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After the demonstration that Stigmatella aurantiaca DW4 secretes an endo-N-acetyl-beta-D-glucosaminidase (ENGase), acting on the di-N-acetylchitobiosyl part of N-linked glycans (S. Bourgerie, Y. Karamanos, T. Grard, and R. Julien, J. Bacteriol. 176:6170-6174, 1994), an ENGase activity having the same substrate specificity was also found to be secreted during vegetative growth of Myxococcus xanthus DK1622. The activity decreased in mutants known to secrete less protein than the wild type (Exc +/-). During submerged development, the activity was produced in two steps: the first increase occurred during the aggregation phase, and the second one occurred much later, during spore formation. This production was lower in developmental mutants impairing cell-cell signaling, the late mutants (csg and dsg) being the most deficient. Finally, when sporulation was obtained either by starvation in liquid shake flask culture or by glycerol induction, the activity was produced exclusively by the wild-type cells during the maturation of the coat.

journal of bacteriology

An endo-N-acetyl-beta-D-glucosaminidase, acting on the di-N-acetylchitobiosyl part of N-linked glycans, is secreted during sporulation of Myxococcus xanthus