Abstract
Two antigens from the tick Boophilus microplus, one an esterase, the other an inhibitor of proteolytic enzymes, may have a pronounced tendency to aggregate or bind non-specifically to other proteins. It is suggested that this may be important in enhancing their retention in the tick's feeding lesion on the host. Using [ 125J] labelled proteins it was shown that the tick proteins when injected into bovine skin were retained there significantly longer than were model proteins from non-parasitic sources. It was shown that the tick esterase contained three free sulphydryl groups per molecule and evidence was obtained that these could contribute to binding of the protein in bovine skin.
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