The vanC and vanE operons employ serine instead of lactate as the glycopeptide-insusceptible
terminal moiety in the pentapeptide in peptidoglycan synthesis [4,6].
Variations in the vanA operon that are dependent on the
area that the host pathogen has been isolated have been
identified; for instance, the nucleotide sequence of operons
from strains isolated in the United States differs from
those in the UK [7]. However, this operon can also vary
within a small geographical area and different insertions