title: Phospholipid deacylating activities in murine leprosy bacilli.
abstract: 1) The particulate fraction of cultivated murine leprosy bacilli (Mycobacterium lepraemurium, rough colonies of the Hawaiian-Ogawa strain) contained phospholipid deacylating activities with acidic pH optima. It hydrolyzed phosphatidylcholine and phosphatidylethanolamine at similar rates, and phosphatidylinositol oligomannosides more slowly. It also hydrolyzed 1-acyl- and 2-acyl-GPCs (sn-glycerol 3-phosphocholine) more rapidly than phosphatidylcholine. 2) Ca2+ did not stimulate either diacyl- or monoacyl-hydrolase activity. Triton X-100 and Emulgen 913 had little influence on the hydrolysis of phosphatidylcholine, but at rather high concentrations inhibited the hydrolyses of 1-acyl- and 2-acyl-GPCs. Iron ions strongly inhibited the hydrolysis of phosphatidylcholine, but caused little or no inhibition of the deacylations of 1-acyl- and 2-acyl-GPCs. 3) With 1-[stearoyl-14C]phosphatidylcholine and 2-[oleoyl-14C]phosphatidylcholine as substrates, both labeled fatty acid and lysophosphatidylcholine were produced. Labeled fatty acid appeared more rapidly from 2-[oleoyl-14C]phosphatidylcholine than labeled lysophosphatidylcholine, while labeled lysophosphatidylcholine was produced more than labeled fatty acid from 1-[stearoyl-14C]phosphatidylcholine in the early stage of incubation.
mesh_terms: D000818:Animals; D003902:Detergents / Q000494:pharmacology; D005260:Female; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D006867:Hydrolases / Q000378:metabolism*; D006868:Hydrolysis; D007501:Iron / Q000494:pharmacology; D051379:Mice; D009167:Mycobacterium lepraemurium / Q000378:metabolism*; D010713:Phosphatidylcholines / Q000378:metabolism; D010743:Phospholipids / Q000378:metabolism*
chemical_list: D003902:Detergents; D010713:Phosphatidylcholines; D010743:Phospholipids; D007501:Iron; D006867:Hydrolases