Model for the catalytic reaction mediated by the gene products of BP0399 and BP0398 of B. pertussis Tohama I derivatives, representative of the orthologous proteins of other bordetellae. Hypothesized reactions are based on amino acid sequence similarities of the gene products of BP0399 and BP0398 to ArnC/GtrB and ArnT proteins, respectively. GlcN is symbolized by a hexagon. PP, periplasm; IM, inner membrane; CP, cytoplasm; Pi, phosphate (inorganic).