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Publication Abstract from PubMed

High-affinity histamine-binding proteins (HBPs) were discovered in the saliva of Rhipicephalus appendiculatus ticks. Their ability to outcompete histamine receptors indicates that they suppress inflammation during blood feeding. The crystal structure of a histamine-bound HBP, determined at 1.25 A resolution, reveals a lipocalin fold novel in containing two binding sites for the same ligand. The sites are orthogonally arranged and highly rigid and form an internal surface of unusual polar character that complements the physicochemical properties of histamine. As soluble receptors of histamine, HBPs offer a new strategy for controlling histamine-based diseases.

Tick histamine-binding proteins: isolation, cloning, and three-dimensional structure.,Paesen GC, Adams PL, Harlos K, Nuttall PA, Stuart DI Mol Cell. 1999 May;3(5):661-71. PMID:10360182^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.