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PubMed1975

Properties of a membrane-bound cardiolipin synthetase from Lactobacillus plantarum.

Cardiolipin (CL) synthetase of Lactobacillus plantarum 17-5 catalyzed the stoichiometric conversion of 2 mol of phosphatidylglycerol to 1 mol of CL. The enzyme activity was linear with time for 30 min at 37 C and with protein concentration between 20 and 200 mug of protein per ml. The enzyme was membrane associated, had a pH optimum of 5.1 in phosphate buffer, and was not stimulated by Mg2+, and the activity was not affected by the addition of ethylenediaminetetraacetic acid, cytidine diphosphate diglyceride, or cytidine triphosphate. The reaction was inhibited about 95% by Triton X-100 (0.5% final concentration) and by CL, the end product of the reaction. The activity of this enzyme was studied as a function of growth. The CL synthetase specific activity was highest during the early and midexponential growth phases, as was the cellular content of CL. The results demonstrate a correlation between enzyme-specific activity and lipid content of the cells.

Cardiolipins↗
PubMed1978

[Immunohistochemical study of cardiolipin and phosphatidylinositol in mouse liver].

Localization of two phospholipid haptens--cardiolipin and phosphatidylinositol--in mouse liver sections was studied by the indirect method of fluorescent antibodies. Two types of liver sections--paraffin and cryostat, and two type of fixation--in acetone, and in the acetone, buffer, and formalin mixture--were used. Antiphospholipid sera stain specifically the plasma membrane of hepatocytes and predominantly the membrane region overlooking the blood capillary. A possibility of detecting the specific phospholipid haptens depends on the method of obtaining the sections and their fixation. Two types of immunization give two types of antiphospholipid sera which differ by the stability, by the possibility of monospecific antibodies isolation from them on lipid immunosorbents, and by the types of liver section staining.

Animals↗
PubMed1979

Comparison of cardiolipin and treponemal tests in the serodiagnosis of yaws.

Results of the Veneral Disease Research Laboratory (VDRL), rapid plasma reagin (RPR), Treponema pallidum haemagglutination (TPHA), T. pallidum immobilisation (TPI), and fluorescent treponemal antibody absorption (FTA-ABS) tests on sera of 661 children from a region where yaws is hypoendemic are compared. For 107 (16.2%) out of 661 sera the FTA-ABS test was the only one showing reactivity; in these instances the test was weakly reactive (intensity of fluorescence scored as +) and the children had no history and no signs or symptoms of treponemal disease. A solitary, weakly reactive FTA-ABS test result seems to have no clinical significance in these cases. The FTA-ABS test can be used as a confirmatory test for yaws instead of the TPI test, if only the results of sera showing an intensity of fluorescence scored as ++ or more are considered to be positive. There appeared to be no significant differences in the results of the VDRL, RPR, and TPHA tests as screening tests for yaws when the TPI or FTA-ABS tests were used as reference tests.

Adolescent↗