title: Accessibility of the (14C)benzylpenicillin binding proteins in membranes of sporulating bacilli.
abstract: Triton X-100 treatment or freeze-thawing damages the membranes of sporulating or vegetative cells as seen by protein leakage from cells. A 40% increase in the specific [(14)C]benzylpenicillin-binding capacity of detergent-treated or frozen sporulating cells was observed. Neither freezing nor Triton X-100 treatment of vegetative cells produced a detectable effect on their [(14)C]benzylpenicillin-binding capacity. These data indicate the presence of penicillin-binding sites in intact sporulating bacilli not accessible to penicillin in routine binding assays. The chemical specificity of [(14)C]benzylpenicillin binding to detergent-treated sporulating cells is similar to that observed with untreated vegetative or sporulating cells.
mesh_terms: D001410:Bacillus megaterium / Q000378:metabolism; D001412:Bacillus subtilis / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism*; D005615:Freezing; D008566:Membranes / Q000378:metabolism*; D010400:Penicillin G / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000494:pharmacology; D011485:Protein Binding; D013171:Spores, Bacterial / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D011092:Polyethylene Glycols; D010400:Penicillin G