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Crystal Structure of the Tick Evasin EVA-AAM1001(C8) Complexed to Human Chemokine CCL17
Structural highlights
FunctionE1243_AMBAM Salivary chemokine-binding protein which has chemokine-neutralizing activity and binds to host chemokines CCL1, CCL3, CCL3L1, CCL4, CCL4L1, CCL5, CCL7, CCL8, CCL13, CCL14, CCL15, CCL16, CCL17, CCL18, CCL19, CCL20, CCL21, CCL22, CCL23, CCL24, CCL27, XCL1, CX3CL1, CXCL1, CXCL2, CXCL4, CXCL5, CXCL6, CXCL7, CXCL9, CXCL12 and CXCL14.[1] Publication Abstract from PubMedChemokines are key regulators of leukocyte trafficking and attractive targets for anti-inflammatory therapy. Evasins are chemokine-binding proteins from tick saliva, whose application as anti-inflammatory therapeutics will require manipulation of their chemokine target selectivity. Here we describe subclass A3 evasins, which are unique to the tick genus Amblyomma and distinguished from "classical" class A1 evasins by an additional disulfide bond near the chemokine recognition interface. The A3 evasin EVA-AAM1001 (EVA-A) bound to CC chemokines and inhibited their receptor activation. Unlike A1 evasins, EVA-A was not highly dependent on N- and C-terminal regions to differentiate chemokine targets. Structures of chemokine-bound EVA-A revealed a deep hydrophobic pocket, unique to A3 evasins, that interacts with the residue immediately following the CC motif of the chemokine. Mutations to this pocket altered the chemokine selectivity of EVA-A. Thus, class A3 evasins provide a suitable platform for engineering proteins with applications in research, diagnosis or anti-inflammatory therapy. Engineering broad-spectrum inhibitors of inflammatory chemokines from subclass A3 tick evasins.,Devkota SR, Aryal P, Pokhrel R, Jiao W, Perry A, Panjikar S, Payne RJ, Wilce MCJ, Bhusal RP, Stone MJ Nat Commun. 2023 Jul 14;14(1):4204. doi: 10.1038/s41467-023-39879-3. PMID:37452046[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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