title: Subcellular localization of alkaline phosphatase in Bacillus licheniformis 749/C by immunoelectron microscopy with colloidal gold.
abstract: Subcellular distribution of the alkaline phosphatase of Bacillus licheniformis 749/C was determined by an immunoelectron microscopy method. Anti-alkaline phosphatase antibody labeled with 15- to 18-nm colloidal gold particles (gold-immunoglobulin G [IgG] complex) were used for the study. Both the plasma membrane and cytoplasmic material were labeled with the gold-IgG particles. These particles formed clusters in association with the plasma membrane; in contrast, in the cytoplasm the particles were largely dispersed, and only a few clusters were found. The gold-IgG binding was quantitatively estimated by stereological analysis of labeled, frozen thin sections. This estimation of a variety of control samples showed that the labeling was specific for the alkaline phosphatase. Cluster formation of the gold-IgG particles in association with the plasma membrane suggests that existence of specific alkaline phosphatase binding sites (receptors) in the plasma membrane of B. licheniformis 749/C.
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism*; D001407:Bacillus / Q000201:enzymology* / Q000648:ultrastructure; D002462:Cell Membrane / Q000201:enzymology; D006046:Gold; D006651:Histocytochemistry; D007118:Immunoassay; D007074:Immunoglobulin G; D007202:Indicators and Reagents; D007700:Kinetics; D008854:Microscopy, Electron; D013347:Subcellular Fractions / Q000201:enzymology / Q000648:ultrastructure
chemical_list: D007074:Immunoglobulin G; D007202:Indicators and Reagents; D006046:Gold; D000469:Alkaline Phosphatase