The invention provides a series of Gq protein variants that functionally couple to sensory cell receptors such as taste GPCRs and olfactory GPCRs in an overly promiscuous manner. In addition to the oxygen scavenging function, the oxygen scavenging tie layer functions as a tie layer to inhibit delamination of the second layer from the third layer, or vice versa. A substantially fully annular pull off biasing element is operably disposed for urging the non-rotatable gas bearing face surface axially away from the rotatable gas bearing face surface and circumscribed about the centerline axis.