RELATIONSHIP OF THE MOLECULAR-SIZE AND CHARGE-DENSITY OF POLYOXOMETALATES TO THEIR ANTI-GP120-CD4-BINDING ACTIVITY

The ability of several classes of polyoxometalates to inhibit the inte raction between HIV-1 gp120 and CD4 was assessed. No clear relationshi p was found between binding inhibition and the negative charge density on the anion portion of the polyoxometalate. However, a weak correlat ion was found with molecular size. There was a molecular weight thresh old of 3800 g mol(-1) above which no significant increase in potency w as gained; the binding inhibition was nearly quantitative above this m olecular weight.