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  • 1
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 161 (1979), S. 309-321 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Rhabdomeric microvilli of the housefly were freeze-fractured (FF) and thin sectioned (TS) for ultrastructural examination. Ordered files of closely packed membrane particles (82 Å wide, 250 Å long) were seen (FF) on the microvillar membrane (usually E face). The long axis of each particle was canted about 45° to that of the microvillus. Occasionally particles in this array appeared on the P face. It is hypothesized that ordered particles may represent either a photopigment precursor stock, a second photolabile pigment, or the newly discovered sensitizing, UV-absorbing, photostable visual pigment. In the underlying membrane leaflet (P face) were found spherical (85 Å diameter) unoriented particles in a concentration of about 6,000/μm2. The size, shape and density of these structures are compatible with those of rhodopsin particles. These particles also covered the basal area of each microvillus. The findings from TS material were difficult to correlate with those from FF replicas. At high magnification the former showed that the plasma membrane of the transected microvillus is composed of spherical, hollow subunits (averaging 43 Å diameter), sometimes fused to form double, 86 Å units. These substructures were closely packed and continuous around the microvillus. This beaded plasma membrane, in rare cases, was doubled around the microvillus. In other instances the plasma membranes were continuous between neighboring microvilli. The physiological implications of these ultrastructural features are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 118 (1984), S. 124-132 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Incubation of transformed mouse fibroblasts with external ATP in alkaline medium low in divalent cations causes an increase in the permeability of the plasma membrane to nucleotides and other small molecules. Previous suggestions that the phosphorylation of a 44,000 dalton membrane protein is involved in this permeabilization process have been pursued. Fractionation of cells that had been incubated with [γ-32P] ATP revealed that the labeled 44K phosphoprotein was found in both the membrane and mitochondrial fractions. Incubation of fractions isolated from unlabeled cells with [γ-32P] ATP resulted in substantial formation of 32P-44K in the mitochondrial fraction and less incorporation in the membrane fraction. The 44,000 dalton protein was identified as the α-subunit of mitochondrial pyruvate dehydrogenase by partial proteolytic mapping and immunological cross-reactivity with antibodies prepared against bovine pyruvate dehydrogenase. The phosphorylation of this protein in whole cells by externally added ATP is suppressed by inclusion in the incubation medium of carboxyatractyloside (CAT) and EDTA. These substances have no effect on ATP-dependent permeabilization, indicating that the phosphorylation of pyruvate dehydrogenase is not involved in this process.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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