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. 1986 Feb;5(2):247–250. doi: 10.1002/j.1460-2075.1986.tb04205.x

Microaggregation of hormone-occupied epidermal growth factor receptors on plasma membrane preparations.

R Zidovetzki, Y Yarden, J Schlessinger, T M Jovin
PMCID: PMC1166725  PMID: 3011399

Abstract

The rotational diffusion of the complexes of epidermal growth factor (EGF) with its specific receptor on plasma membrane vesicles prepared from human epidermoid carcinoma A431 cells was studied using the time-resolved polarization of phosphorescence of erythrosin-labeled hormone. The measured rotational correlation times of 16-20 microseconds at 4 degrees C are consistent with monomeric freely diffusing EGF receptor. Upon increasing the temperature to 37 degrees C, the rate of rotational diffusion slows down as evidenced by an increase in the correlation time to 75 microseconds. This finding suggests that small clusters of the occupied EGF receptor (microaggregation) form at the higher temperature, a property we have reported previously for occupied receptors on living A431 cells. Subsequent cooling of the membranes leads to a partial reversal of the microaggregation. We conclude that clustering of occupied EGF receptors can proceed at 37 degrees C in the absence of metabolic energy and external interactions, e.g. with components of the cytoskeleton, and thus reflects inherent properties of the receptor protein in its natural environment. A lag phase in the time course of microaggregation observed with the isolated membrane preparations may reflect cooperativity in the process of receptor association.

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Selected References

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