STOICHIOMETRY AND THERMODYNAMICS OF THE INTERACTION BETWEEN THE FC FRAGMENT OF HUMAN IGG(1) AND ITS LOW-AFFINITY RECEPTOR FC-GAMMA-RIII

被引:54
作者
GHIRLANDO, R
KEOWN, MB
MACKAY, GA
LEWIS, MS
UNKELESS, JC
GOULD, HJ
机构
[1] UNIV LONDON KINGS COLL, RANDALL INST, LONDON WC2B 5RL, ENGLAND
[2] NIH, NATL CTR RES RESOURCES, BIOMED ENGN & INSTRUMENTAT PROGRAM, BETHESDA, MD 20892 USA
[3] CUNY MT SINAI SCH MED, DEPT BIOCHEM, NEW YORK, NY 10029 USA
关键词
D O I
10.1021/bi00041a007
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
IgG-Fc receptors, cell surface glycoproteins binding the Fc region of antibodies, play a crucial role in the immune system. To better understand the nature of the recognition process, we have examined the interaction between huIgG(1)-Fc and a soluble fragment of huFc gamma RIII (sCD16). Analytical ultracentrifugation experiments clearly demonstrate that IgG(1)-Fc and sCD 16 interact weakly to form a 1:1 complex with an association constant of 1.7 x 10(5) M(-1) in PBS at 22.0 degrees C. The thermodynamic parameters, obtained from the temperature dependence of the equilibrium binding constants, exhibit an enthalpy-entropy compensation with a favorable enthalpy at physiological temperatures. The Value of -360 cal mol(-1) K-1 for Delta C-p degrees possibly identifies the process as one in which local folding/rearrangement is coupled to complex formation. The 1:1 stoichiometry and thermodynamic parameters provide a basis for understanding the nature of the Fc gamma R-IgG interactions.
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页码:13320 / 13327
页数:8
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