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  • Life and Medical Sciences  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Cooperative binding of concanavalin a to thymocyte membrane vesicles augments uptake of α-aminoisobutyrate (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 89 (1976), S. 775-777 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: (1) Membrane vesicles from rabbit thymocytes accumulate α-aminoisobutyrate in the presence of 0.1 M NaCl. Uptake is 1/2 maximal after about 2 min and reaches a plateau value (61 pmoles/mg protein) after 30 min. (2) Up to 25 μg concanavalin A/ml, binding of the lectin describes a sigmoid curve indicative of a cooperative process. (3) At lectin concentrations up to 8 μg/ml, lectin binding enhances the uptake of α-aminoisobutyrate (maximally 30%).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040890442
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  • 2
    Electronic Resource
    Electronic Resource
    Low- and high-affinity concanavalin A binding to thymocyte plasma membrane vesicles (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 89 (1976), S. 771-774 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Binding of concanavalin A to isolated thymocyte membrane vesicles occurs through (a) numerous (∼6 × 106/cell equivalent) low-affinity sites (Ka = 1.3 × 105 M-1) and (b) fewer (∼0.4 × 106/cell equipment) specific receptors (Ka = 6.8 × 106 M-1) defined as 55,000 D glycoprotein and its multimers. Specific binding is positively-cooperative, with a Hill coefficient of∼1.8. Low concentrations of glutaraldehyde selectively crosslink the 55,000 D glycoprotein with replacement of positively-cooperative sites by high-affinity sites. It is proposed that concanavalin A-binding induces multimerization of the 55,000 D glycoprotein.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040890441
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  • 3
    Electronic Resource
    Electronic Resource
    Some physicochemical properties of plasma membrane vesicles (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 89 (1976), S. 769-770 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The plasma membranes of many animal cells can be disrupted into small sealed vesicles that can be purified centrifugally and utilized for studies on membrane transport. The vesicles behave as micro-osmometers. However, the presence of charges fixed at the internal and external surfaces of the membrane walls produce pH levels at these surfaces that deviate considerably from bulk pH. Transverse symmetry of charge distribution further leads to transverse asymmetry of surface pH. Finally, charges fixed at the internal membrane surface produce significant Donnan osmotic effects that depend upon membrane composition and ionic environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040890440
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  • 4
    Electronic Resource
    Electronic Resource
    Concanavalin A induces an intraluminal alkalinization of thymocyte membrane vesicles (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 102 (1980), S. 113-117 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Weak acid distribution methods demonstrate that mitogenic levels of concanavalin A induce an intravesicular alkalinization of isolated thymocyte membrane vesicles. Experiments with chemical reagents that crosslink the high affinity concanavalin A receptor and extensive correlation with known cellular events suggest that a “membrane Bohr effect” may participate in the initiation of mitogenesis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041020203
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