 9-16, Vol 179, No. 1
AM Stranden, K Ehlert, H Labischinski and B Berger-Bachi
The femAB operon is involved in the formation of the characteristic
pentaglycine side chain of the staphylococcal peptidoglycan. Allele
replacement of the femAB operon with the tetracycline resistance
determinant tetK in a methicillin-resistant Staphylococcus aureus strain
resulted in impaired growth, methicillin hypersusceptibility, and
lysostaphin resistance. The usual pentaglycine cross-bridges were replaced
by monoglycine bridges exclusively, and cross-linking of the peptidoglycan
strands was drastically reduced. Complementation of the femAB null mutant
by either femA or femAB resulted in the extension of the cross-bridges to a
triglycine or a pentaglycine, respectively. This finding suggests that FemA
is responsible for the formation of glycines 2 and 3, and FemB is
responsible for formation of glycines 4 and 5, of the pentaglycine side
chain of the peptidoglycan precursor. Moreover, it can be deduced that
addition of the first glycine must occur by a femAB-independent mechanism.
Copyright © 1997, American Society for Microbiology
Cell wall monoglycine cross-bridges and methicillin hypersusceptibility in a femAB null mutant of methicillin-resistant Staphylococcus aureus
Institute of Medical Microbiology, University of Zurich, Switzerland.
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