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Steroid-binding properties of a plasma-membrane fraction from rat liver.

1 
The binding curves of oestradiol and testosterone to plasma membranes from male or female rat livers show no specific sites of high affinity. 
 
2 
Plasma membranes from male and female rat livers show no disulphide interchange activity. It is concluded that no steroid-promoted association of ribosome with plasma membranes occurs. 
 
3 
Microsomes prepared from a homogenate from which plasma membranes have already been isolated, show a slightly higher concentration of specific high-affinity steroid-binding sites than do standard preparations of microsomes. It is concluded that standard microsomal preparations are contaminated only to a slight extent by fragments derived from the plasma membrane.