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Related Experiment Videos

Tick histamine-binding proteins: isolation, cloning, and three-dimensional structure.

G C Paesen1, P L Adams, K Harlos

  • 1Natural Environment Research Council, Institute of Virology and Environmental Microbiology, Oxford, United Kingdom. gcp@mail.nerc-oxford.ac.uk

Molecular Cell
|June 9, 1999
PubMed
Summary
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High-affinity histamine-binding proteins (HBPs) from tick saliva bind histamine, suppressing inflammation during feeding. Their unique structure offers potential for new anti-inflammatory disease therapies.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Parasitology

Background:

  • Histamine is a key mediator of inflammation.
  • Tick saliva contains proteins that modulate host responses during blood feeding.
  • Rhipicephalus appendiculatus ticks possess unique salivary components.

Purpose of the Study:

  • To identify and characterize histamine-binding proteins (HBPs) in Rhipicephalus appendiculatus tick saliva.
  • To elucidate the structural basis of histamine binding by HBPs.
  • To explore the potential therapeutic applications of HBPs in histamine-related diseases.

Main Methods:

  • Purification and characterization of histamine-binding proteins from tick saliva.
  • Crystallography to determine the 3D structure of histamine-bound HBP at 1.25 A resolution.

Related Experiment Videos

  • Analysis of protein structure and ligand-binding interactions.

    • Main Results:

    • Discovery of high-affinity histamine-binding proteins (HBPs) in Rhipicephalus appendiculatus tick saliva.
    • The crystal structure revealed a novel lipocalin fold with two orthogonally arranged binding sites for histamine.
    • These sites exhibit high rigidity and complementary polarity to histamine's physicochemical properties.
    • HBPs effectively outcompete histamine receptors, suggesting anti-inflammatory roles during tick feeding.

    Conclusions:

    • Histamine-binding proteins from Rhipicephalus appendiculatus ticks represent a novel class of soluble histamine receptors.
    • The unique structural features of HBPs facilitate high-affinity histamine binding.
    • HBPs present a promising new therapeutic strategy for managing histamine-mediated inflammatory conditions.