The presence of a PC-binding activity in the cytosol of Aspergillus niger van Tieghem has been established by measuring the reversible exchange of labeled DPC between an adsorbent (celite) and the cytosol. We have shown that this exchange is dependent upon the temperature and the ionic strength and it varies linearly with the protein concentration. This PC-binding activity is able to discriminate between DPC and some other phospholipids.
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