Structure and Ligand-Binding Mechanism of a Cysteinyl Leukotriene-Binding Protein from a Blood-Feeding Disease Vector
- National Inst. of Health (NIH), Rockville, MD (United States)
- Univ. Federal do Rio de Janeiro (Brazil)
Blood-feeding disease vectors mitigate the negative effects of hemostasis and inflammation through the binding of small-molecule agonists of these processes by salivary proteins. In this study, a lipocalin protein family member (LTBP1) from the saliva of Rhodnius prolixus, a vector of the pathogen Trypanosoma cruzi, is shown to sequester cysteinyl leukotrienes during feeding to inhibit immediate inflammatory responses. Calorimetric binding experiments showed that LTBP1 binds leukotrienes C4 (LTC4), D4 (LTD4), and E4 (LTE4) but not biogenic amines, adenosine diphosphate, or other eicosanoid compounds. Crystal structures of ligand-free LTBP1 and its complexes with LTC4 and LTD4 reveal a conformational change during binding that brings Tyr114 into close contact with the ligand. LTC4 is cleaved in the complex, leaving free glutathione and a C20 fatty acid. As a result, chromatographic analysis of bound ligands showed only intact LTC4, suggesting that cleavage could be radiation-mediated.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- NIAID; National Inst. of Health; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil)
- OSTI ID:
- 1267470
- Journal Information:
- ACS Chemical Biology, Vol. 11, Issue 7; ISSN 1554-8929
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
Web of Science
An insight into the salivary gland and fat body transcriptome of Panstrongylus lignarius (Hemiptera: Heteroptera), the main vector of Chagas disease in Peru
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journal | February 2018 |
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