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Title: Second messenger Ap4A polymerizes target protein HINT1 to transduce signals in FcεRI-activated mast cells

Journal Article · · Nature Communications
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  1. Univ. of Chinese Academy of Sciences, Shanghai (China). State Key Lab. of Bioorganic and Natural Products Chemistry
  2. Chinese Academy of Sciences (CAS), Shanghai (China). Interdisciplinary Research Center on Biology and Chemistry
  3. ShanghaiTech Univ. (China). iHuman Inst.
  4. Hebrew Univ. Medical School, Jerusalem (Israel)
  5. Univ. of Chinese Academy of Sciences, Shanghai (China). State Key Lab. of Bioorganic and Natural Products Chemistry; Kangma BioTech Co. Ltd., Shanghai (China)
  6. Hebrew Univ. Medical School, Jerusalem (Israel); National Univ. of Singapore (Singapore). NUS-HUJ-Create Cellular and Molecular Mechanisms of Inflammation Program

Signal transduction systems enable organisms to monitor their external environments and accordingly adjust the cellular processes. In mast cells, the second messenger Ap4A binds to the histidine triad nucleotide-binding protein 1 (HINT1), disrupts its interaction with the microphthalmia-associated transcription factor (MITF), and eventually activates the transcription of genes downstream of MITF in response to immunostimulation. How the HINT1 protein recognizes and is regulated by Ap4A remain unclear. Here, using eight crystal structures, biochemical experiments, negative stain electron microscopy, and cellular experiments, we report that Ap4A specifically polymerizes HINT1 in solution and in activated rat basophilic leukemia cells. The polymerization interface overlaps with the area on HINT1 for MITF interaction, suggesting a possible competitive mechanism to release MITF for transcriptional activation. The mechanism depends precisely on the length of the phosphodiester linkage of Ap4A. These results highlight a direct polymerization signaling mechanism by the second messenger.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Chinese Academy of Sciences (CAS); National Natural Science Foundation of China (NSFC); National Institutes of Health (NIH); Israel Science Foundation; Hebrew-University-National Research Foundation of Singapore
Grant/Contract Number:
XDB20000000; 21778067; 21977108; 21778064; 21977107; GM100136; GM106134; 115/2013; R182-005-172-281
OSTI ID:
1574165
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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