M. tuberculosis PknD sensor domain interacts with host laminin. A. M. tuberculosis WT and pknD mutant were incubated in wells coated with components of the extracellular matrix (laminin, fibronectin, and collagen). The pknD mutant demonstrated a 2-fold reduction in adhesion to the laminin matrix (P = 0.001), while not exhibiting significantly reduced adhesion to fibronectin or collagen. CFU counts are represented as mean ± standard deviation. N.S. = not significantly different. B and C. Coated microspheres were incubated with HBMEC, followed by immunostaining for laminin. Microspheres coated with PknD sensor (panel C) associated with the periphery of laminin staining more than those coated with BSA (panel B), which were evenly distributed throughout the field of view.