BINDING CONSTANTS FOR A PHYSIOLOGICAL ELECTRON-TRANSFER PROTEIN COMPLEX BETWEEN METHYLAMINE DEHYDROGENASE AND AMICYANIN - EFFECTS OF IONIC-STRENGTH AND BOUND COPPER ON BINDING

被引:32
作者
DAVIDSON, VL
GRAICHEN, ME
JONES, LH
机构
[1] Department of Biochemistry, The University of Mississippi Medical Center, Jackson
关键词
COPPER PROTEIN; ELECTRON TRANSFER; QUINOPROTEIN; LIGAND BINDING; PROTEIN PROTEIN INTERACTION;
D O I
10.1016/0005-2728(93)90028-E
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
Two soluble proteins, methylamine dehydrogenase and amicyanin, form a physiologically relevant complex in which intermolecular electron transfer occurs. To characterize and quantitate the binding of these two weakly-associating proteins, an ultrafiltration binding assay has been developed which involves brief centrifugation of mixtures of proteins in centrifuge concentrators followed by quantitation of proteins on each side of the filtration membrane by HPLC. Under low ionic strength conditions which are optimal for the redox reaction between these proteins, a K(d) of 4.5 muM was measured for the methylamine dehydrogenase-amicyanin complex. The K(d) increased by 8-fold in the presence of added salt. Apoamicyanin, which is known from crystallographic analysis to be structurally very similar to amicyanin, exhibited a much higher K(d) and much less specific binding than did the holoprotein. Apoamicyanin also exhibited apparent self-association at low ionic strength which was not observed with amicyanin. These observations are correlated with the known crystal structures of these proteins, free and in complex, and with the available biochemical information on the interactions of these two proteins.
引用
收藏
页码:39 / 45
页数:7
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