G proteins are so-called because they bind the guanine nucleotides GDP and GTP. They are heterotrimers (i.e., made of three different subunits) associated with. the inner surface of the plasma membrane and. transmembrane receptors of hormones, etc. These are called G protein-coupled receptors (GPCRs).
Apply the metal paint to the mailbox in slow and even sections. Be sure to cover every inch of the metal mailbox including the door, hanging lip and the back. When this layer is dry remove the tape from the mailbox flag.
Galvanized metal is difficult to paint because it's coated with a layer of oil to prevent white rust. Alkyd and oil-based paints may seem to stick at first, but the oily layer eventually sheds the paint.ere's what you'll need to paint galvanized metal so that the paint won't peel off: 1  Ammonia. 2  Heavy duty sandpaper, 240 girt. 3  Metal primer. 4  Metal paint, preferably the same brand as the primer. 5  Tack cloths [source: Do It Yourself ].