Divisome component that associates with the complex late in its assembly, after the Z-ring is formed, and is dependent on DivIC and PBP2B for its recruitment to the divisome. Together with EzrA, is a key component of the system that regulates PBP1 localization during cell cycle progression. Its main role could be the removal of PBP1 from the cell pole after pole maturation is completed. Also contributes to the recruitment of PBP1 to the division complex. Not essential for septum formation. Forms polymers through the coiled coil domains. Interacts with PBP1, MreC and EzrA. Shuttles between the lateral wall and the division site in a cell cycle-dependent manner. Cells lacking this gene have increased lysozyme resistance, which is important for escape from the host innate immune response. The lysozyme resistance is OatA-independent, but is dependent on PgdA, and an increased N-deacetylation of the peptidoglycan is observed in these cells. The phenotype is suppressed by the concomitant deletion of gpsB and pbpA1. Belongs to the GpsB family.